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RayPals df99608491 port: record MSVC6 frontier through md5module

2026-09-19 18:28:14 +00:00

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Port Status — CPython 3.11.16 to Windows 98 SE

Latest revision (`mathmodule.c` `perm_comb_small` `fast_comb_limits2` C89 declaration-order slice)

Date: 2026-09-19 18:22 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. PORT_STATUS.md, README.md, and references/python-3-win9x-msvc6.md were read before changes. The nested cpython/ checkout remains detached with all pre-existing local port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was force-re-probed first and remained applicable: 34 sources compiled and mathmodule.c was first. The first stable blocker was the C89 declaration-order defect at mathmodule.c(3528)–(3532): fast_comb_limits2 was declared after executable statements in perm_comb_small(). One focused coding-agent delegation was attempted; the Hermes delegation path failed because the runtime lacks the anthropic package. A direct Codex coding lane then added the focused regression assertion and ran the required red test, but stopped for confirmation because the array is static const; the minimal source edit was completed without broadening scope. No commits, pushes, or publication occurred.

This slice changed only:

cpython/Modules/mathmodule.c — moved the complete static const fast_comb_limits2[] initializer into perm_comb_small()'s opening declaration group and removed the later declaration. The array contents, lookup, and control flow are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused structural assertion.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

|| Command | Result | ||---|---| || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh before this slice | exit 2; 34 sources compiled; first stable blocker mathmodule.c(3528) C2143 and (3532) C2065/C2109 for fast_comb_limits2; later diagnostics began at (3605); summary total=35 compiled=34 cached=0 skipped=0. | || Hermes focused delegation | failed before launch: The 'anthropic' package is required for the Anthropic provider; no child files were used. | || direct codex exec -s workspace-write --skip-git-repo-check ... | exit 0; added the focused assertion and ran it red with the expected fast_comb_limits2 missing-declaration assertion; source remained unchanged when the lane stopped for confirmation. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after source edit | exit 0; ALL TESTS PASSED, including perm_comb_small uses a C89 declaration-order-safe fast_comb_limits2 array. | || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh after source edit | exit 2; mathmodule.c compiled past this family. Next first stable blocker is md5module.c(36) C2632 for long long, followed by a designated initializer at (498) and declaration-order errors at (527); summary total=36 compiled=35 cached=0 skipped=0. Existing warnings remain mathmodule.c(1336) C4113/C4133, arraymodule.c(2247) C4761, audioop.c(1536)/(1609) C4761, and faulthandler.c(542) C4047. | || full applicable regression command (bash -n plus public/core/PathCch/getpath/stdint/frontier suites) | exit 0; all suites passed and the focused frontier suite ended with ALL TESTS PASSED. | || git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch; cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch | exit 0; regenerated patch matches the complete nested source diff byte-for-byte. git -C cpython diff --check also exited 0. |

Current compile-frontier state: perm_comb_small() now compiles through its fast_comb_limits2 C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is md5module.c(36), beginning with the distinct VC6 long long family. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c` `_check_long_mult_overflow` C89 declaration-order slice)

Date: 2026-09-19 16:11 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. Before changing anything, PORT_STATUS.md, README.md, and references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains external/local-only through Wine using WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded math_isqrt() frontier was force-re-probed first and remained applicable: 34 sources compiled and mathmodule.c remained first. The first stable blocker was the distinct C89 declaration-order family in _check_long_mult_overflow() at lines 3186–3190. One focused Codex coding-agent delegation ran in the existing checkout with the requested scope, preserved local changes, and did not commit, push, or publish. The child added the focused assertion and implementation; no independent review is claimed.

This slice changed only the following:

cpython/Modules/mathmodule.c — hoisted diff, absdiff, and absprod into _check_long_mult_overflow()'s opening declaration group and changed their original initializers to assignments at the same evaluation point. Overflow comparison and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused assertion for the opening declarations, assignment order, and unchanged return logic.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 34 sources compiled; first stable blocker `mathmodule.c(3186)`–`(3190)` C2143/C2065 for the three post-statement `const double` declarations; later blockers at `(3525)` and `(3602)`; summary `total=35 compiled=34 cached=0 skipped=0`.
`codex exec -s workspace-write --skip-git-repo-check ...`	exit 0; focused implementation completed in the existing checkout; no commit, push, or publish.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after implementation	exit 0; `ALL TESTS PASSED`, including `_check_long_mult_overflow uses opening C89 declarations and original-point assignments`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after this slice	exit 2; `_check_long_mult_overflow()` compiled past this family. Next first stable blocker is the distinct declaration-order family at `mathmodule.c(3528)`–`(3532)` involving `fast_comb_limits2`; later diagnostics remain at `(3605)` onward. Summary `total=35 compiled=34 cached=0`. Existing warnings include `mathmodule.c(1336)` C4113/C4133, `arraymodule.c(2247)` C4761, `audioop.c(1536)`/`(1609)` C4761, and `faulthandler.c(542)` C4047.
`bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all applicable regression suites and shell syntax checks passed.
`git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested source diff.

Current compile-frontier state: _check_long_mult_overflow() now compiles through its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is mathmodule.c(3528)–(3532), the fast_comb_limits2 declaration-order family. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c` `math_isqrt` C89 loop-counter slice)

Date: 2026-09-19 14:02 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. Before changes, PORT_STATUS.md, README.md, and references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified compiler remains MSVC6 12.00.8804 through Wine using WINEPREFIX=/home/ubuntu/.wine-win9xport.

The recorded _blake2/blake2s_impl.c sequence was force-re-probed first and remained applicable: 34 sources compiled and mathmodule.c remained first. The first stable blocker was the distinct C99 loop-counter declaration at mathmodule.c(1945). One focused Codex coding-agent delegation ran in the existing checkout with the requested scope, preserved local changes, implemented only this slice, and did not commit, push, or publish. The child reported the required red-then-green focused TDD cycle; independent verification below confirms the green result. No independent review is claimed.

This slice changed only the following:

cpython/Modules/mathmodule.c — added int s to math_isqrt()'s opening declaration group and changed for (int s = ...) to for (s = ...); loop behavior is unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused assertion for the C89-safe math_isqrt() loop counter.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

|| Command | Result | |---|---| | VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh before this slice | exit 2; 34 sources compiled; first stable blocker mathmodule.c(1945) C2143/C2065/C2059/C2143 for the C99 for (int s = ...); later blockers at (3185), (3524), and (3601); summary total=35 compiled=34 cached=0. | | focused Codex delegation: codex exec -s workspace-write --skip-git-repo-check ... | exit 0; child performed the requested focused TDD implementation, with no commit/push/publish. | | bash scripts/vc6-probe-pythoncore-frontier.test.sh after implementation | exit 0; ALL TESTS PASSED, including math_isqrt uses an opening C89 loop counter declaration. | | VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh after this slice | exit 2; mathmodule.c compiled past line 1945. Next first stable blocker is the distinct declaration-order family at (3186)–(3190) (perm_comb_small()); later blockers are (3525) and (3602). Summary total=35 compiled=34 cached=0. Existing warnings remain mathmodule.c(1336), arraymodule.c(2247), audioop.c(1536), (1609), and faulthandler.c(542). | | bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh | exit 0; all applicable regression suites and shell syntax checks passed. | | git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch | exit 0; patch exactly matches the complete nested source diff. |

Current compile-frontier state: math_isqrt() now compiles through its C89 loop-counter family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is perm_comb_small() at mathmodule.c(3186)–(3190). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c guarded VC6` expm1` fallback slice)

Date: 2026-09-19 11:54 UTC

The recorded _blake2/blake2s_impl.c sequence was force-re-probed first and remained applicable: 34 sources compiled and mathmodule.c remained first. The first stable blocker was the distinct missing-VC6-CRT expm1 family at line 1350. One focused coding-agent delegation was attempted as required but failed before launch because the runtime lacks the anthropic package; no child files were used and no independent review is claimed. This slice addressed only expm1; later declaration-order blockers remain untouched.

cpython/Modules/mathmodule.c — added an _MSC_VER < 1300-guarded m_expm1() fallback using a small-input quadratic approximation and exp(x) - 1.0; routed only FUNC1(expm1, ...) through it. Native compilers retain the CRT path through #define m_expm1 expm1.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the guarded fallback, small-input handling, native mapping, and routing.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 34 sources compiled; first stable blocker `mathmodule.c(1350)` C2065 for unavailable `expm1`; later declaration-order blockers at `(1936)`, `(3176)`, `(3515)`, and `(3592)`; summary `total=35 compiled=34 cached=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `VC6 m_expm1 fallback missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `mathmodule.c` compiled past `expm1`; next first stable blocker is the distinct declaration-order family at `(1945)`, with later families at `(3185)`, `(3524)`, and `(3601)`; summary `total=35 compiled=34 cached=0`. Existing warnings remain `mathmodule.c(1336)`, `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`.
`bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all applicable regression suites and shell syntax checks passed.
`git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch exactly matches the complete nested source diff.

Current compile-frontier state: expm1 now compiles through the guarded VC6 fallback under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the declaration-order family in mathmodule.c at line 1945. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c` guarded VC6 `exp2` fallback slice)

Date: 2026-09-19 09:46 UTC

The recorded _blake2/blake2s_impl.c sequence was force-re-probed first and remained applicable: 34 sources compiled and mathmodule.c remained first. The first stable blocker was the distinct missing-VC6-CRT exp2 family at line 1336. One focused coding-agent delegation was attempted as required but failed before launch because the runtime lacks the anthropic package; no child files were used and no independent review is claimed. This slice addressed only exp2; expm1 and later declaration-order blockers remain untouched.

cpython/Modules/mathmodule.c — added an _MSC_VER < 1300-guarded m_exp2() fallback using exp(x * log(2.0)) with NaN preservation; routed only FUNC1(exp2, ...) through it. Native compilers retain the CRT path through #define m_exp2 exp2.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the guarded fallback, NaN handling, native mapping, and routing.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 34 sources compiled; first stable blocker `mathmodule.c(1336)` C2065 for unavailable `exp2`; `expm1` followed at `(1341)`; summary `total=35 compiled=34 cached=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `VC6 m_exp2 fallback missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `mathmodule.c` compiled past `exp2`; next first stable blocker is unavailable `expm1` at `(1350)`, followed by distinct declaration-order blockers at `(1936)`, `(3176)`, `(3515)`, and `(3592)`; summary `total=35 compiled=34 cached=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`.
`bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all applicable regression suites and shell syntax checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch exactly matches the complete nested source diff.

Current compile-frontier state: exp2 now compiles through the guarded VC6 fallback under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the missing-CRT expm1 family at mathmodule.c(1350). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c` `math_ceil` C89 declaration-order slice)

Date: 2026-09-19 06:00 UTC

The recorded _blake2/blake2s_impl.c sequence was force-re-probed first and remained applicable: 34 sources compiled and mathmodule.c remained first. The first stable blocker was the distinct C89 declaration-order defect in math_ceil() at line 1306. One focused Codex coding-agent delegation was run in workspace-write mode with the existing checkout; it preserved local changes, implemented only this slice, and did not commit, push, or publish. This slice addressed only math_ceil(); later copysign, exp2, expm1, and other mathmodule blockers remain untouched.

cpython/Modules/mathmodule.c — hoisted double x into math_ceil()'s opening declaration group and changed its initializer to an assignment at the original evaluation point. Lookup, conversion, error handling, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the opening declaration and original-point assignment.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 34 sources compiled; first stable blocker `mathmodule.c(1306)` C2143/C2065 for `double x`; later distinct blockers at `(1317)`, `(1335)`, `(1340)`, `(1926)`, `(3166)`, `(3505)`, and `(3582)`; summary `total=35 compiled=34 cached=0`.
`codex exec -s workspace-write --skip-git-repo-check ...`	exit 0; focused TDD implementation completed; the child reported the expected red assertion before the source edit and green focused test afterward; no commit/push/publish.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the slice	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the slice	exit 2; `math_ceil()` compiled past this family. The next first stable blocker is unavailable VC6 CRT `exp2` at `mathmodule.c(1336)`; `expm1` follows at `(1341)`, with later distinct declaration-order blockers. Summary `total=35 compiled=34 cached=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all applicable regression suites and shell syntax checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check && cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch exactly matches the complete nested source diff.

Current compile-frontier state: math_ceil() now compiles through its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the missing-CRT exp2 family at mathmodule.c(1336). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c` guarded VC6 `cbrt` fallback slice)

Date: 2026-09-19 05:29 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified MSVC6 banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86 through Wine using WINEPREFIX=/home/ubuntu/.wine-win9xport. PORT_STATUS.md, README.md, and references/python-3-win9x-msvc6.md were read before changes.

The recorded _blake2/blake2s_impl.c sequence was force-re-probed first and remained applicable: 34 sources compiled and mathmodule.c was first. The first stable blocker was unavailable VC6 CRT cbrt at the prior line 1259. One focused coding-agent delegation was attempted for implementation but failed before launch because the runtime lacks the anthropic package; no child files were used and no independent review is claimed. This slice addressed only cbrt.

cpython/Modules/mathmodule.c — added an _MSC_VER < 1300-guarded m_cbrt() using fabs/log/exp, preserving NaN, signed zero, infinity, and sign handling; routed only FUNC1(cbrt, ...) through it. Native compilers retain the CRT path through #define m_cbrt cbrt.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the guarded fallback, special-value handling, native mapping, and routing.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 34 sources compiled; first stable diagnostic `mathmodule.c(1259)` C2065 for unavailable `cbrt`, followed by distinct declaration-order and `exp2`/`expm1` blockers; summary `total=35 compiled=34 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `VC6 m_cbrt fallback missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `mathmodule.c` compiled past `cbrt`; next first stable blocker is `math_ceil()`'s post-statement `double x` declaration at `(1306)`, followed by distinct blockers at `(1317)`, `(1335)`, `(1340)`, `(1926)`, `(3166)`, `(3505)`, and `(3582)`; summary `total=35 compiled=34 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`.
`bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites	exit 0; all applicable suites passed and the focused frontier suite ended with `ALL TESTS PASSED`.
`git -C cpython diff --check`; patch regeneration plus `cmp -s` verification	exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff.

Current compile-frontier state: cbrt now compiles through the guarded VC6 fallback under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct C89 declaration-order blocker in math_ceil() at mathmodule.c(1306). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c` guarded VC6 `atanh` fallback slice)

Date: 2026-09-19 03:21 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. Before changing anything, PORT_STATUS.md, README.md, and references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified MSVC6 banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86 through Wine using WINEPREFIX=/home/ubuntu/.wine-win9xport.

The recorded frontier was force-re-probed first and remained applicable: _blake2/blake2s_impl.c compiled, 34 sources compiled, and mathmodule.c remained first. The first stable blocker was the distinct missing-VC6-CRT math-function family: atanh at line 1233 before this slice, followed by cbrt at line 1236 and later declaration-order families. One focused read-only Codex coding-agent delegation inspected this exact frontier, made no edits, and recommended the isolated m_atanh fallback. No independent implementation review is claimed beyond that advisory inspection.

This run addressed only atanh:

cpython/Modules/mathmodule.c — added an _MSC_VER < 1300-guarded m_atanh() using the stable logarithmic formulation with small-input preservation, signed-zero/NaN handling, and EDOM for abs(x) >= 1; routed only FUNC1(atanh, ...) through it. Native compilers retain the CRT atanh path through #define m_atanh atanh.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the guarded fallback, native mapping, domain handling, and routing.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 34 sources compiled; first stable diagnostics `mathmodule.c(1233)` C2065 for `atanh`, then `cbrt` at `(1236)` and later distinct declaration-order blockers; summary `total=35 compiled=34 cached=0 skipped=0`.
focused read-only `codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended only the guarded `m_atanh` fallback and `FUNC1(atanh, m_atanh, 0, ...)`; no files changed, no broad build run.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `VC6 m_atanh fallback missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `mathmodule.c` compiled past `atanh`; next first stable blocker is unavailable `cbrt` at `(1259)`; later distinct blockers remain at `(1288)`, `(1908)`, `(3148)`, `(3487)`, and `(3564)`; summary `total=35 compiled=34 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`.
`bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites	exit 0; all applicable suites passed and the focused frontier suite ended with `ALL TESTS PASSED`.
`git -C cpython diff --check`; patch regeneration plus `cmp -s` verification	exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff.

Current compile-frontier state: atanh now compiles through the guarded VC6 fallback under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the remaining missing-CRT cbrt family at mathmodule.c(1259); exp2 and expm1 remain distinct later blockers. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c` guarded VC6 `asinh` fallback slice)

Date: 2026-09-19 01:12 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. Before changing anything, PORT_STATUS.md, README.md, and references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified MSVC6 banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86 through Wine using WINEPREFIX=/home/ubuntu/.wine-win9xport.

The recorded frontier was force-re-probed first and remained applicable: _blake2/blake2s_impl.c compiled, 34 sources compiled, and mathmodule.c remained first. The first stable blocker was the distinct missing-VC6-CRT math-function family, with asinh first at line 1212 before this slice. One focused coding-agent delegation was attempted for advisory inspection but failed before launch because the runtime lacks the anthropic package; no child files were used and no independent review is claimed. This run addressed only asinh; atanh, cbrt, exp2, expm1, and later declaration-order blockers remain untouched.

cpython/Modules/mathmodule.c — added an _MSC_VER < 1300-guarded m_asinh() implementation using sign symmetry, a large-argument overflow-safe branch, and the standard logarithmic form; routed only FUNC1(asinh, ...) through it. Native CRT paths and later math functions remain unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the guarded fallback and explicit m_asinh routing.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 34 sources compiled; first stable diagnostics `mathmodule.c(1212)` C2065 for `asinh`, followed by `atanh` at `(1223)`, `cbrt` at `(1226)`, and later distinct families; summary `total=35 compiled=34 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `VC6 m_asinh fallback missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `mathmodule.c` compiled past `asinh`; next first stable blockers are unavailable `atanh` at `(1233)` and `cbrt` at `(1236)`; summary `total=35 compiled=34 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`.
`bash -n` plus public/core/PathCch/getpath/stdint/frontier regression suites	exit 0; all applicable suites passed and the focused frontier suite ended with `ALL TESTS PASSED`.
`git -C cpython diff --check`; patch regeneration plus `cmp -s` verification	exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff.

Current compile-frontier state: asinh now compiles through the guarded VC6 fallback under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the remaining missing-CRT math family beginning with atanh; cbrt, exp2, and expm1 remain distinct later blockers. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c` guarded VC6 `acosh` fallback slice)

Date: 2026-09-18 23:05 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. Before changing anything, PORT_STATUS.md, README.md, and references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified MSVC6 banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86 through Wine using WINEPREFIX=/home/ubuntu/.wine-win9xport.

The recorded frontier was force-re-probed first and remained applicable: _blake2/blake2s_impl.c compiled, 34 sources compiled, and mathmodule.c remained first. The first stable blocker was the distinct missing-VC6-CRT math-function family; acosh was the first error at line 1192 in the prior probe. One focused read-only Codex coding-agent delegation inspected this exact family, made no edits, and recommended a single guarded m_acosh fallback while leaving asinh, atanh, and cbrt for later slices. This run addressed only acosh.

cpython/Modules/mathmodule.c — added an _MSC_VER < 1300-guarded m_acosh() implementation with domain-error handling and overflow-safe large-argument branch; routed only FUNC1(acosh, ...) through it. The native CRT paths and the later missing functions remain untouched.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the guarded fallback and explicit m_acosh routing.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 34 sources compiled; first blocker `mathmodule.c(1192)` C2065 for `acosh`, with later `asinh`, `atanh`, `cbrt`, `exp2`, `expm1`, and distinct declaration-order blockers; summary `total=35 compiled=34 cached=0 skipped=0`.
focused read-only `codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended only a guarded `m_acosh` fallback and `FUNC1(acosh, m_acosh, 0, ...)`; no files changed and no build run by the child.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `VC6 m_acosh fallback missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `mathmodule.c` compiled past `acosh`; next first stable blockers are `asinh` at line 1212, `atanh` at 1223, and `cbrt` at 1226; summary `total=35 compiled=34 cached=0 skipped=0`.
`bash -n` plus public/core/PathCch/getpath/stdint regression suites	exit 0; all applicable suites passed.
`git -C cpython diff --check`; patch regeneration plus `cmp -s` verification	exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff.

Current compile-frontier state: acosh now compiles through the guarded VC6 fallback under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the remaining missing-CRT math family beginning with asinh; atanh, cbrt, exp2, and expm1 remain distinct later blockers. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c` `math_lcm` C89 declaration-order slice)

Date: 2026-09-18 20:56 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. Before changing anything, this file, README.md, and references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The verified MSVC6 compiler remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86 through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport.

The recorded frontier was force-re-probed first and remained applicable: 34 sources compiled and mathmodule.c remained first. The first stable blocker was math_lcm()'s post-statement borrowed zero declaration at line 946. One focused read-only Codex delegation inspected this exact function, made no edits, and recommended hoisting only zero while preserving the assignment point. This slice addressed only that C89 declaration-order family; mathmodule.c's later distinct blockers remain untouched.

cpython/Modules/mathmodule.c — added zero to math_lcm()'s opening declaration group and changed its later declaration initializer to an assignment at the original point. Borrowed-reference ownership and loop behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the declaration, assignment, and borrowed-reference shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 34 sources compiled; first stable blocker `mathmodule.c(946)` C2275/C2065 for `PyObject *zero`, followed by distinct blockers at `(1192)`, `(1242)`, `(1862)`, `(3102)`, `(3441)`, and `(3518)`; summary `total=35 compiled=34 cached=0 skipped=0`.
focused read-only `codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended moving `zero` into `PyObject res, x, *zero;` and assigning `zero = _PyLong_GetZero();`; no files changed and no build run by the child.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `math_lcm zero declaration missing from opening group`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `math_lcm()` compiled past this defect family. The next first stable blocker is `mathmodule.c(1192)` C2065 for unavailable `acosh`; summary `total=35 compiled=34 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`.
`bash -n` on frontier scripts plus public/core/PathCch/getpath/stdint regression suites	exit 0; all applicable suites passed.
`git -C cpython diff --check`; patch regeneration plus `cmp -s` verification	exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff.

Current compile-frontier state: math_lcm() now compiles past its borrowed-local C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct mathmodule.c(1192) missing-acosh family. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`mathmodule.c` `math_gcd` C89 declaration-order slice)

Date: 2026-09-18 18:48 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded _blake2/blake2s_impl.c sequence was force-re-probed first, but the recorded itertoolsmodule.c frontier was no longer current: the actual first stable blocker was mathmodule.c. The first defect family was math_gcd()'s post-statement borrowed singleton declaration at line 871. One focused read-only Codex delegation inspected this exact function, made no edits, and recommended hoisting only one while preserving the assignment point. This slice addressed only that C89 declaration-order family.

cpython/Modules/mathmodule.c — added one to math_gcd()'s opening declaration group and changed its later declaration initializer to an assignment at the original point. Borrowed-reference handling, early returns, and loop behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the declaration and assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 34 sources compiled; first stable blocker `mathmodule.c(871)` C2275/C2065 for `PyObject *one`, followed by distinct blockers at `(946)`, `(1192)`, `(1242)`, `(1862)`, `(3102)`, `(3441)`, and `(3518)`; summary `total=35 compiled=34 cached=0 skipped=0`.
focused read-only `codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended moving `one` into `PyObject res, x, *one;` and assigning `one = _PyLong_GetOne();`; no files changed and no build run by the child.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `math_gcd one declaration missing from opening group`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `math_gcd()` compiled past this defect family. The next first stable blocker is `mathmodule.c(946)` C2275/C2065 for `math_lcm()`'s distinct post-statement `zero` declaration; summary `total=35 compiled=34 cached=0 skipped=0`. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`.
`bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh`, public/core/PathCch/getpath/stdint/frontier regression suites, `git -C cpython diff --check`, and patch `cmp -s` verification	exit 0; all applicable checks passed and the compatibility patch exactly matches the complete nested source diff.

Current compile-frontier state: math_gcd() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is math_lcm() at mathmodule.c(946), beginning with its distinct borrowed zero declaration. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`gcmodule.c` duplicate declaration slice)

Date: 2026-09-18 16:40 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded _blake2/blake2s_impl.c sequence was force-re-probed first and remained applicable: 30 sources compiled, including faulthandler.c and gcmodule.c. The first stable gcmodule.c diagnostic was a duplicate PyGC_Head *gc, *next declaration in clear_unreachable_mask() at lines 707 and 711. A focused coding-agent delegation was attempted for advisory inspection but failed before launch because the runtime lacks the anthropic package; no child files were used and no independent review is claimed. This slice addressed only that duplicate-declaration family.

cpython/Modules/gcmodule.c — removed the second, redundant PyGC_Head *gc, *next declaration from clear_unreachable_mask(). The declaration group and control flow are otherwise unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring exactly one declaration of the local pair.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; summary `total=31 compiled=30 cached=0 skipped=0`; first stable diagnostics were `gcmodule.c(711)` C2143, followed by distinct diagnostics at `(1065)`, `(1180)`, and `(1293)`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `clear_unreachable_mask duplicate local declaration`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `gcmodule.c` compiled past the duplicate declaration. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, `(1609)`, and `faulthandler.c(542)`. The next first stable blocker is `cpython/Modules/itertoolsmodule.c`, with C2275/C2065 at line 883 and C2143/C2065/C2059 loop-declaration diagnostics at line 4878; summary `total=33 compiled=32 cached=0 skipped=0`.
full applicable regression suites and shell syntax checks	exit 0; public/core/PathCch/getpath/stdint/frontier suites all passed.
`git -C cpython diff --check`; patch regeneration plus `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; nested source diff is clean and the compatibility patch exactly matches the complete nested diff.

Current compile-frontier state: gcmodule.c now compiles past its duplicate-local declaration family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is itertoolsmodule.c at line 883, beginning with its post-statement PyObject *dataobj declaration; the later C99 loop family at line 4878 is distinct. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`faulthandler.c` VC6 declaration/API compatibility slices)

Date: 2026-09-18 16:03 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport.

This continuation cleared the remaining reported faulthandler.c compile errors without changing its core control flow:

Converted Windows exception-handler, traceback, disable-loop, and SIGFPE locals to VC6/C89 declaration order.
Guarded abort behavior flags unavailable in the MSVC6 CRT.
Replaced the Py_FatalError use that expands through unsupported __func__ with an explicit _Py_FatalErrorFunc call.
Replaced the faulthandler module's designated initializer with positional fields.
Hoisted faulthandler_init_enable() locals.

Exact verified result:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh`	exit 2; summary `total=31 compiled=30 cached=0 skipped=0`
Current first blocker	`cpython/Modules/gcmodule.c`

The next file contains many independent C89 declaration-order and control-flow failures, including errors around lines 1456, 1530, 1600, 1681, 1686, and 1714. No speculative broad edit was made.

This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetime_exec`, datetime module definition, and errno VC6 slice)

Date: 2026-09-18 15:44 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport.

This slice advanced the real pythoncore compile frontier from 27 to 29 compiled sources. It addressed only bounded VC6 compatibility families:

cpython/Modules/_datetimemodule.c: hoisted all _datetime_exec() locals before executable statements, preserved initializer/evaluation order, and replaced the module definition's C99 designated initializer with declared-order positional fields.
cpython/Modules/errnomodule.c: converted _add_errcode() and errno_exec() mixed declarations to C89 declaration order and replaced errnomodule's designated module initializer with positional fields.
scripts/vc6-probe-pythoncore-frontier.test.sh: added regression coverage for _datetime_exec()'s declaration family.
compat/msvc600/cpython-3.11.16-vc6-headers.patch: must be regenerated from the complete nested diff after this status update.

Exact verified results:

Command	Result
`bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; `ALL TESTS PASSED`
`bash -n` on frontier scripts plus existing probe/core/pathcch/getpath/stdint regression suites	exit 0; all applicable suites passed
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh`	exit 2; summary `total=30 compiled=29 cached=0 skipped=0`
Current first blocker	`cpython/Modules/faulthandler.c`

The next file is not a single narrow defect: the probe reports multiple independent MSVC6/Win9x issues in faulthandler.c, including C99 loop/mixed declarations, missing _WRITE_ABORT_MSG and _CALL_REPORTFAULT, missing __func__, volatile/declaration syntax failures, and a designated initializer at line 1335. No speculative broad edit was made.

This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`datetime_fromisoformat` C89 declaration-order slice)

Date: 2026-09-18 14:34 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. Before changing anything, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded _blake2/blake2s_impl.c sequence was force-re-probed first and remained applicable: _blake2/blake2s_impl.c compiled successfully, 27 sources compiled, and _datetimemodule.c remained first. The first stable diagnostics were _datetimemodule.c(5518) C2275/C2065 for datetime_fromisoformat()'s post-statement dtstr_clean declaration, followed by its same-function declaration-order cascades. One focused read-only Codex coding-agent delegation inspected this exact function and recommended hoisting all function-scope locals while preserving each initializer's original execution point; it exited 0, made no file changes, and ran no builds. This run addressed only that declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted datetime_fromisoformat()'s locals into its opening declaration group and changed initialized declarations to assignments at their original execution points. Sanitization, UTF-8 conversion, separator detection, parsing, cleanup labels, reference counting, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declaration group, original-point assignments, and rejection of mixed declarations.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` compiled, 27 sources compiled, and first stable diagnostics were `_datetimemodule.c(5518)` C2275/C2065 for `dtstr_clean`; summary `total=28 compiled=27 cached=0 skipped=0`.
focused read-only `codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended the minimal `datetime_fromisoformat()` hoist and original-point assignments; no files changed and no builds run by the child.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `datetime_fromisoformat declaration missing from opening group: PyObject *dtstr_clean;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `datetime_fromisoformat()` compiled past this family. The next first stable diagnostics are `_datetimemodule.c(6814)` C2275/C2065/C2059 for `_datetime_exec()`'s post-statement `PyTypeObject *types[]` declaration, followed by its C99 loop declaration; later distinct mixed declarations remain at `(6847)` and `(6875)`, and a designated initializer remains at `(7013)`. Summary `total=28 compiled=27 cached=0 skipped=0`. Existing C4761 warnings remain in `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all applicable regression suites and shell syntax checks passed; the focused frontier suite ended with `ALL TESTS PASSED`.
`git -C cpython diff --check`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; source diff is clean and the compatibility patch exactly matches the nested source diff.

Current compile-frontier state: datetime_fromisoformat() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _datetime_exec() at _datetimemodule.c(6814), beginning with the types[] declaration after executable statements. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` VC6 64-bit spelling/literal-suffix slice)

Date: 2026-09-18 10:17 UTC

The recorded frontier was force-re-probed first and remained applicable: _blake2/blake2s_impl.c compiled successfully, 27 sources compiled, and _datetimemodule.c remained first. The first stable diagnostics were the distinct VC6 long long/C99 literal-suffix family at _datetimemodule.c(5053)–(5074), followed by later declaration-order diagnostics. The required focused coding-agent delegation was attempted but could not launch because the runtime lacks the anthropic package; no child changes or independent review are claimed. This run addressed only the 64-bit spelling/literal-suffix family.

cpython/Modules/_datetimemodule.c — replaced this file's long long declarations with CPython's PY_LONG_LONG abstraction and its LL epoch literals with PY_LL(719163). Arithmetic, ranges, control flow, and API behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion rejecting long long/719163LL and requiring PY_LONG_LONG/PY_LL.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` compiled, 27 sources compiled, and first stable diagnostics were `_datetimemodule.c(5053)`–`(5057)` C2632/C2059/C2146/C2143 for `long long` and `LL`, with later cascades; summary `total=28 compiled=27 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `_datetimemodule long long keyword remains`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `_datetimemodule.c` compiled past the 64-bit spelling/literal-suffix family. The next first stable diagnostics are `_datetimemodule.c(5355)`/`(5356)` C2143 declaration-order errors; summary `total=28 compiled=27 cached=0 skipped=0`. Existing C4761 warnings remain in `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites, source checks, and nested source diff checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated and exactly matches the complete nested source diff.

Current compile-frontier state: _datetimemodule.c now compiles past its VC6 long long/literal-suffix family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct C89 declaration-order family beginning at _datetimemodule.c(5355). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `time_fromisoformat` C89 declaration-order slice)

Date: 2026-09-18 08:10 UTC

The recorded frontier was force-re-probed first and remained applicable: _blake2/blake2s_impl.c compiled successfully, 27 sources compiled, and _datetimemodule.c remained first. The first stable diagnostics were _datetimemodule.c(4699) C2275/C2146/C2065 for time_fromisoformat()'s post-statement Py_ssize_t len declaration, followed by the same function's later locals. One focused read-only Codex coding-agent delegation inspected this exact function and recommended hoisting len, p, the integer locals, tzinfo, and t while preserving each initializer's original execution point; it made no file changes and ran no builds. This run addressed only that declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted time_fromisoformat() locals into its opening declaration group and changed the UTF-8 conversion, zero initialization, parser call, and timezone construction declarations into assignments at their original execution points. Parsing, error labels, reference counting, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declarations and assignment sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` compiled, 27 sources compiled, and first stable diagnostic `_datetimemodule.c(4699) C2275/C2146/C2065` for `Py_ssize_t len`; summary `total=28 compiled=27 cached=0 skipped=0`.
focused read-only `codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended the minimal `time_fromisoformat()` declaration hoist and original-point assignments; no files changed and no builds run by the child.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `time_fromisoformat declaration missing from opening group: Py_ssize_t len;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `time_fromisoformat()` compiled past this declaration-order family. The next first stable diagnostics are the distinct `long long`/literal-suffix family at `_datetimemodule.c(5053)`–`(5057)`; summary `total=28 compiled=27 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites, source checks, and nested source diff checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated and exactly matches the complete nested source diff.

Current compile-frontier state: time_fromisoformat() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct _datetimemodule.c(5053) long long/integer-literal-suffix family. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `date_isocalendar` C89 result-local slice)

Date: 2026-09-18 06:02 UTC

The recorded _blake2/blake2s_impl.c sequence was force-re-probed first and remained applicable: 27 sources compiled, with _datetimemodule.c still first. The first stable diagnostics were _datetimemodule.c(3513) C2275/C2065 for date_isocalendar()'s post-statement PyObject* v declaration. One focused coding-agent delegation was attempted as required but failed before launch because the runtime lacks the anthropic package; no child files were used and no independent review is claimed. This run addressed only that C89 declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted PyObject* v into date_isocalendar()'s opening declaration group and changed only the constructor declaration initializer to an assignment at the original call site. ISO calendar calculation, NULL handling, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the opening declaration and constructor assignment.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 27 sources compiled; first stable diagnostics `_datetimemodule.c(3513) C2275/C2065` for `PyObject* v`; summary `total=28 compiled=27 cached=0 skipped=0`. Existing warnings remained at `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)` C4761.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `date_isocalendar v declaration missing from opening group`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `date_isocalendar()` compiled past this defect family. The next first stable diagnostics are `_datetimemodule.c(4699)` C2275/C2146/C2065 for a distinct declaration-order family; summary `total=28 compiled=27 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated and exactly matches the complete nested source diff.

Current compile-frontier state: date_isocalendar() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _datetimemodule.c(4699), a distinct declaration-order family. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `PyDateTime_IsoCalendarDateType` positional-initializer slice)

Date: 2026-09-18 03:54 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c878260a8a4549. Before changing anything, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The existing modifications to scripts/vc6-probe-pythoncore-frontier.sh and all prior CPython edits were preserved. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was force-re-probed first and remained applicable: _blake2/blake2s_impl.c compiled successfully, 27 sources compiled, and _datetimemodule.c remained first. The first stable diagnostic was _datetimemodule.c(3426) C2059: syntax error '.' from the designated PyTypeObject initializer for PyDateTime_IsoCalendarDateType. One focused coding-agent delegation was attempted for advisory inspection but failed before launch because the runtime lacks the anthropic package; no child files were used and no independent review is claimed. This run addressed only that designated-initializer family.

cpython/Modules/_datetimemodule.c — replaced only PyDateTime_IsoCalendarDateType's C99 designated fields with declared-order positional PyTypeObject fields, matching the already-portable datetime type definitions. The type name, size, repr, flags, documentation, methods, getset, and constructor values are unchanged; previously implicit fields remain zero/NULL.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the exact positional initializer.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` compiled, 27 sources compiled, and first stable diagnostic `_datetimemodule.c(3426) C2059` for the designated initializer; summary `total=28 compiled=27 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `iso calendar date type positional initializer mismatch`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; the designated-initializer blocker cleared and the next first stable diagnostic is `_datetimemodule.c(3513) C2275/C2065` for `PyObject* v` in `date_isocalendar()`; summary `total=28 compiled=27 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`; `cmp -s <(git -C cpython diff) compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated and exactly matches the complete nested source diff.

Current compile-frontier state: PyDateTime_IsoCalendarDateType now compiles past its C99 designated-initializer family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct post-statement PyObject* v declaration in date_isocalendar() at _datetimemodule.c(3513). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `iso_calendar_date_repr` C89 declaration-order slice)

Date: 2026-09-18 01:43 UTC

The recorded frontier was force-re-probed first and remained applicable: _blake2/blake2s_impl.c compiled successfully, 27 sources compiled, and _datetimemodule.c remained first. The first stable diagnostics were _datetimemodule.c(3349)/(3353) C2275/C2065 for iso_calendar_date_repr()'s post-statement week/weekday declarations. One focused read-only Codex delegation inspected this exact function and recommended hoisting those two declarations while preserving the lookup and NULL-check sequence; it made no file changes and ran no builds. This run addressed only that declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted PyObject* week and PyObject* weekday into iso_calendar_date_repr()'s opening declaration group and changed their initializers to assignments at the original evaluation points. Lookup order, NULL checks, and formatting behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declaration and assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` compiled, 27 sources compiled, and first stable diagnostics were `_datetimemodule.c(3349)`/`(3353)` C2275/C2065 for `week`/`weekday`; summary `total=28 compiled=27 cached=0 skipped=0`.
focused read-only `codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended opening declarations for `week`/`weekday` and assignments at their original lookup points; no files changed and no builds run by the child. No independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `iso_calendar_date_repr declaration missing from opening group: PyObject* week;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `iso_calendar_date_repr()` compiled past this defect family. The next first stable diagnostic is `_datetimemodule.c(3426) C2059` for the distinct designated initializer in `PyDateTime_IsoCalendarDateType`; summary `total=28 compiled=27 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check && git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; all applicable regression suites, source checks, and patch regeneration passed.

Current compile-frontier state: iso_calendar_date_repr() now compiles past its week/weekday C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct designated initializer in PyDateTime_IsoCalendarDateType at _datetimemodule.c(3426). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `date_fromisocalendar` C89 declaration-order slice)

Date: 2026-09-17 23:34 UTC

The recorded frontier was force-re-probed first and remained applicable: _blake2/blake2s_impl.c compiled successfully, 27 sources compiled, and _datetimemodule.c remained first. The first stable diagnostics were _datetimemodule.c(3152)/(3153) C2143 for date_fromisocalendar()'s post-statement month/rv declarations. One focused read-only Codex delegation inspected this exact function and recommended hoisting the declarations while preserving the conversion call's execution point; no child files were changed and no independent review is claimed. This run addressed only that declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted int month and int rv into date_fromisocalendar()'s opening declaration group and changed int rv = iso_to_ymd(...) to rv = iso_to_ymd(...) at the original evaluation point. The conversion call, error handling, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declaration and assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 27 sources compiled, including `_blake2/blake2s_impl.c`; first stable diagnostics `_datetimemodule.c(3152)`/`(3153)` C2143 and `(3156)`/`(3167)` cascades for `rv`/`month`; summary `total=28 compiled=27 cached=0 skipped=0`.
focused read-only `codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended opening declarations `int month; int rv;` and assignment `rv = iso_to_ymd(...)`; no files changed and no tests run by the child.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `date_fromisocalendar declaration missing from opening group: int month;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `date_fromisocalendar()` compiled past this defect family. The next first stable diagnostics are `_datetimemodule.c(3349)`/`(3353)` C2275/C2065 for `iso_calendar_date_repr()`'s post-statement `week`/`weekday` declarations; summary `total=28 compiled=27 cached=0`.
applicable regression suites and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.

Current compile-frontier state: date_fromisocalendar() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is iso_calendar_date_repr() at _datetimemodule.c(3349)/(3353), beginning with week/weekday. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `date_fromisoformat` C89 declaration-order slice)

Date: 2026-09-17 21:27 UTC

The recorded frontier was force-re-probed first and remained applicable: _blake2/blake2s_impl.c compiled successfully, 27 sources compiled, and _datetimemodule.c remained first. The first stable diagnostics were _datetimemodule.c(3095) for date_fromisoformat() declarations after executable statements. One focused Codex delegation was attempted in an isolated snapshot but failed before launch because the snapshot copy hit Disk quota exceeded; no child files were used and no independent review is claimed. This run addressed only the date_fromisoformat() declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted len, dt_ptr, year, month, day, and rv into date_fromisoformat()'s opening declaration group. Changed dt_ptr and date-local initialization to assignments at their original evaluation sequence; parsing, error handling, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declaration and assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 27 sources compiled, including `_blake2/blake2s_impl.c`; first stable diagnostics `_datetimemodule.c(3095)` C2275/C2146/C2065 for `Py_ssize_t len`, followed by the distinct later declaration families; summary `total=28 compiled=27 cached=0 skipped=0`.
focused Codex delegation	exit 1 before launch: isolated snapshot copy failed with `Disk quota exceeded`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `date_fromisoformat declaration missing from opening group: Py_ssize_t len;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `date_fromisoformat()` compiled past this defect family. The next first stable diagnostics are `_datetimemodule.c(3152)`/`(3153)` C2143 and `(3156)` C2065 for the distinct `date_fromisocalendar()` declaration family; summary `total=28 compiled=27 cached=0 skipped=0`.
applicable regression suites and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus diff check	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached nested `cpython` worktree at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: date_fromisoformat() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is date_fromisocalendar() at _datetimemodule.c(3152)/(3153), beginning with its post-statement month/rv declarations. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `delta_repr` C89 declaration-order slice)

Date: 2026-09-17 19:20 UTC

The recorded frontier was force-re-probed first and remained applicable: 27 sources compiled, including _blake2/blake2s_impl.c, and _datetimemodule.c remained first. The first stable diagnostics were _datetimemodule.c(2663)/(2670) for delta_repr()'s post-statement sep declaration, with a later repr declaration at (2697). One focused coding-agent delegation was attempted but failed before launch because the runtime lacks the anthropic package; no child files or independent review are claimed. This run addressed only the delta_repr() declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted const char *sep and PyObject *repr into delta_repr()'s opening declaration group; changed their initializers to assignments at the original evaluation points. Formatting, reference counting, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe delta_repr() declaration and assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 27 sources compiled, including `_blake2/blake2s_impl.c`; first stable diagnostics `_datetimemodule.c(2663)`/`(2670)` C2143/C2065 for `sep`; summary `total=28 compiled=27 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `delta_repr declaration missing from opening group: const char *sep;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `delta_repr()` compiled past this defect family. The next first stable diagnostics are `_datetimemodule.c(3095)` C2275/C2146/C2065 for a distinct declaration-order family; summary `total=28 compiled=27 cached=0 skipped=0`.
applicable regression suites and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached nested `cpython` worktree at commit `41388c9cb160d0886d5ca00d2e6c878260a8a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: delta_repr() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _datetimemodule.c(3095), beginning with a distinct declaration-order family. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `tzinfo_from_isoformat_results` C89 declaration-order slice)

Date: 2026-09-17 17:13 UTC

The recorded frontier was force-re-probed first and remained applicable: 27 sources compiled, including _blake2/blake2s_impl.c, and _datetimemodule.c was first. The first stable diagnostic was _datetimemodule.c(1435) for tzinfo_from_isoformat_results()'s post-statement PyObject *delta declaration. One focused coding-agent delegation was attempted but failed before launch because the runtime lacks the anthropic package; no child files or independent review are claimed. This run addressed only that declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted PyObject *delta into tzinfo_from_isoformat_results()'s opening declaration group and changed its initializer to an assignment at the original evaluation point. Timezone construction, reference counting, error handling, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declaration and assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 27 sources compiled; first stable diagnostic `_datetimemodule.c(1435) C2275/C2065` for `PyObject *delta`; later cascades included distinct declaration and legacy-integer families; summary `total=28 compiled=27 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `tzinfo_from_isoformat_results delta declaration missing from opening group`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `tzinfo_from_isoformat_results()` compiled past this defect family. The next first stable diagnostics are `_datetimemodule.c(2663)`/`(2670)` for `sep` in a distinct declaration-order family; summary `total=28 compiled=27 cached=0 skipped=0`.
applicable regression tests and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus patch check	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached nested `cpython` worktree at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: tzinfo_from_isoformat_results() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _datetimemodule.c(2663)/(2670), beginning with sep. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `parse_hh_mm_ss_ff` C89 declaration-order slice)

Date: 2026-09-17 12:59 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. Before changing anything, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded _datetimemodule.c frontier was force-re-probed first and remained applicable: 27 sources compiled, including _blake2/blake2s_impl.c, and parse_hh_mm_ss_ff() was first. The first stable diagnostics were C2143 declaration-order errors at _datetimemodule.c(822)–(829), with cascades from its post-statement locals, C99 loop declaration, and later declarations. One focused read-only Codex coding-agent lane inspected this exact function and recommended the minimal behavior-preserving C89 transformation; it made no file changes and ran no build. No independent review is claimed.

cpython/Modules/_datetimemodule.c — hoisted parse_hh_mm_ss_ff() locals and its static correction table, replaced the nonconstant vals initializer with assignments, changed the loop counter and character local to C89 declaration/assignment forms, and changed fractional locals to assignments. Parsing order and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the exact C89-safe parse_hh_mm_ss_ff() shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 27 sources compiled; first stable diagnostics `_datetimemodule.c(822)`/`(823)` C2143, followed by `(824)`, `(826)`, and `(829)` declaration/loop cascades; summary `total=28 compiled=27 cached=0 skipped=0`.
focused read-only Codex delegation	exit 0; recommended hoisting `p`, `p_end`, `vals`, `has_separator`, `i`, `len_remains`, `to_parse`, and `correction`, explicit `vals` assignments, C89 loop/local forms, and fractional assignments; no files changed and no child build run.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `parse_hh_mm_ss_ff declaration missing from opening group: int *vals[3];`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `parse_hh_mm_ss_ff()` compiled past its defect family. Existing warnings remain `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)` C4761. The next first stable diagnostics are `_datetimemodule.c(914)`/`(917)` for `parse_isoformat_time()`'s post-statement `rv`; summary `total=28 compiled=27 cached=0 skipped=0`.
applicable regression suites and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus patch check	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached nested `cpython` checkout at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: parse_hh_mm_ss_ff() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is parse_isoformat_time() at _datetimemodule.c(914), beginning with its rv declaration after executable statements. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `parse_isoformat_date` `rv` C89 slice)

Date: 2026-09-17 10:50 UTC

The recorded frontier was force-re-probed first and remained applicable: 27 sources compiled, including _blake2/blake2s_impl.c, and _datetimemodule.c was first. The first stable diagnostics were _datetimemodule.c(793)/(794) C2143/C2065 for the distinct rv declaration in parse_isoformat_date(). One focused coding-agent delegation was attempted as required but failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed. This run addressed only the rv declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted int rv into parse_isoformat_date()'s opening declaration group and changed only its original initializer to an assignment immediately before if (rv). ISO-week conversion and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe rv declaration/assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

|| Command | Result | ||---|---| || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh before this slice | exit 2; 27 sources compiled; first stable diagnostics _datetimemodule.c(793)/(794) C2143/C2065 for rv; summary total=28 compiled=27 cached=0 skipped=0. | || focused coding-agent delegation | failed before launch: The 'anthropic' package is required for the Anthropic provider; no child files were used and no independent review is claimed. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after adding the assertion, before source edit | exit 1 as required by TDD; parse_isoformat_date rv declaration missing from opening group. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after source edit | exit 0; ALL TESTS PASSED. | || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh after source edit | exit 2; _datetimemodule.c compiled past the rv family. The next first stable diagnostics are (822)/(823) C2143 for parse_hh_mm_ss_ff() declarations; summary total=28 compiled=27 cached=0 skipped=0. | || applicable regression suites and source checks | exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested git -C cpython diff --check all passed. | || git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch plus patch check | exit 0; compatibility patch regenerated and nested source diff is clean. | || pristine detached nested cpython checkout at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549 plus git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch | exit 0; patch applies cleanly; temporary worktree removed. |

Current compile-frontier state: parse_isoformat_date() now compiles past its rv C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct parse_hh_mm_ss_ff() declaration-order family at _datetimemodule.c(822)/(823). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `parse_isoformat_date` ISO-week locals C89 slice)

Date: 2026-09-17 08:44 UTC

The recorded frontier was force-re-probed first and remained applicable: 27 sources compiled, including _blake2/blake2s_impl.c, and _datetimemodule.c was first. The first stable diagnostics were _datetimemodule.c(769)/(770) C2143 for iso_week/iso_day, followed by a distinct rv declaration at (791). One focused coding-agent delegation was attempted as required but failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed. This run addressed only the ISO-week local declaration family.

cpython/Modules/_datetimemodule.c — hoisted int iso_week and int iso_day into parse_isoformat_date()'s opening declaration group and changed only their original initializers to assignments after the W marker. ISO-week parsing, default-day behavior, conversion, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe ISO-week declaration/assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 27 sources compiled; first stable diagnostics `_datetimemodule.c(769)`/`(770)` C2143 for `iso_week`/`iso_day`, followed by cascades; summary `total=28 compiled=27 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `parse_isoformat_date ISO-week declaration missing from opening group: int iso_week;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `parse_isoformat_date()` compiled past the ISO-week family. The next first stable diagnostics are `_datetimemodule.c(793)`/`(794)` C2143/C2065 for the distinct `rv` declaration; summary `total=28 compiled=27 cached=0 skipped=0`.
applicable regression suites and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus diff check	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached nested `cpython` checkout at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: parse_isoformat_date() now compiles past its iso_week/iso_day C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct rv declaration at _datetimemodule.c(791) (now observed as (793)/(794) after the hoist). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `parse_isoformat_date` C89 declaration-order slice)

Date: 2026-09-17 06:39 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. Before changes, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded _datetimemodule.c frontier was force-re-probed first and remained applicable: 27 sources compiled, and the first stable diagnostics were _datetimemodule.c(760)/(761) for parse_isoformat_date()'s post-statement uses_separator declaration. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed. This run addressed only that declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted unsigned char uses_separator into parse_isoformat_date()'s opening declaration group and changed only its initializer to an assignment at the original evaluation point. Separator detection, pointer advancement, ISO-week handling, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declaration/assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 27 sources compiled; first stable diagnostics `_datetimemodule.c(760)`/`(761)` C2143/C2065 for `uses_separator`; summary `total=28 compiled=27 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `parse_isoformat_date separator declaration missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `parse_isoformat_date()` compiled past the `uses_separator` family. The next first stable diagnostics are `_datetimemodule.c(769)`/`(770)` for `iso_week`/`iso_day`, followed by `rv` and later distinct declaration families; summary `total=28 compiled=27 cached=0 skipped=0`.
applicable regression suites and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus diff check	exit 0; compatibility patch regenerated and nested source diff is clean.

Current compile-frontier state: parse_isoformat_date() now compiles past its uses_separator C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct iso_week/iso_day declaration family at _datetimemodule.c(769)/(770). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `parse_digits` C89 loop-declaration slice)

Date: 2026-09-17 04:31 UTC

The recorded _datetimemodule.c frontier was force-re-probed first and remained applicable: 27 sources compiled, and the first stable diagnostics were _datetimemodule.c(727) C2143/C2065/C2059 errors from for (size_t i = ...), with declaration-order cascades later in the same source. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed. This run addressed only parse_digits()'s loop-counter declaration family.

cpython/Modules/_datetimemodule.c — hoisted size_t i into parse_digits()'s opening declaration group and changed only the for initializer to assignment. Digit parsing, pointer advancement, bounds check, and accumulation order are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe loop-counter declaration and assignment.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 27 sources compiled; first stable blocker `_datetimemodule.c(727)` C2143/C2065/C2059 from the C99 loop declaration; summary `total=28 compiled=27 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `parse_digits loop counter declaration missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `parse_digits()` compiled past the line-727 loop family. The next first stable diagnostics are `_datetimemodule.c(760)`/`(761)` for `parse_isoformat_date()`'s post-statement `uses_separator` declaration, followed by later distinct declaration families; summary `total=28 compiled=27 cached=0 skipped=0`.
applicable regression suites and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus `git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached nested `cpython` worktree at commit `41388c9cb160d0886d5ca00d2e6c8782608a4549` plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: parse_digits() now compiles past its C89 loop-declaration family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is parse_isoformat_date() at _datetimemodule.c(760), beginning with the uses_separator declaration after executable statements. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_datetimemodule.c` `iso_to_ymd` C89 declaration-order slice)

Date: 2026-09-17 02:25 UTC

The recorded cmathmodule.c frontier was force-re-probed first and remained applicable: 27 sources compiled, and _datetimemodule.c was first. The first stable diagnostics were _datetimemodule.c(422) and (424) C2143 declaration-order errors for day_1 and day_offset. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed. This run addressed only the iso_to_ymd() C89 declaration-order family.

cpython/Modules/_datetimemodule.c — hoisted day_1 and day_offset into the opening declaration group and changed only their later initializers to assignments. ISO-week validation, conversion order, and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declaration/assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 27 sources compiled; first stable diagnostics were `_datetimemodule.c(422)` and `(424)` C2143 declaration-order errors; summary `total=28 compiled=27 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `iso_to_ymd declaration missing from opening group: int day_1;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `iso_to_ymd()` compiled past the `day_1`/`day_offset` family. The next first stable diagnostics are `_datetimemodule.c(727)` C89 `for (size_t i = ...)`, followed by declaration-order errors at `(758)` and later; summary `total=28 compiled=27 cached=0 skipped=0`.
applicable regression suites and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and nested `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus `git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: _datetimemodule.c now compiles past iso_to_ymd()'s C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is parse_digits() at line 727, beginning with its C99 loop declaration. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`pymath.h` VC6 `Py_NAN` fallback slice)

Date: 2026-09-17 00:17 UTC

The recorded cmathmodule.c frontier was re-probed first and remained applicable: 26 sources compiled and cmathmodule.c(380) was the first stable diagnostic, error C2065: 'NAN' : undeclared identifier, caused by Py_NAN's C99 NAN fallback in Include/pymath.h. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed. This run addressed only the VC6 Py_NAN defect family.

cpython/Include/pymath.h — added an _MSC_VER < 1300 branch defining Py_NAN as (Py_HUGE_VAL * 0.0), retaining the existing builtin and C99 branches for other compilers. No cmath behavior or non-VC6 branch was changed.
scripts/vc6-probe-pythoncore-frontier.test.sh — added a focused TDD assertion requiring the VC6 fallback and retaining the C99 fallback.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 26 sources compiled; first stable diagnostic `cmathmodule.c(380) C2065: 'NAN' undeclared`; summary `total=27 compiled=26 cached=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; the new `pymath.h` fallback assertion reported `not ok`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `cmathmodule.c` compiled past the `NAN` blocker; existing warnings remain at `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)` C4761. The next first stable diagnostics are `_datetimemodule.c(422)`/`(424)` C2143 declaration-order errors; summary `total=28 compiled=27 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus `git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: cmathmodule.c now compiles past the VC6 Py_NAN/C99 NAN family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _datetimemodule.c at line 422, beginning with C89 declaration-order errors. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`cmathmodule.c` positional PyModuleDef initializer slice)

Date: 2026-09-16 22:10 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. Before changes, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded _blake2/blake2s_impl.c sequence was re-probed first and remained applicable through binascii.c. The actual first stable blocker was cmathmodule.c(380) : error C2065: 'NAN' : undeclared identifier, with a separate later designated-initializer diagnostic at line 1417. One focused Codex read-only coding-agent delegation inspected this exact source and recommended addressing the narrower PyModuleDef designated-initializer family first; it made no changes and no independent review is claimed. This run addressed only that initializer family; the NAN blocker remains untouched.

cpython/Modules/cmathmodule.c — replaced only cmathmodule's designated PyModuleDef fields with declared-order positional fields: name, doc, size, methods, and slots. Values and module behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the exact positional initializer and rejecting the designated form.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 26 sources compiled; first stable diagnostics were `cmathmodule.c(380) C2065: 'NAN' undeclared` and `(1417) C2059: syntax error : '.'`; summary `total=27 compiled=26 cached=0 skipped=0`.
focused Codex read-only delegation in `/tmp/python-win9x-codex-cmath`	exit 0; recommended the minimal positional `cmathmodule` initializer; no files changed and no tests run by the child.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `cmathmodule positional initializer mismatch`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `cmathmodule.c` compiled past the designated-initializer blocker. The next first stable diagnostic is `cmathmodule.c(380) C2065: 'NAN' undeclared`; existing warnings remain `arraymodule.c(2247)` and `audioop.c(1536)`, `(1609)` C4761; summary `total=27 compiled=26 cached=0 skipped=0`.
applicable regression suites and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: cmathmodule.c now compiles past its C99 designated PyModuleDef initializer under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct NAN/Py_NAN compatibility blocker at line 380; it was not changed speculatively. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`binascii.c` `a2b_base64` C89 declaration-order slice)

Date: 2026-09-16 20:02 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. Before changes, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded _blake2/blake2s_impl.c sequence was re-probed first and remained applicable through binascii.c. The prior zlib.h blocker was bypassed narrowly by suppressing USE_ZLIB_CRC32 for binascii.c; its in-tree CRC32 fallback is already present. The new first stable blocker was binascii_a2b_base64_impl() C89 declaration ordering at lines 393–418. One focused coding-agent delegation was attempted with Codex but failed before launch because the runtime requires the unavailable anthropic package; no child changes or independent review are claimed. This run addressed only the a2b_base64 declaration family.

scripts/vc6-probe-pythoncore-frontier.sh — suppresses only USE_ZLIB_CRC32 for cpython/Modules/binascii.c, keeping the external zlib dependency out of this minimal frontier while selecting binascii's existing fallback.
cpython/Modules/binascii.c — hoisted the a2b_base64 locals into the opening declaration group and changed only their initializers to assignments; decoding, error handling, allocation, and loop order are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added focused TDD assertions for the binascii define suppression and C89-safe local/assignment sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 25 sources compiled; first stable diagnostic was `binascii.c(66) : fatal error C1083: Cannot open include file: 'zlib.h'`; summary `total=26 compiled=25 cached=0 skipped=0`.
focused Codex delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the define-suppression assertion, before build-script edit	exit 1 as required by TDD; `frontier disables unavailable zlib CRC32 path for binascii.c`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after build-script edit	exit 2; binascii compiled past the zlib-header blocker; first stable diagnostics were `binascii.c(393)`–`(418)` C89 declaration errors; summary `total=27 compiled=26 cached=0 skipped=0`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the source assertion, before source edit	exit 1 as required by TDD; `a2b_base64 declaration missing from opening group: const unsigned char *ascii_data;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `a2b_base64` compiled past its C89 declaration family. Existing warnings remain `arraymodule.c(2247)`, `audioop.c(1536)`, and `(1609)` C4761. The next first stable diagnostics are `cmathmodule.c(380) : error C2065: 'NAN' : undeclared identifier` and `(1417) : error C2059: syntax error : '.'`; summary `total=27 compiled=26 cached=0 skipped=0`.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && bash -n scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary worktree removed.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'`	exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings.

Current compile-frontier state: binascii.c now compiles past both the unavailable external zlib-header path and a2b_base64's C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct cmathmodule.c NAN/designated-initializer family at lines 380 and 1417. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`audioop.c` `audioop_ratecv_impl` unavailable `SIZE_MAX` slice)

Date: 2026-09-16 17:50 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. Before changes, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded _blake2/blake2s_impl.c sequence was re-probed first and remained applicable: _blake2/blake2s_impl.c, atexitmodule.c, and all preceding sources compiled. The actual first stable blocker was audioop.c(1375) : error C2065: 'SIZE_MAX' : undeclared identifier. One focused external Codex read-only lane (codex-cli 0.153.4) inspected this exact defect and recommended the existing VC6-compatible (size_t)-1 idiom; it made no changes. This run addressed only that SIZE_MAX defect family under the strict TDD cycle.

cpython/Modules/audioop.c — replaced only the audioop_ratecv_impl() allocation-overflow guard's SIZE_MAX operand with ((size_t)-1). The strict comparison, MemoryError path, and allocation order are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added a focused source-shape regression requiring the replacement guard, rejecting SIZE_MAX within audioop_ratecv_impl(), and preserving the error/allocation sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` and preceding sources compiled, 24 sources compiled, and first stable diagnostic was `cpython\\Modules\\audioop.c(1375) : error C2065: 'SIZE_MAX' : undeclared identifier`; summary `total=25 compiled=24 cached=0 skipped=0`.
`codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended replacing the guard operand with `((size_t)-1)` based on the existing `_pickle.c` precedent; no files changed and no tests were run by the child.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `audioop ratecv SIZE_MAX guard replacement missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `audioop.c` compiled past the `SIZE_MAX` blocker, with existing warnings `audioop.c(1536)` and `(1609)` C4761. The next first stable diagnostic is `cpython\\Modules\\binascii.c(66) : fatal error C1083: Cannot open include file: 'zlib.h': No such file or directory`; summary `total=26 compiled=25 cached=0 skipped=0`.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'`	exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: audioop_ratecv_impl() now compiles past its unavailable SIZE_MAX family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct external zlib dependency at binascii.c(66) (zlib.h unavailable). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`atexitmodule.c` `atexitmodule` positional PyModuleDef initializer slice)

Date: 2026-09-16 15:44 UTC

The recorded frontier was re-probed first and remained applicable: _blake2/blake2s_impl.c and all preceding sources compiled, 23 sources compiled total, and atexitmodule.c first failed at line 293 with C2059 on C99 designated fields. This run addressed only that initializer family. One focused external coding-agent lane was attempted in an isolated temporary snapshot; it failed before launch with Error: No such file or directory (os error 2) after the initial snapshot setup attempt also used an incorrect relative source path. No child changes or independent review are claimed. The source edit was therefore performed directly under the required TDD cycle.

cpython/Modules/atexitmodule.c — replaced only atexitmodule's designated PyModuleDef fields with declared-order positional fields: head, name, doc, size, and methods. Values and module behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the exact positional initializer and rejecting designated fields.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` and preceding sources compiled, 23 sources compiled, and first stable diagnostic was `cpython\\Modules\\atexitmodule.c(293) : error C2059: syntax error : '.'`; summary `total=24 compiled=23 cached=0 skipped=0`.
focused coding-agent delegation in isolated `/tmp/python-win9x-codex-atexit` snapshot	failed before launch with `Error: No such file or directory (os error 2)`; no child files were used and no independent review is claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `atexitmodule positional initializer mismatch`, followed by `FAILED`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `atexitmodule.c` compiled past the designated-initializer family. The next first stable diagnostic is `cpython\\Modules\\audioop.c(1375) : error C2065: 'SIZE_MAX' : undeclared identifier`; summary `total=25 compiled=24 cached=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all applicable regression suites and focused frontier assertions reported `ALL TESTS PASSED`.
`git -C cpython diff --check`	exit 0.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: atexitmodule.c now compiles past its C99 designated PyModuleDef initializer under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct SIZE_MAX blocker in audioop.c at line 1375. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`atexitmodule.c` `atexit_unregister` C89 declaration-order slice)

Date: 2026-09-16 13:37 UTC

The recorded frontier was re-probed first, but its state had advanced beyond the recorded atexit_register() blocker: 23 sources compiled through atexitmodule.c, and the actual first stable diagnostics were in atexit_unregister() at line 243. This run addressed only that C89 declaration-order family: the loop counter i, callback pointer cb, and comparison result eq.

cpython/Modules/atexitmodule.c — hoisted int i, atexit_callback *cb, and int eq before executable statements; changed the loop, callback lookup, and rich-comparison declarations to assignments at their original evaluation points. Unregister traversal, error handling, callback deletion, and ordering are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the three opening declarations, rejecting mixed declarations, and preserving loop/lookup/comparison assignments.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 23 sources compiled through `atexitmodule.c`; first stable diagnostics were `atexitmodule.c(243)` C2143/C2065/C2059/C2044 errors from `for (int i = ...)` and later `cb`/`eq` declarations; summary `total=24 compiled=23 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `atexit_unregister declaration missing from opening group: int i;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `atexit_unregister()` compiled past its declaration-order family. The next first stable diagnostic is `atexitmodule.c(293) C2059` for the remaining designated module initializer; summary `total=24 compiled=23 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: atexit_unregister() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate designated initializer in atexitmodule.c at line 293. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`atexitmodule.c` `atexit_register` C89 declaration-order slice)

Date: 2026-09-16 11:29 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. The required focused coding-agent delegation was attempted but failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed.

The recorded atexitmodule.c frontier was re-probed first and remained applicable: 23 sources compiled through _blake2/blake2s_impl.c, and atexitmodule.c was first. This run addressed only atexit_register()'s C89 declaration-order family. The later atexit_clear() loop/declaration blockers remain untouched.

cpython/Modules/atexitmodule.c — hoisted func, state, r, size, and callback into the function's opening declaration group; changed only declaration initializers to assignments at their original evaluation points. Registration, allocation, reference-counting, error handling, and callback ordering are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the five opening declarations, rejecting mixed declarations, and preserving assignment/reallocation order.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 23 sources compiled; first stable diagnostics were `atexitmodule.c(150)` for `PyObject *func`, followed by `atexitmodule.c(157)`, `(161)`, and `(169)` declaration-order/cascade diagnostics; summary `total=24 compiled=23 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes or independent review are claimed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `atexit_register declaration missing from opening group: PyObject *func;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `atexit_register()` compiled past its declaration family. The next first stable diagnostics are `atexitmodule.c(243)` C2143/C2065/C2059 errors for the later `atexit_clear()` loop/declarations; summary `total=24 compiled=23 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: atexit_register() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct atexit_clear() blocker at atexitmodule.c(243). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`atexitmodule.c` `atexit_callfuncs` mixed-declaration slice)

Date: 2026-09-16 09:23 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before changes, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. One focused coding-agent delegation was attempted, but failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained applicable: cpython/Modules/_blake2/blake2s_impl.c and all preceding sources compiled, 23 sources compiled total, and atexitmodule.c was first. This run addressed only atexit_callfuncs()'s post-statement the_func/res declaration family. The later atexitmodule.c declaration families remain untouched.

cpython/Modules/atexitmodule.c — hoisted PyObject *the_func and PyObject *res into the opening declaration group and changed only their declaration initializers to assignments at the existing callback-call point. Callback order, reference-counting, error handling, and cleanup behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the two opening-group declarations, rejecting the mixed declarations, and preserving both assignment statements.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 23 sources compiled through `_blake2/blake2s_impl.c` and `arraymodule.c`; first stable diagnostics were `atexitmodule.c(99)` C2143 and `(100)` C2275/C2065 for `the_func`/`res`; summary `total=24 compiled=23 cached=0 skipped=0`.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'`	exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`; Wine emitted expected headless-display warnings.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `atexit_callfuncs: the_func declaration missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `atexit_callfuncs()` compiled past the `the_func`/`res` family. The next first stable diagnostics are `atexitmodule.c(150)` for `atexit_register()`'s mixed declaration, followed by `atexitmodule.c(157)` and later blockers; summary `total=24 compiled=23 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: atexit_callfuncs() now compiles past its mixed-declaration family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is atexit_register() at atexitmodule.c(150). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`atexitmodule.c` C89 loop-declaration slice)

Date: 2026-09-16 07:16 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before changes, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded _blake2/blake2s_impl.c sequence was re-probed first and remained passed: 23 sources compiled through arraymodule.c, and atexitmodule.c was first. This run addressed only the C89 loop-declaration family at atexit_cleanup() and atexit_callfuncs(). One focused Codex implementation lane (codex-cli 0.153.4) ran in an isolated temporary snapshot; its exact two-function candidate was inspected and applied manually. No independent review is claimed.

cpython/Modules/atexitmodule.c — added opening-group int i declarations in atexit_cleanup() and atexit_callfuncs(), changing only the two for initializers to assignments. Callback cleanup/call order and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added focused TDD assertions for both C89-safe loop forms and preserved loop sequences.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

|| Command | Result | |---|---| || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh before this slice | exit 2; _blake2/blake2s_impl.c and preceding sources compiled, 23 sources compiled total, and first stable diagnostics were atexitmodule.c(43) and (90) C2143/C2065/C2059/C2044 errors from C99 for (int i = ...) declarations; summary total=24 compiled=23 cached=0 skipped=0. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after adding the assertion, before source edit | exit 1 as required by TDD; cleanup: loop counter declaration missing. | || isolated codex exec -s workspace-write --skip-git-repo-check ... | exit 0; candidate changed only the two requested loops in atexitmodule.c; exact-content and whitespace checks passed; no build/runtime tests were run by the candidate. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after source edit | exit 0; ALL TESTS PASSED. | || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh after source edit | exit 2; both loop-declaration blockers cleared. The next first stable diagnostics are atexitmodule.c(99)/(100) for post-statement the_func/res declarations, followed by later mixed declarations; summary total=24 compiled=23 cached=0 skipped=0. | || bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check | exit 0; all applicable regression suites and source checks passed. | || git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check | exit 0; compatibility patch regenerated and nested source diff is clean. | || pristine detached v3.11.16 temporary worktree plus git apply --check | exit 0; patch applies cleanly; temporary verification worktree removed. |

Current compile-frontier state: atexitmodule.c now compiles past its two C89 loop-declaration blockers under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate atexit_callfuncs() mixed-declaration family at lines 99–100. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `arraymodule` PyModuleDef positional-initializer slice)

Date: 2026-09-16 05:09 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before changes, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded _blake2/blake2s_impl.c sequence was re-probed first and remained passed: _blake2/blake2s_impl.c and the preceding sources compiled, 22 sources compiled in total, and arraymodule.c was first. The first stable diagnostics were the separate C99 designated initializer at arraymodule.c(3161); the earlier array_modexec() declaration-order family was clear. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed. This run addressed only the arraymodule PyModuleDef initializer family.

cpython/Modules/arraymodule.c — converted arraymodule to declared-order positional PyModuleDef initialization: base, name, doc, size, methods, slots, traverse, clear, and free. Values and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the exact positional initializer and rejecting designated fields.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` and preceding sources compiled; 22 sources compiled; first stable diagnostics were `arraymodule.c(3161) C2059` for `.` and `,`; summary `total=23 compiled=22 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `arraymodule positional initializer mismatch`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `arraymodule.c` compiled successfully, with existing warning `arraymodule.c(2247) C4761`; next first stable blocker is `atexitmodule.c(43)` C89 loop declarations and related mixed declarations; summary `total=24 compiled=23 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: arraymodule.c now compiles past its PyModuleDef designated-initializer family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is atexitmodule.c(43), beginning with C89 loop-declaration errors. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `array_modexec` C89 declaration-order slice)

Date: 2026-09-16 03:01 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before changes, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was re-probed first and remained applicable: _blake2/blake2s_impl.c and the preceding sources compiled, 22 sources compiled in total, and arraymodule.c first failed on array_modexec() declarations at lines 3114, 3119, and 3125. This run addressed only that C89 declaration-order family. One focused Codex implementation lane (codex-cli 0.153.4) ran in an isolated copy with the existing edits; its candidate was inspected and applied manually. No independent review is claimed.

cpython/Modules/arraymodule.c — hoisted abc_mod, mutablesequence, and res into array_modexec()'s opening declaration group and changed only their declaration initializers to assignments at the original evaluation points. Import, attribute lookup, registration, cleanup, and error behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the three C89-safe declarations and preserved assignment sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(3114)`, `(3119)`, and `(3125)` C2275/C2065 declaration errors for `abc_mod`, `mutablesequence`, and `res`; the later designated initializer was at `(3158)`; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `array_modexec local missing from opening declaration group: PyObject *abc_mod;`.
isolated `codex exec -s workspace-write --skip-git-repo-check ...`	exit 0; candidate changed only the requested `array_modexec()` source block; its scope assertion passed and `git diff --check` produced no output. No candidate build or runtime tests were run.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; the three `array_modexec()` declaration blockers cleared. The next first stable diagnostics are the separate designated `arraymodule` initializer at `arraymodule.c(3161)` C2059; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: array_modexec() now compiles past its three C89 declaration-order blockers under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate designated initializer in arraymodule at line 3161. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `arrayiter_spec` positional-initializer slice)

Date: 2026-09-16 00:54 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before this run, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was re-probed first and remained applicable: 22 sources compiled, including _blake2/blake2s_impl.c, and arraymodule.c first failed at the C99 designated initializer for arrayiter_spec at line 3026. This run addressed only that initializer family. The focused coding-agent delegation was attempted and failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed.

cpython/Modules/arraymodule.c — converted arrayiter_spec to declared-order positional PyType_Spec initialization: name, basicsize, itemsize (0), flags, and slots. Values and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion rejecting designated fields and requiring the positional field order.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostic was `arraymodule.c(3026) C2059 syntax error : '.'`; later blockers were `(3113)`, `(3118)`, `(3124)`, and `(3157)`; summary `total=23 compiled=22 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `arrayiter_spec retains designated fields`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; the `arrayiter_spec` C2059 blocker cleared. The next first stable diagnostics are `arraymodule.c(3114)`, `(3119)`, and `(3125)` for post-statement locals in `array_modexec()`, followed by the designated `arraymodule` initializer at `(3158)`; summary `total=23 compiled=22 cached=0 skipped=0`.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'`	exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: arraymodule.c now compiles past arrayiter_spec's C99 designated-initializer family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is array_modexec()'s post-statement abc_mod, mutablesequence, and res declarations at lines 3114, 3119, and 3125. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `array_arrayiterator_reduce_impl` C89 declaration-order slice)

Date: 2026-09-15 22:45 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. Before changes, PORT_STATUS.md, README.md, and /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. One focused coding-agent delegation was attempted as required, but failed before launch because the runtime lacks the anthropic package; no child changes or independent review are claimed.

The current frontier was re-probed first and remained applicable: _blake2/blake2s_impl.c and the preceding sources compiled, 22 sources compiled in total, and arraymodule.c remained first. The first stable diagnostics were arraymodule.c(2976)/(2978) from array_arrayiterator___reduce___impl() declarations after executable statements. This run addressed only that C89 declaration-order family. The later arrayiter_spec designated initializer at line 3026 and module-setup blockers remain untouched.

cpython/Modules/arraymodule.c — hoisted array_state *state and PyObject *func into the opening declaration group and changed only their later declaration initializers to assignments. Lookup, assertion, iterator handling, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the declaration group and preserved state lookup/func assignment sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(2976)` C2143 and `(2978)` undeclared/cascade errors for `func`; later diagnostics included lines 2992, 3004, 3024, 3111, 3116, 3122, and 3155; summary `total=23 compiled=22 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the corrected assertion, with source unchanged	exit 1 as required by TDD; `array iterator reduce state declaration missing from opening group`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; the `array_arrayiterator___reduce___impl()` C2143/undeclared-local blockers cleared. The next first stable diagnostic is `arraymodule.c(3026)` C2059 for the separate `arrayiter_spec` designated initializer; later blockers remain at 3113, 3118, 3124, and 3157; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary verification worktree removed.
`git diff --check` at the workspace root	exit 2 only on the generated compatibility patch's pre-existing patch-payload trailing-whitespace lines; nested `git -C cpython diff --check` remains exit 0.

Current compile-frontier state: array_arrayiterator___reduce___impl() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate arrayiter_spec C99 designated initializer at arraymodule.c(3026). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `arrayiter_next` C89 declaration-order slice)

Date: 2026-09-15 20:27 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549. The nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. README.md and the legacy-toolchain reference at /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md were read before changes. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. One focused coding-agent delegation was attempted as required, but could not launch because the runtime lacks the anthropic package; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained applicable: _blake2/blake2s_impl.c and the preceding sources compiled, 22 sources compiled in total, and arraymodule.c remained first. The first stable diagnostics were arraymodule.c(2922)/(2923) from arrayiter_next()'s debug-only array_state declaration after executable statements. This run addressed only that C89 declaration-order family. The later array_arrayiterator___reduce___impl() declaration at line 2976, arrayiter_spec designated initializer, and module-setup blockers remain untouched.

cpython/Modules/arraymodule.c — added a bare array_state *state to arrayiter_next()'s opening declaration group and changed the debug-only lookup to an assignment. The #ifndef NDEBUG guard, type assertion, lookup point, and iterator behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declaration and preserved debug lookup/assertion sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(2922)` C2143 and `(2923)` undeclared/cascade errors for `state`; later diagnostics included lines 2975, 2991, 3023, 3110, 3115, 3121, and 3154; summary `total=23 compiled=22 cached=0 skipped=0`.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'`	exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; after correcting the assertion matcher, it failed with `arrayiter_next state declaration missing from opening group`. No production source was changed before the expected red result.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; the `arrayiter_next()` C2143/state blockers cleared. The next first stable diagnostics are `arraymodule.c(2976)`/`(2978)` for `array_arrayiterator___reduce___impl()`'s post-statement `array_state`/`func` declarations, followed by lines 2992, 3024, 3111, 3116, 3122, and 3155; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: arrayiter_next() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is array_arrayiterator___reduce___impl() at arraymodule.c(2976). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `array_spec` positional-initializer slice)

Date: 2026-09-15 18:24 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The relevant reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was re-probed first and remained applicable: _blake2/blake2s_impl.c compiled cleanly, 22 sources compiled, and arraymodule.c first failed at the C99 designated initializer for array_spec at line 2876. This run addressed only that initializer family. One focused Codex implementation lane (codex-cli 0.153.4) ran in an isolated minimal copy after an initial oversized-copy attempt hit /tmp disk-quota exhaustion; the candidate diff was inspected and applied manually. No independent review is claimed.

cpython/Modules/arraymodule.c — converted array_spec to declared-order positional PyType_Spec initialization: name, basicsize, itemsize (0), flags, and slots. Values and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion rejecting designated fields and requiring the positional field order.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` compiled cleanly, 22 sources compiled, and first stable diagnostics were `arraymodule.c(2876) C2059 syntax error : '.'`; later diagnostics included iterator declaration-order, additional designated initializers, and module-setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`.
focused assertion after adding it, before source edit	exit 1 as required by TDD; `array_spec retains designated fields`.
focused Codex implementation lane in `/tmp/python-win9x-codex-array-spec`	exit 0; candidate changed only the requested `array_spec` source block, with positional fields in declared order; candidate diff was inspected before manual application.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; the `array_spec` C2059 blocker cleared. The next first stable diagnostics are `arraymodule.c(2922)`/`(2923)` for `arrayiter_next()`'s debug-only `array_state` declaration after executable statements, followed by distinct declaration, initializer, and module-setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: arraymodule.c now compiles past array_spec's C99 designated-initializer family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate arrayiter_next() debug-block declaration-order family at arraymodule.c(2922). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `arraytype_doc` VC6 string-size slice)

Date: 2026-09-15 16:14 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The legacy-toolchain reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was re-probed first and remained applicable: _blake2/blake2s_impl.c compiled cleanly, 22 sources compiled, and arraymodule.c remained first. The first stable diagnostic was arraymodule.c(2830) : error C2026: string too big, trailing characters truncated in arraytype_doc. This run addressed only that VC6 string-literal-size family. One focused Codex implementation lane (codex-cli 0.153.4) ran in an isolated /tmp/python-win9x-codex-array-doc copy, preserved the existing local edits, and supplied the candidate shape. The candidate was inspected and applied manually; no independent review is claimed.

cpython/Modules/arraymodule.c — split arraytype_doc at the existing documentation-section boundary into adjacent string literals, keeping the complete 2,340-byte documentation text and the existing PyDoc_STRVAR/Py_tp_doc behavior unchanged. The resulting literal chunks are 1,346 and 994 bytes.
scripts/vc6-probe-pythoncore-frontier.test.sh — added a focused TDD assertion that all literals are at most 2,048 bytes, the concatenated documentation SHA-256 remains 36d98a6261ec374e1e5ed2da654bb1c47286a2658b86c28800af1543c40f6822, and the type documentation slot is retained.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` compiled cleanly, 22 sources compiled, and first stable diagnostics were `arraymodule.c(2830) C2026 string too big`, followed by designated-initializer, declaration-order, and module-setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`.
`codex exec -s workspace-write --skip-git-repo-check ...` in isolated `/tmp/python-win9x-codex-array-doc`	exit 0; candidate changed only `arraymodule.c` and the focused test, reported RED exit 1 before the source split and GREEN exit 0 after it, and passed shell syntax checking. No candidate files were copied automatically.
focused TDD assertion in the delegated copy before source edit	exit 1 as required by TDD; `arraytype_doc exceeds VC6's 2048-byte individual string literal limit`.
focused TDD assertion in the delegated copy after source edit	exit 0; `ok - arraymodule arraytype_doc uses VC6-sized literals with unchanged text`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after applying the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; the C2026 blocker cleared. The next first stable diagnostic is `arraymodule.c(2876) : error C2059: syntax error : '.'` for `array_spec`, followed by declaration-order and module-setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; every applicable regression suite and source check reported `ALL TESTS PASSED`.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff is clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: arraymodule.c now compiles past arraytype_doc's VC6 string-size family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate C99 designated initializer in array_spec at line 2876. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `typecode_to_mformat_code` 64-bit width spelling slice)

Date: 2026-09-15 14:07 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The legacy-toolchain reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was re-probed first and remained applicable: _blake2/blake2s_impl.c compiled cleanly, 22 sources compiled, and arraymodule.c remained first with sizeof(long long) diagnostics at arraymodule.c(1911) and (1915). One focused coding-agent delegation was attempted but failed before launch because the anthropic package is unavailable; no child changes or independent review are claimed. This run addressed only that sizeof(long long) defect family.

cpython/Modules/arraymodule.c — changed only the q/QQ cases in typecode_to_mformat_code() from sizeof(long long) to sizeof(PY_LONG_LONG). Signedness, typecode dispatch, width calculation, and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring exactly two sizeof(PY_LONG_LONG) assignments in typecode_to_mformat_code() and rejecting the old spelling.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(1911)` and `(1915)`, `error C2632: 'long' followed by 'long' is illegal`; later diagnostics included string-size, initializer, declaration-order, and API blockers; summary `total=23 compiled=22 cached=0 skipped=0`.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'`	exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `get_native_typecode q/QQ width is not VC6-compatible`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; the `(1911)`/`(1915)` diagnostics cleared. The next first stable diagnostics are `arraymodule.c(2830)` string-size, `(2876)` initializer, `(2921)` declaration-order, and later API/setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks reported `ALL TESTS PASSED`.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: typecode_to_mformat_code() now compiles past its q/QQ sizeof(long long) keyword family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is arraymodule.c(2830), the separate string-size family. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `array_array_fromunicode` C89 declaration-order slice)

Date: 2026-09-15 11:59 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The legacy-toolchain reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was re-probed first and remained applicable: _blake2/blake2s_impl.c compiled cleanly, 22 sources compiled, and arraymodule.c remained first with C89 declaration diagnostics at arraymodule.c(1746) and (1750). This run addressed only array_array_fromunicode_impl()'s ustr_length/old_size declaration-order family. One focused Codex read-only delegation (codex-cli 0.153.4) inspected the exact function and recommended the minimal hoist; it made no changes. No independent review is claimed.

cpython/Modules/arraymodule.c — hoisted ustr_length into the function declaration group and old_size before the decrement in the guarded block; changed only the declaration initializers to assignments, preserving conversion/guard/decrement/resize evaluation points and behavior.
scripts/vc6-probe-pythoncore-frontier.test.sh — added focused TDD assertions for the declaration groups, assignment sequence, and preserved guard/decrement behavior.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(1746)`/`(1750)` for C89 `ustr_length`/`old_size`; later diagnostics included 64-bit, string-size, initializer, and API blockers; summary `total=23 compiled=22 cached=0 skipped=0`.
`codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended hoisting exactly `ustr_length` and `old_size`, retaining their original evaluation points; no files changed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `fromunicode: ustr_length declaration missing from opening group`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; both `ustr_length`/`old_size` diagnostics cleared. The next first stable diagnostics are `arraymodule.c(1911)`/`(1915)` for the separate `long long` family, followed by string-size, initializer, declaration-order, and API blockers; summary `total=23 compiled=22 cached=0 skipped=0`.
full applicable regression suite and source checks	exit 0; shell syntax, public/core/PathCch/getpath/stdint/frontier suites and `git -C cpython diff --check` all passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` plus diff check	exit 0; compatibility patch regenerated and source diff clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: array_array_fromunicode_impl() now compiles past its ustr_length/old_size C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate long long family at arraymodule.c(1911) and (1915). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `array_state` declaration-order slice)

Date: 2026-09-15 09:53 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The relevant reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md. MSVC6 remains an external/local-only prerequisite through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was re-probed first and remained applicable: 22 sources compiled, including _blake2/blake2s_impl.c, then arraymodule.c was first. This run addressed only the two C89 declaration-order diagnostics for array_state in array_array_fromfile_impl() and array_array_tofile_impl(). One focused Codex read-only delegation inspected the exact functions and recommended the minimal hoist; it made no changes. No independent review is claimed.

cpython/Modules/arraymodule.c — added one bare array_state *state declaration to each function's opening declaration group and changed only the two later declaration initializers to assignments. Lookup timing, early exits, assertions, and write/read sequences are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added focused TDD assertions for both functions.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.

Exact command results: prior slice recorded in the following historical entry; all applicable regression suites, patch regeneration, and pristine patch application passed.

Current compile-frontier state: array_array_fromfile_impl() and array_array_tofile_impl() now compile past their array_state declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier was arraymodule.c(1746)/(1750), addressed in the entry above. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `array_repeat` C89 declaration-order slice)

Date: 2026-09-15 03:34 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The legacy-toolchain reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md. MSVC6 remains an external/local-only prerequisite invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded arraymodule.c(920) frontier was re-probed first and remained true: 22 sources compiled, including _blake2/blake2s_impl.c, then array_repeat() was the first failing source. This run addressed only its C89 declaration-order family. One focused Codex read-only implementation-guidance lane (codex-cli 0.153.4) inspected the exact function and recommended the same five-local hoist; it made no changes. No independent review is claimed.

cpython/Modules/arraymodule.c — hoisted array_length, size, np, oldbytes, and newbytes before executable statements; changed only their later declaration initializers to assignments, preserving normalization, overflow checks, allocation, early returns, and byte repetition order.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declaration group and preserved assignment sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(920)`, `(924)`, `(925)`, `(931)`, and `(932)` for mixed C99 declarations in `array_repeat()`; later blockers included lines 1086, 1171, 1494, 1552, 1741, 1745, 1902, 1906, 2821, 2867, 2912, 2965, 2981, 3013, and 3100; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `array_repeat declaration missing: Py_ssize_t array_length`.
`codex exec -s read-only --skip-git-repo-check ...` focused implementation guidance	exit 0; recommended hoisting the five locals and preserving assignments at the original evaluation points; no files changed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `array_repeat()` compiled past the five declaration diagnostics. The next first stable diagnostics are `arraymodule.c(1086)` for `array_inplace_repeat()`'s post-statement `size` declaration, followed by distinct loop/declaration, API, 64-bit, string-size, initializer, and module-setup blockers; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks reported `ALL TESTS PASSED`.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff clean.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: array_repeat() now compiles past its C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is array_inplace_repeat() at arraymodule.c(1086). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `array_richcompare` duplicate `cmp` declaration slice)

Date: 2026-09-15 01:27 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The relevant reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md. MSVC6 remains an external/local-only prerequisite invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the previously verified banner is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was re-probed first and remained applicable: 22 sources compiled, then arraymodule.c failed first at the distinct duplicate int cmp; declaration after compare_sizes:. This run addressed only that C89 declaration-order family. One focused coding-agent implementation delegation was attempted and failed before launch because the anthropic package is unavailable; no child changes or independent review are claimed.

cpython/Modules/arraymodule.c — removed only the duplicate int cmp; declaration after compare_sizes:; the opening declaration remains the sole local and the size-comparison switch is unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added a focused assertion rejecting the duplicate post-label declaration and preserving the compare-size assignment sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

|| Command | Result | |---|---| || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh before this slice | exit 2; 22 sources compiled; first stable diagnostic was arraymodule.c(768) : error C2143: syntax error : missing ';' before 'type' for the duplicate int cmp;; later independent blockers began at lines 920, 924, 1166, 1489, 1547, 1736, 1897, 2816, 2862, 2907, 2960, 3008, and 3095; summary total=23 compiled=22 cached=0 skipped=0. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after adding the assertion, before source edit | exit 1 as required by TDD; array_richcompare compare_sizes retains duplicate cmp declaration. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after source edit | exit 0; ALL TESTS PASSED. | || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh after source edit | exit 2; the line-768 duplicate declaration blocker cleared. The next first stable diagnostics are the separate arraymodule.c(920) C89 declaration-order family (const after executable statements), followed by later declaration, initializer, string-size, and API-call blockers; summary total=23 compiled=22 cached=0 skipped=0. | || full applicable regression suite and source checks: bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check | exit 0; all suites reported ALL TESTS PASSED. | || git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check | exit 0; patch regenerated and nested source diff clean. | || pristine detached v3.11.16 temporary worktree plus git apply --check | exit 0; compatibility patch applies cleanly; temporary worktree removed. |

Current compile-frontier state: array_richcompare() now compiles past the duplicate cmp declaration under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate arraymodule.c(920) declaration-order family. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `array_richcompare` compare-size locals slice)

Date: 2026-09-14 23:19 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; verified banner: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded frontier was re-probed first and remained applicable: _blake2/blake2s_impl.c compiled cleanly, 22 sources compiled, and arraymodule.c remained the first failing source. This run addressed only the C89 declaration-order family for vs and ws in array_richcompare(); the separate duplicate int cmp declaration after compare_sizes: and all later blockers remain untouched. One focused Codex implementation lane (codex-cli 0.153.4) worked in an isolated temporary snapshot; its candidate was inspected and only the requested source shape was applied manually. No independent review is claimed.

cpython/Modules/arraymodule.c — added vs and ws to the opening declaration group and changed their post-label declaration-with-initializer statements to assignments. Evaluation point, size comparisons, and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring both locals before executable statements and preserving their assignment sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(766)`/`(767)` C89 `Py_ssize_t vs/ws` declarations, followed by the separate `int cmp` declaration at line 768 and later declaration, `long long`, string-size, and initializer families; summary `total=23 compiled=22 cached=0 skipped=0`.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'`	exit 0; banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `array_richcompare size locals missing from opening group`.
isolated Codex implementation lane in `/tmp/python-win9x-codex-array`	exit 0; changed only the copied `arraymodule.c`; focused source-shape assertion reported `Source shape assertions passed`. No prohibited Git operations.
`diff -u cpython/Modules/arraymodule.c /tmp/python-win9x-codex-array/cpython/Modules/arraymodule.c`	exit 1 because the candidate differed only in the requested `vs/ws` declaration and assignment lines; candidate inspected before manual application.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after applying the source edit and correcting the declaration-group matcher	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `vs/ws` diagnostics cleared. The next first stable diagnostic is the separate post-label `int cmp` declaration at `arraymodule.c(768)`; summary `total=23 compiled=22 cached=0`.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython diff --check`	exit 0; compatibility patch regenerated and nested source diff clean.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all applicable regression suites and focused frontier assertions reported `ALL TESTS PASSED`.
pristine detached `v3.11.16` temporary worktree plus `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: array_richcompare() now compiles past the vs/ws C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct post-label int cmp declaration at line 768. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `array_richcompare` fast-path `res` declaration slice)

Date: 2026-09-14 21:12 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; verified banner: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86.

The recorded arraymodule.c frontier was re-probed first and remained applicable: _blake2/blake2s_impl.c and the preceding 21 sources compiled, then the first stable diagnostic was arraymodule.c(736) : error C2275: 'PyObject' : illegal use of this type as an expression for the fast-path PyObject *res declaration after executable statements. This run addressed only that C89 declaration-order family. A single focused Codex read-only delegation (codex-cli 0.153.4) inspected the exact source and recommended reusing the existing opening res local; it made no changes. No independent review is claimed.

cpython/Modules/arraymodule.c — changed only PyObject *res = cmp ? Py_True : Py_False; to res = cmp ? Py_True : Py_False;, reusing the existing declaration at the function opening. Boolean selection, reference counting, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring one opening res declaration, no fast-path declaration, and the preserved assignment/incref/return sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled, then `arraymodule.c(736)` first reported `error C2275: 'PyObject' : illegal use of this type as an expression`; later independent blockers began at lines 766, 921, 925, 1082, 1167, 1490, 1548, 1737, 1898, 2817, 2863, 2908, 2961, 3009, and 3096. Summary `total=23 compiled=22 cached=0 skipped=0`.
focused Codex delegation: `codex exec -s read-only --skip-git-repo-check ...`	exit 0; recommended the one-line reuse of the existing `res` declaration and supplied the focused assertion shape. No files changed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; `array_richcompare fast path retains res declaration`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; the line-736 `PyObject *res` blocker cleared. The next first stable diagnostics are the separate C89 `Py_ssize_t vs/ws` declarations at lines 766–767, followed by later declaration, `long long`, string-size, and initializer families. Summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\\\home\\\\ubuntu\\\\projects\\\\python-win9x\\\\MSVC600\\\\VC98\\\\Bin\\\\VCVARS32.BAT && cl'`	exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: array_richcompare() now compiles past the fast-path res declaration family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate C89 declaration-order family for Py_ssize_t vs and Py_ssize_t ws at lines 766–767. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `array_richcompare` C89 `cmp` declaration slice)

Date: 2026-09-14 19:05 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; verified banner: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. The single focused coding-agent delegation was attempted but failed before launch because the anthropic package is unavailable; no child changes or independent review are claimed.

The recorded arraymodule.c frontier was re-probed through the preceding getarrayitem() fix and remained applicable: 22 sources compiled, then arraymodule.c was the first failing source. This run addressed only the C89 declaration-order family for int cmp in array_richcompare(); later mixed-declaration families in that function remain untouched.

cpython/Modules/arraymodule.c — hoisted int cmp into array_richcompare()'s opening declaration group and removed only the fast-path declaration after executable statements. The comparison switch, assignments, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the opening-group declaration and preserving the fast-path comparison assignment sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, with source unchanged	exit 1 as required by TDD; `array_richcompare cmp declaration missing from opening group`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; 22 sources compiled and `arraymodule.c` was reached. The `int cmp` blocker cleared. The next first stable diagnostics are `arraymodule.c(736) : error C2275: 'PyObject' : illegal use of this type as an expression` for `PyObject *res` after executable statements, followed by later declaration-order, string-size, and initializer diagnostics; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh`	exit 0.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\home\\ubuntu\\projects\\python-win9x\\MSVC600\\VC98\\Bin\\VCVARS32.BAT && cl'`	exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings before the banner.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: array_richcompare() now compiles past the int cmp C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is its separate PyObject *res declaration at line 736. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` duplicate `getarrayitem` declaration slice)

Date: 2026-09-14 16:58 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all pre-existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; verified banner: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. The single focused coding-agent delegation was attempted for frontier guidance but failed before launch because the anthropic package is unavailable; no child changes or independent review are claimed.

The recorded arraymodule.c frontier was not still true on re-probe: _blake2/blake2s_impl.c and the earlier sources compiled, but getarrayitem() still contained a duplicate arrayobject *ap declaration after the debug-only assertion. This run therefore followed the actual first stable blocker and addressed only that duplicate/C89 declaration-order family. The previously recorded int cmp frontier was not changed in this slice.

cpython/Modules/arraymodule.c — removed the duplicate post-#endif arrayobject *ap declaration; retained the opening declaration, later assignment, assertion, and item access unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — strengthened the existing getarrayitem() regression assertion to require exactly one ap declaration and the preserved assignment form.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(633) : error C2143` at the duplicate `arrayobject *ap`, followed by parser/cascade diagnostics; summary `total=23 compiled=22 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the duplicate-declaration assertion, before the source edit	exit 1 as required by TDD; `getarrayitem ap declaration is duplicated`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit and assertion-boundary correction	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; the duplicate `getarrayitem()` blocker cleared. The next first stable diagnostic is the separate `arraymodule.c(726) : error C2143` for `int cmp` after executable statements; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh`	exit 0.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
pristine detached `v3.11.16` worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary verification worktree removed.

Current compile-frontier state: getarrayitem() now compiles past the duplicate declaration under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate array_richcompare() int cmp C89 declaration-order family at line 726. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `getarrayitem` C89 declaration-order slice)

Date: 2026-09-14 14:49 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; verified compiler banner: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. The required single focused coding-agent delegation was attempted but failed before launch because the anthropic package is unavailable; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained true: _blake2/blake2s_impl.c compiled cleanly, and arraymodule.c remained the first failing source after 22 compiled sources. The first stable diagnostic was the C89 declaration-order error at arraymodule.c(632) for arrayobject *ap after the debug-only executable assertion. This run addressed only that one declaration-order family.

cpython/Modules/arraymodule.c — hoisted arrayobject *ap before the #ifndef NDEBUG assertion block; preserved the assignment, assertion, bounds check, and item access behavior.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the ap declaration before the debug block and preserving the assignment form.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'`	exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`. Wine emitted expected headless-display warnings before the banner.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostic `cpython\\Modules\\arraymodule.c(632) : error C2143: syntax error : missing ';' before 'type'`; summary `total=23 compiled=22 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `getarrayitem ap declaration is not before debug block`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `getarrayitem()` advanced past the blocker. The next first stable diagnostic is the separate C89 declaration-order family at `arraymodule.c(727)`, `int cmp` after executable statements; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source checks passed.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh`	exit 0.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
first patch verification using `git -C build/verify-vc6-patch-worktree apply --check`	exit 128 due to an incorrect relative worktree path; no source was modified, and the temporary worktree was removed.
corrected pristine detached `v3.11.16` temporary worktree plus `git apply --check`	exit 0; patch applies cleanly; temporary worktree removed.

Current compile-frontier state: arraymodule.c now compiles past getarrayitem()'s C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate int cmp declaration-order family at line 727. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` q/QQ descriptor-width type spelling slice)

Date: 2026-09-14 12:43 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with all existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; verified compiler banner: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. The single focused coding-agent delegation was attempted for frontier implementation guidance but failed before launch because the anthropic package is unavailable; no child changes or independent review are claimed.

The recorded arraymodule.c frontier was re-probed first and remained true: 22 sources compiled, then the q/QQ descriptor entries reported error C2632: 'long' followed by 'long' is illegal at lines 572–573. This run addressed only that sizeof(long long) type-spelling family.

cpython/Modules/arraymodule.c — changed only the q/QQ descriptor item-width expressions from sizeof(long long) to sizeof(PY_LONG_LONG). Descriptor widths, typecodes, handlers, and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring VC6-compatible q/QQ descriptor widths and rejecting the original sizeof(long long) forms.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(572)` and `(573)`, `error C2632: 'long' followed by 'long' is illegal`; later diagnostics began at `arraymodule.c(632)` with C89 mixed declarations; summary `total=23 compiled=22 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `q descriptor does not use VC6-compatible 64-bit width`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; q/QQ `sizeof(long long)` diagnostics cleared. The next first stable diagnostics are the separate C89 declaration-order family beginning at `arraymodule.c(632)`, followed by later declaration, initializer, and string-size families; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0 for every command; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated from the complete nested checkout.
regenerated patch applied with `git -C build/verify-vc6-patch-worktree apply --check` to detached baseline `v3.11.16`	exit 0; temporary verification worktree removed.

Current compile-frontier state: the q/QQ descriptor widths now compile past their sizeof(long long) keyword family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate C89 declaration-order family beginning in arraymodule.c at line 632. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `DEFINE_COMPAREITEMS` 64-bit type-argument slice)

Date: 2026-09-14 10:37 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. The single focused coding-agent delegation was attempted but failed before launch because the anthropic package is unavailable; no child changes or independent review are claimed.

The recorded arraymodule.c frontier was re-probed first and remained true: 22 sources compiled, then VC6 reported the first stable long long type-argument diagnostics in the DEFINE_COMPAREITEMS(q, ...) and DEFINE_COMPAREITEMS(QQ, ...) macro invocations at lines 554–555. This run addressed only that macro-argument spelling family; later sizeof(long long) and declaration-order families remain untouched.

cpython/Modules/arraymodule.c — changed only the q and QQ DEFINE_COMPAREITEMS type arguments to PY_LONG_LONG and unsigned PY_LONG_LONG, respectively. The macro body and comparison behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring both VC6-compatible macro arguments and rejecting the original long long spellings.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'`	exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(554)` and `(555)`, `error C2632: 'long' followed by 'long' is illegal`, followed by later `sizeof(long long)` diagnostics at `(572)` and `(573)`; summary `total=23 compiled=22 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `signed q compare macro argument is not VC6-compatible`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; the macro-invocation `long long` diagnostics at `(554)` and `(555)` cleared. The next first stable diagnostics are the separate `sizeof(long long)` family at `(572)` and `(573)`, followed by later declaration-order and initializer families; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0 for every command; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated from the nested checkout.

Current compile-frontier state: the DEFINE_COMPAREITEMS q/QQ macro invocations now compile past their long long keyword family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate sizeof(long long) family in the arraymodule.c descriptor table. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `DEFINE_COMPAREITEMS` C89 loop-declaration slice)

Date: 2026-09-14 08:30 UTC

The recorded arraymodule.c frontier was re-probed first and remained true: 22 sources compiled, then VC6 failed at DEFINE_COMPAREITEMS invocation line 544 because the macro expanded for (Py_ssize_t i = 0; ...). This run addressed only that C89 loop-declaration family.

cpython/Modules/arraymodule.c — added Py_ssize_t i; to DEFINE_COMPAREITEMS's declaration group and changed the loop to for (i = 0; ...). Comparison order, bounds, increment, and return behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe macro declaration and loop form.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were the C89 `for (Py_ssize_t i = ...)` expansion at `arraymodule.c(544)` with `error C2143`, followed by parser fallout; summary `total=23 compiled=22 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `arraymodule compare macro loop counter declaration missing`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; the C89 loop-declaration blocker cleared. The next first stable diagnostics are the separate `long long` macro-type arguments at `arraymodule.c(554)`, `(555)`, `(572)`, and `(573)`, followed by later declaration-order and initializer families; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0 for every command; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated from the nested checkout only.
regenerated patch applied with `git -C <pristine-worktree> apply --check` at baseline commit	exit 0; temporary detached verification worktree removed.

Current compile-frontier state: DEFINE_COMPAREITEMS now compiles past its C89 loop-declaration family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate long long type-argument family in the macro invocations. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` q/QQ VC6 64-bit-type spelling slice)

Date: 2026-09-14 06:24 UTC

The recorded arraymodule.c frontier was re-probed first and remained true: 22 sources compiled, then VC6 reported the first stable long long keyword diagnostics in q_getitem(), q_setitem(), QQ_getitem(), and QQ_setitem() at lines 449–491. This run addressed only that active signed/unsigned 64-bit type-spelling family, using the existing PY_LONG_LONG abstraction.

cpython/Modules/arraymodule.c — replaced the live long long and unsigned long long declarations/casts in the q/QQ handlers with PY_LONG_LONG and unsigned PY_LONG_LONG. Function calls, widths, pointer casts, conversion behavior, and control flow are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring both VC6-compatible spellings and rejecting live long long keywords in that handler family.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first stable diagnostics were `arraymodule.c(449)`, `(455)`, `(459)`, `(467)`, `(473)`, `(484)`, and `(491)`, `error C2632: 'long' followed by 'long' is illegal`; summary `total=23 compiled=22 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `arraymodule q/QQ handlers use VC6-compatible 64-bit type spellings` failed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; q/QQ `long long` diagnostics cleared. The next first stable blocker is the separate C89 `for (Py_ssize_t i = ...)` family in `DEFINE_COMPAREITEMS` at `arraymodule.c(544)`; remaining later diagnostics include the macro's `long long` type arguments and additional declaration-order errors. Summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh; bash scripts/vc6-probe.test.sh; bash scripts/vc6-probe-core.test.sh; bash scripts/vc6-probe-pathcch.test.sh; bash scripts/generate-getpath-frozen.test.sh; bash scripts/vc6-probe-stdint.test.sh; bash scripts/vc6-probe-pythoncore-frontier.test.sh; git -C cpython diff --check`	exit 0 for every command; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated from the nested checkout only.
regenerated patch applied with `git -C <pristine-worktree> apply --check` at baseline commit	exit 0; temporary detached verification worktree removed.

Current compile-frontier state: the q/QQ handlers now compile past their live long long keyword family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate C89 loop-declaration family in DEFINE_COMPAREITEMS at arraymodule.c(538), first surfaced at invocation line 544. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`arraymodule.c` `u_setitem` C89 declaration-order slice)

Date: 2026-09-14 04:17 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; the verified compiler banner is Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. The required single focused coding-agent delegation was attempted but failed before launch because the anthropic package is unavailable; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained true: 22 sources compiled, then Modules/arraymodule.c was the first failing source. This run addressed only the C89 mixed-declaration family in u_setitem() at the len and w locals.

cpython/Modules/arraymodule.c — hoisted Py_ssize_t len and wchar_t w into u_setitem()'s declaration group; changed the first declaration-with-initializer to an assignment and removed the later w declaration. The PyUnicode_AsWideChar() call order and error/control-flow behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declarations and preserving both u_setitem() conversion calls.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 22 sources compiled; first blocker `arraymodule.c(265)` reported `error C2275: 'Py_ssize_t' : illegal use of this type as an expression`, with the related `wchar_t` declaration at line 272 and later cascade diagnostics; summary `total=23 compiled=22 cached=0 skipped=0`.
focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; `arraymodule u_setitem uses C89 declaration-order-safe len and w locals` failed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `arraymodule.c` passed the `u_setitem()` family. The next first stable blocker is the separate `long long` family at lines 449, 455, 459, 467, 473, 484, and 491, followed by C89 `for`-initializer diagnostics; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh; bash scripts/vc6-probe.test.sh; bash scripts/vc6-probe-core.test.sh; bash scripts/vc6-probe-pathcch.test.sh; bash scripts/generate-getpath-frozen.test.sh; bash scripts/vc6-probe-stdint.test.sh; bash scripts/vc6-probe-pythoncore-frontier.test.sh; git -C cpython diff --check`	exit 0 for every command; all applicable regression suites and source checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree	exit 0; temporary worktree removed.

Current compile-frontier state: arraymodule.c now compiles past u_setitem()'s C89 declaration-order family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate long long family in arraymodule.c. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_struct.c` PyModuleDef positional-initializer slice)

Date: 2026-09-14 02:10 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine with WINEPREFIX=/home/ubuntu/.wine-win9xport; compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. The single focused coding-agent delegation was attempted but failed before launch because the anthropic package is unavailable; no child changes or independent review are claimed.

The recorded _blake2/blake2s_impl.c state was re-probed first and was no longer the live frontier: it compiled cleanly. The actual first blocker was _struct.c(2484), a C99 designated initializer. This run addressed only that initializer family.

cpython/Modules/_struct.c — converted _structmodule to positional PyModuleDef initialization in declared field order (m_base, m_name, m_doc, m_size, m_methods, m_slots, m_traverse, m_clear, m_free). Values and behavior are preserved.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the exact positional initializer and rejecting designated fields.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` compiled cleanly and `_struct.c(2484)` reported `error C2059: syntax error : '.'`; summary `total=21 compiled=20 cached=0 skipped=0`.
Focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before source edit	exit 1 as required by TDD; `_structmodule positional initializer mismatch`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edit	exit 2; `_struct.c` compiled cleanly. The first blocker advanced to `Modules/arraymodule.c(265)`, beginning with `error C2275: 'Py_ssize_t' : illegal use of this type as an expression`, followed by C89 mixed declarations, `long long`, and other diagnostics; summary `total=23 compiled=22 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree	exit 0; temporary worktree removed.

Current compile-frontier state: _struct.c now compiles cleanly under MSVC6 (cl.exe 12.00.8804) through Wine, advancing the frontier to Modules/arraymodule.c. This is compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_struct.c C89 declaration-order frontier slice`)

Date: 2026-09-14 00:04 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine on Linux with WINEPREFIX=/home/ubuntu/.wine-win9xport; verified compiler banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. The required single focused coding-agent delegation was attempted, but the delegation runtime failed before launch because the anthropic package is unavailable; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained true: _blake2/blake2s_impl.c compiled cleanly, and _struct.c was the first failing source. This run addressed only the C89 declaration-order family at s_new(), s_dealloc(), and s_pack(); the later designated initializer remains untouched.

cpython/Modules/_struct.c — hoisted alloc_func in s_new(), tp and free_func in s_dealloc(), and writer in s_pack() into declaration groups before executable statements; preserved each initializer's original execution point and all control flow/refcount behavior.
scripts/vc6-probe-pythoncore-frontier.test.sh — added focused TDD assertions covering all three functions.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 20 sources compiled, then `_struct.c` reported the first stable C89 declaration-order blockers at lines 1447, 1530, and 1923.
Focused coding-agent delegation	failed before launch: `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding assertions, before source edits	exit 1 as required by TDD; the new assertion failed with `s_new: declaration not hoisted`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after source edits	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after source edits	exit 2; `_struct.c` compiled cleanly (no `_struct.c` diagnostics), and the first blocker advanced to the separate designated initializer at `_struct.c(2484)`; summary `total=21 compiled=20 cached=0 skipped=0`.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all applicable regression suites reported `ALL TESTS PASSED`.
`git -C cpython diff --check && bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh`	exit 0.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a clean detached `v3.11.16` temporary worktree	exit 0; temporary worktree removed.

Current compile-frontier state: _struct.c now compiles past the C89 declaration-order family under MSVC6 through Wine. The next narrow frontier is the separate C99 designated initializer at line 2484. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_struct.c` MSVC6 `long long` keyword compatibility slice)

Date: 2026-09-13 21:58 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. MSVC6 remains an external/local-only prerequisite, invoked through Wine on Linux with WINEPREFIX=/home/ubuntu/.wine-win9xport; verified compiler banner: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86. The single requested coding-agent implementation attempt was made but could not start because the delegation runtime lacks the anthropic package; no child changes or independent review are claimed.

The recorded frontier was re-probed first and remained true: _blake2/blake2s_impl.c compiled cleanly, and _struct.c was the first failing source. This run addressed only the distinct long long keyword family. The later _struct.c declaration-order and designated-initializer blockers remain untouched.

cpython/Modules/_struct.c — replaced live signed long long spellings with PY_LONG_LONG, live unsigned spellings with unsigned PY_LONG_LONG, and updated the two sign-extension casts and native-size calculations. Integer widths and runtime operations are unchanged; comments and user-facing format documentation retain their original wording.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion that strips comments/module documentation and rejects live long long keywords while requiring the complete PY_LONG_LONG replacement family.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 20 sources compiled, then `_struct.c` reported the first stable `error C2632: 'long' followed by 'long' is illegal` family at lines 103, 211, 213, 221, 234, 236, 244, 493, 501, 702, 712, 801–802, 843, 851, 858, 1064, 1072, and 1079. Later independent blockers were at 1447/1530/1923 and 2480. Summary `total=21 compiled=20 cached=0 skipped=0`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; the new `_struct` assertion failed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit and assertion matcher corrections	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; all `_struct.c` `long long` diagnostics cleared. The first stable blocker advanced to `_struct.c(1447)` C89 declaration ordering, followed by 1530/1923 declaration-order diagnostics and the designated initializer at 2480. Summary `total=21 compiled=20 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh` plus public/core/PathCch/getpath/stdint/frontier regression suites	exit 0; every applicable suite reported `ALL TESTS PASSED`.
`git -C cpython diff --check`	exit 0.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree	exit 0; temporary worktree removed.

Current compile-frontier state: _struct.c now compiles past the long long keyword family under MSVC6 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _struct.c's C89 declaration-order family at lines 1447, 1530, and 1923. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_struct.c` MSVC6 `_Bool` compatibility slice)

Date: 2026-09-13 19:48 UTC

The recorded _blake2/blake2s_impl.c state was re-probed first and was no longer the live frontier: _blake2s_impl.c compiled cleanly. The actual first stable blocker was _struct.c; this run addressed only the missing C99 _Bool defect family. A single focused Codex implementation lane ran in an isolated temporary snapshot; its candidate was inspected and copied manually. No independent review is claimed.

cpython/Modules/_struct.c — added a guarded MSVC6-only typedef unsigned char _Bool;, preserving the one-byte layout required by the module's native ? format handling. No other _struct.c defect family was changed.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the guarded one-byte typedef.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 20 sources compiled, then `_struct.c` first reported `_Bool` syntax/undeclared diagnostics at lines 85, 94, 504, 719, and related fallout. Summary `total=21 compiled=20 cached=0 skipped=0`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; `_struct provides a guarded one-byte VC6 _Bool compatibility typedef` failed.
focused Codex implementation lane in `/tmp/python-win9x-codex-struct`	exit 0; changed only `cpython/Modules/_struct.c`; its focused test ended with `ALL TESTS PASSED`. Candidate diff was inspected before manual application.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; all `_Bool` diagnostics cleared. The first stable blocker remains `_struct.c`'s separate `long long` keyword family, followed by C89 mixed declarations at lines 1447/1530/1923 and a designated initializer at line 2480. Summary `total=21 compiled=20 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source diff checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch regenerated. Existing generated patch payload retains its previously documented trailing-whitespace lines.
regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree	exit 0; temporary worktree removed.

Current compile-frontier state: _blake2/blake2s_impl.c and _struct.c through the _Bool family compile past this slice under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _struct.c's long long keyword compatibility family. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_stat.c` `statmodule` positional-initializer slice)

Date: 2026-09-13 17:40 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation could not start because the delegation runtime requires the unavailable anthropic package; implementation and verification were performed directly, with no independent review claimed. The MSVC6 banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86, invoked through Wine on Linux.

The recorded _stat.c state was re-probed first and remained true: 19 sources compiled, then VC6 reported only the statmodule C99 designated initializer at line 635. This run addressed only that designated-initializer defect family.

cpython/Modules/_stat.c — converted statmodule to positional PyModuleDef initialization in declared field order (m_base, m_name, m_doc, m_size, m_methods, m_slots, m_traverse, m_clear, m_free). The previously implicit trailing fields are explicitly NULL; names, values, and module behavior are preserved.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the exact positional initializer and rejecting designated fields.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 19 sources compiled; `_stat.c(635)` reported `error C2059: syntax error : '.'`; summary `total=20 compiled=19 cached=0 skipped=0`.
focused coding-agent delegation	not started; runtime reported `The 'anthropic' package is required for the Anthropic provider`; no child changes were used.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; `statmodule positional initializer mismatch`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `_stat.c` compiled cleanly and the first stable blocker advanced to `_struct.c`; summary `total=21 compiled=20 cached=0 skipped=0`. First `_struct.c` diagnostics include undeclared/unsupported `_Bool`, illegal `long long`, declaration-order errors, and a later designated initializer at line 2475.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites, shell syntax checks, and nested source diff checks passed.
`bash scripts/vc6-probe-core.sh cpython/Modules/main.c && bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 for both compile probes.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree	exit 0; temporary worktree removed.

Current compile-frontier state: _stat.c now compiles cleanly under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _struct.c, beginning with its _Bool/long long compatibility diagnostics. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_stat.c` Win9x/VC6 header-constant availability slice)

Date: 2026-09-13 15:33 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The MSVC6 banner remains Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86, invoked through Wine on Linux. One focused Codex implementation lane (codex-cli 0.153.4) used an isolated temporary worktree; its candidate was inspected and the narrow source change was applied to the real checkout. No independent review is claimed.

The recorded _blake2/blake2s_impl.c state was re-probed first and remained clean. The actual first stable blocker was _stat.c: the VC6 headers lacked FILE_ATTRIBUTE_DEVICE, FILE_ATTRIBUTE_VIRTUAL, and IO_REPARSE_TAG_SYMLINK. This run addressed only that header-constant availability family; the later _stat.c designated initializer remains untouched.

cpython/Modules/_stat.c — added guarded fallbacks in the existing MS_WINDOWS section: FILE_ATTRIBUTE_DEVICE 0x0040, FILE_ATTRIBUTE_VIRTUAL 0x10000, and IO_REPARSE_TAG_SYMLINK 0xA000000CL. The #ifndef guards preserve any definitions supplied by a newer Windows header.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring all three guarded definitions and exact values.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

|| Command | Result | |---|---| | VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh before this slice | exit 2; 19 sources compiled; _stat.c(580), (594), and (597) reported undeclared FILE_ATTRIBUTE_DEVICE, FILE_ATTRIBUTE_VIRTUAL, and IO_REPARSE_TAG_SYMLINK, followed by the designated-initializer error at line 622; summary total=20 compiled=19 cached=0 skipped=0. | | isolated codex exec -s workspace-write --skip-git-repo-check ... implementation lane | exit 0; its focused assertion produced RED exit 1 naming all three missing guards, then GREEN exit 0 after the candidate edit. Its attempted VC6 probe was blocked before compilation by Wine wineserver: mkdir /run/user/1000/wine/...: Read-only file system; no child changes were copied automatically. | | bash scripts/vc6-probe-pythoncore-frontier.test.sh after adding the focused assertion, before the source edit | exit 1 as required by TDD; _stat provides guarded VC6/Win9x file-attribute fallbacks failed with FILE_ATTRIBUTE_DEVICE. | | bash scripts/vc6-probe-pythoncore-frontier.test.sh after the source edit | exit 0; all focused assertions passed. | | VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh after the source edit | exit 2; _stat.c advanced past the three missing-constant diagnostics. The next first stable blocker is the separate C99 designated initializer at _stat.c(635); summary total=20 compiled=19 cached=0 skipped=0. | | bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh; bash scripts/vc6-probe.test.sh; bash scripts/vc6-probe-core.test.sh; bash scripts/vc6-probe-pathcch.test.sh; bash scripts/generate-getpath-frozen.test.sh; bash scripts/vc6-probe-stdint.test.sh; bash scripts/vc6-probe-pythoncore-frontier.test.sh; git -C cpython diff --check | exit 0; all applicable regression suites, shell syntax checks, and nested source diff checks passed. | | git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch | exit 0; compatibility patch regenerated. | | regenerated patch applied with git apply --check to a pristine temporary detached v3.11.16 worktree | exit 0; temporary worktree removed. |

Current compile-frontier state: _stat.c now compiles past the missing Win9x/VC6 header-constant family under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _stat.c's PyModuleDef C99 designated initializer at line 635. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_stat.c` `stat_exec` C89 declaration-order slice)

Date: 2026-09-13 13:27 UTC

The recorded _sre/sre.c frontier was re-probed before editing and remained clear. The actual first stable blocker was Modules/_stat.c: stat_exec() declared st_constants and the for loop counter after executable ADD_INT_MACRO calls, producing VC6/C89 declaration-order diagnostics at lines 557 and 570. This run made only that one defect-family fix; the later missing Win32 constants and designated initializer remain untouched.

cpython/Modules/_stat.c — moved the unchanged st_constants table and an int i declaration into stat_exec()'s opening declaration group; changed the loop to use for (i = 0; ...). Constant order, assigned values, registration order, and immediate error returns are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the table and loop counter before the first executable macro call and rejecting the C99 loop declaration.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

|| Command | Result | |---|---| || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh before this slice | exit 2; 19 sources compiled; _stat.c(557) and (570) reported C89 mixed-declaration errors, followed by parser fallout and missing FILE_ATTRIBUTE_DEVICE, FILE_ATTRIBUTE_VIRTUAL, and IO_REPARSE_TAG_SYMLINK, plus the later designated-initializer error at line 621; summary total=20 compiled=19 cached=0 skipped=0. | || codex exec -s read-only --skip-git-repo-check ... focused frontier inspection | exit 0; recommended moving st_constants and hoisting int i; no files changed. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after adding the focused assertion, before the source edit | exit 1 as required by TDD after correcting the assertion's extraction boundary; _stat stat_exec uses C89 declaration-order-safe constants and loop counter failed while prior assertions passed. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after the source edit | exit 0; all focused assertions passed. | || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh after the source edit | exit 2; _stat.c advanced past the C89 declaration-order family. Remaining first diagnostics are missing FILE_ATTRIBUTE_DEVICE, FILE_ATTRIBUTE_VIRTUAL, and IO_REPARSE_TAG_SYMLINK, followed by the statmodule designated initializer at line 622; summary total=20 compiled=19 cached=0 skipped=0. | || bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check | exit 0; all applicable regression suites and nested source diff checks passed. | || git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch | exit 0; compatibility patch regenerated. | || regenerated patch applied with git apply --check to a pristine temporary detached v3.11.16 worktree | exit 0; temporary worktree removed. |

Current compile-frontier state: Modules/_stat.c now compiles past its C89 declaration-order blocker under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the distinct Win9x/VC6 header-constant availability group (FILE_ATTRIBUTE_DEVICE, FILE_ATTRIBUTE_VIRTUAL, IO_REPARSE_TAG_SYMLINK), followed by the statmodule C99 designated initializer. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_sre/sre.c` `sremodule` PyModuleDef designated-initializer slice)

Date: 2026-09-13 11:20 UTC

The recorded _sre/sre.c frontier was re-probed before editing and remained true: 18 sources compiled, then VC6 reported the sremodule PyModuleDef C99 designated-initializer family at line 3031. This run made only that defect-family fix.

cpython/Modules/_sre/sre.c — converted sremodule from designated initializers to positional PyModuleDef initialization in declared field order (m_base, m_name, m_doc, m_size, m_methods, m_slots, m_traverse, m_clear, m_free). The previously omitted m_doc is explicitly NULL; field values, order, and behavior are preserved.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the exact positional sremodule initializer and rejecting designated fields.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 18 sources compiled; `_sre.c(3031)` reported `error C2059: syntax error : '.'` and `','`; summary `total=19 compiled=18 cached=0 skipped=0`.
isolated `codex exec -s workspace-write ...` focused implementation lane	exit 0 in a temporary worktree; candidate source edit and an extra upstream test-file change were inspected, but the temporary worktree was removed and only the narrow source shape was applied to the real checkout.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; `sremodule positional initializer mismatch` and `not ok - _sre sremodule uses C89-compatible positional initializers`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; all focused assertions passed.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `_sre/sre.c` compiled cleanly and the first stable blocker advanced to `Modules/_stat.c`; first diagnostics include C89 declaration-order errors at lines 557/570, missing `FILE_ATTRIBUTE_DEVICE`, `FILE_ATTRIBUTE_VIRTUAL`, `IO_REPARSE_TAG_SYMLINK`, and a designated-initializer error at line 621; summary `total=20 compiled=19 cached=0 skipped=0`.
`bash -n ... && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check`	exit 0; all applicable regression suites and source diff checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a pristine temporary detached `v3.11.16` worktree	exit 0; temporary worktree removed.

Current compile-frontier state: _sre/sre.c now compiles cleanly under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is Modules/_stat.c; it must be re-probed and addressed one defect family at a time. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_sre/sre.c` ADD_ULONG_CONSTANT C89 declaration-order slice)

Date: 2026-09-13 09:10 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. One focused Codex delegation ran read-only with codex-cli 0.153.4; it confirmed the smallest safe slice and made no changes. No independent review is claimed. The relevant legacy-toolchain reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md.

The recorded _sre/sre.c designated-initializer frontier was re-probed before editing and was no longer the live first blocker: the actual first stable diagnostics were the C89 mixed declarations inside ADD_ULONG_CONSTANT at lines 2982 and 2985. This run made only that one defect-family fix; the later sremodule designated initializers remain untouched.

cpython/Modules/_sre/sre.c — changed the macro-local int res = PyModule_AddObjectRef(...) to an opening int res; declaration followed by assignment after the existing if (!o) goto error;. Allocation, NULL handling, module insertion, decref ordering, error jump, both call sites, and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe macro shape and preserving the operation sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 18 sources compiled; `_sre/sre.c(3011)` and `(3012)` expanded `ADD_ULONG_CONSTANT` and reported C89 declaration-order diagnostics at macro lines 2982 and 2985, followed by parser fallout; summary `total=19 compiled=18 cached=0 skipped=0`.
`codex exec -s read-only --skip-git-repo-check "...inspect only the live VC6 frontier..."`	exit 0; read-only analysis identified the minimal `ADD_ULONG_CONSTANT` `res` hoist and no semantic risk; no files changed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit	exit 1 as required by TDD; the new `_sre ADD_ULONG_CONSTANT` assertion failed while prior assertions passed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; the `ADD_ULONG_CONSTANT` diagnostics cleared. The next first stable blocker is `_sre/sre.c(3031)`, the separate `sremodule` C99 designated-initializer family; summary `total=19 compiled=18 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && git -C cpython diff --check`	exit 0; all regression suites passed and the nested source diff was clean.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a pristine temporary detached `v3.11.16` worktree	exit 0; temporary worktree removed.

Current compile-frontier state: _sre/sre.c now compiles past the ADD_ULONG_CONSTANT C89 declaration-order defect under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate sremodule PyModuleDef designated-initializer family at lines 3030–3037. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_sre/sre.c` PyType_Spec designated-initializer slice)

Date: 2026-09-13 07:04 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation was attempted, but the delegation runtime could not start because the anthropic package is unavailable; no child changes or independent review were used. The relevant legacy-toolchain reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md.

The recorded _sre/sre.c frontier was re-probed before editing and remained true: 18 sources compiled, then VC6 reported three C99 designated initializers in pattern_spec, match_spec, and scanner_spec at lines 2826, 2894, and 2924. This run made only that designated-initializer defect-family fix.

cpython/Modules/_sre/sre.c — converted pattern_spec, match_spec, and scanner_spec from C99 designated initializers to positional PyType_Spec initializers in declared field order (name, basicsize, itemsize, flags, slots). The omitted scanner_spec.itemsize is explicitly 0, preserving C99 zero-initialization; values and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring all three positional initializer blocks and rejecting the old designated form.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; 18 sources compiled; `_sre/sre.c` first reported `error C2059: syntax error : '.'` at lines 2826, 2894, and 2924, followed by parser fallout at lines 3010+; summary `total=19 compiled=18 cached=0 skipped=0`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit	exit 1 as required by TDD; the new positional-`PyType_Spec` assertion failed with `pattern_spec` while prior assertions passed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; the three `_sre` `PyType_Spec` designated-initializer diagnostics cleared. The next stable blocker is the `_sre/sre.c` `ADD_ULONG_CONSTANT` macro's C89 mixed declarations at lines 2982 and 2985, followed by the `sremodule` `PyModuleDef` designated initializers; summary `total=19 compiled=18 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh` plus public/core/PathCch/getpath/stdint/frontier regression suites and `git -C cpython diff --check`	exit 0; every regression suite reported `ALL TESTS PASSED`, and the nested source diff was clean.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a pristine temporary detached `v3.11.16` worktree	exit 0; temporary worktree removed.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call ...\\VCVARS32.BAT && cl'`	exit 0; compiler banner `Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86`.

Current compile-frontier state: the three _sre/sre.c PyType_Spec designated initializers now compile past VC6/MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate sremodule PyModuleDef designated-initializer family at lines 3030–3037. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_sre/sre.c` GROUPREF_EXISTS `rc` C89 declaration-order slice)

Date: 2026-09-13 04:58 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation was attempted, but the delegation runtime could not start because the anthropic package is unavailable; no child changes or independent review were used. The relevant local reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md.

The recorded _sre/sre_lib.h frontier was re-probed before editing and remained true through that file. The first stable blocker was _sre/sre.c(1925), a C89 declaration-order defect: int rc = _validate_inner(...) followed the executable VTRACE statement in the SRE_OP_GROUPREF_EXISTS case. This run made only that defect-family fix.

cpython/Modules/_sre/sre.c — hoisted int rc into _validate_inner()'s opening declaration group and changed the later declaration-with-initializer to rc = _validate_inner(...). The assignment timing, validation branches, control flow, and behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added a focused TDD assertion requiring the function-level C89 declaration and assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

|| Command | Result | ||---|---| || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh before this slice | exit 2; 18 sources compiled; _sre/sre.c(1925) reported error C2143: syntax error : missing ';' before 'type' for int rc = ..., followed by rc undeclared and later _sre diagnostics; summary total=19 compiled=18 cached=0 skipped=0. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after adding the focused assertion, before the source edit | exit 1 as required by TDD; _sre GROUPREF_EXISTS uses C89 declaration-order-safe rc local failed while prior assertions passed. | || bash scripts/vc6-probe-pythoncore-frontier.test.sh after the source edit | exit 0; ALL TESTS PASSED. | || VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh after the source edit | exit 2; the rc blocker cleared and _sre.c reached the next distinct blockers: designated initializers at lines 2826, 2894, and 2924, followed by later declaration/designated-initializer diagnostics; summary total=19 compiled=18 cached=0 skipped=0. | || bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check | exit 0; all regression suites passed and the nested source diff was clean. | || git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch | exit 0; compatibility patch regenerated. | || regenerated patch applied with git apply --check to a pristine detached v3.11.16 worktree | exit 0; temporary verification worktree removed. |

Current compile-frontier state: _sre/sre.c now compiles past the GROUPREF_EXISTS rc declaration-order defect under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate C99 designated-initializer family at _sre/sre.c lines 2826, 2894, and 2924. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_sre/sre_lib.h` MIN_UNTIL repeat local C89 declaration-order slice)

Date: 2026-09-13 02:48 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation was attempted with the installed Codex launcher, but the delegation runtime could not start because the anthropic package is unavailable; no child changes or independent review were used. The relevant local reference was read from /home/ubuntu/.hermes/profiles/maxwell/skills/software-development/legacy-toolchain-os-porting/references/python-3-win9x-msvc6.md.

The recorded _sre/sre_lib.h frontier was re-probed before editing and remained true: _sre/sre.c was the first failing source after 18 compiled sources, with sre_lib.h(1215) : error C2275: 'SRE_REPEAT' : illegal use of this type as an expression at SRE_REPEAT *repeat_of_tail = state->repeat;. This run made only that one C89 mixed-declaration defect-family fix.

cpython/Modules/_sre/sre_lib.h — hoisted SRE_REPEAT *repeat_of_tail into SRE(match)'s opening declaration group and changed the later declaration to repeat_of_tail = state->repeat;. Assignment timing, repeat restoration, mark-stack handling, control flow, and matching behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added a focused TDD assertion requiring the C89-safe declaration and assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `getpath.c`, `_abc.c`, `_bisectmodule.c`, both `_blake2` implementations, `_codecsmodule.c`, `_collectionsmodule.c`, `_contextvarsmodule.c`, `_csv.c`, `_functoolsmodule.c`, `_heapqmodule.c`, `_json.c`, `_localemodule.c`, `_lsprof.c`, `_pickle.c`, `_randommodule.c`, and `_sha3/sha3module.c` compiled; `_sre/sre_lib.h(1215)` reported `error C2275: 'SRE_REPEAT' : illegal use of this type as an expression`, followed by `repeat_of_tail` undeclared and later `_sre.c` diagnostics; summary `total=19 compiled=18 cached=0 skipped=0`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit	exit 1 as required by TDD; `_sre MIN_UNTIL uses C89 declaration-order-safe repeat local` failed while prior assertions passed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit and assertion-boundary correction	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; the `sre_lib.h(1215)` blocker cleared. The next first stable blockers are `_sre/sre.c(1925)` C89 declaration-order (`rc`), then designated initializers at lines 2825, 2893, 2923, and later declaration/designated-initializer diagnostics; summary `total=19 compiled=18 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && git -C cpython diff --check`	exit 0.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all regression suites reported `ALL TESTS PASSED`.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree	exit 0; temporary verification worktree removed.

Current compile-frontier state: _sre/sre_lib.h now compiles past the MIN_UNTIL repeat_of_tail C89 declaration-order defect under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _sre/sre.c(1925), the separate C89 mixed-declaration rc defect. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_sre/sre_lib.h` SRE(match) C89 declaration-order slice)

Date: 2026-09-13 00:41 UTC

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required focused coding-agent delegation was attempted with Claude Code, but authentication failed with 401 OAuth access token has been revoked; no child changes or independent review were used. The referenced local python-3-win9x-msvc6.md document was not present at the expected skill-reference path.

The recorded _blake2/blake2s_impl.c state was re-probed before editing and remained clean, so the actual first stable blocker was followed instead: _sre/sre_lib.h(586), where SRE(match) declared const SRE_CHAR *ptr after an executable statement and an entrance: label, violating VC6/C89 declaration ordering. This run made only that one defect-family fix.

cpython/Modules/_sre/sre_lib.h — added const SRE_CHAR *ptr; to SRE(match)'s opening declaration group and changed the later declaration to ptr = (SRE_CHAR *)state->ptr;. The label, assignment point, control flow, and matching behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added a focused TDD assertion requiring the C89-safe declaration and assignment shape.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_blake2/blake2s_impl.c` compiled cleanly, then `_sre/sre.c` reached `_sre/sre_lib.h(586) : error C2143: syntax error : missing ';' before 'const'`, with parser-cascade diagnostics; summary `total=19 compiled=18 cached=0 skipped=0`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit	exit 1 as required by TDD after correcting the assertion's extraction boundary; `_sre SRE(match) uses C89 declaration-order-safe ptr local` failed while prior assertions passed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `_sre/sre_lib.h` cleared the `ptr` declaration-order blocker. The next first stable blocker is `_sre/sre_lib.h(1215) : error C2275: 'SRE_REPEAT' : illegal use of this type as an expression` at `SRE_REPEAT *repeat_of_tail = state->repeat;`, followed by `_sre.c` declaration/designated-initializer errors; summary `total=19 compiled=18 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all regression suites and nested source diff checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree	exit 0; temporary verification worktree removed.

Current compile-frontier state: SRE(match) now compiles past the line-586 C89 declaration-order defect under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is the separate C89 mixed-declaration SRE_REPEAT *repeat_of_tail at _sre/sre_lib.h(1215). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_sha3/sha3module.c` designated-initializer slice)

Date: 2026-09-12 22:35 UTC

The recorded _sha3/sha3module.c state was re-probed before editing and remained true: SHA3_dealloc() was already clean, while seven C99 designated initializers in the SHA3_TYPE_SPEC macro and _sha3module produced VC6 error C2059: syntax error : '.' diagnostics. This run made only that designated-initializer defect-family fix.

cpython/Modules/_sha3/sha3module.c — converted SHA3_TYPE_SPEC to positional PyType_Spec initialization in declared field order (name, basicsize, explicit itemsize zero, flags, slots), and converted _sha3module to positional PyModuleDef initialization in declared field order. Values and field order are preserved; no runtime behavior or control flow changed.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring both _sha3 initializer groups to be positional.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `_sha3/sha3module.c` was reached after 17 compiled sources and reported seven `error C2059: syntax error : '.'` diagnostics at lines 444, 447, 450, 453, 569, 572, and 651; `total=18 compiled=17 cached=0 skipped=0`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit	exit 1 as required by TDD; the new `_sha3` positional-initializer assertion failed while prior assertions passed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `_sha3/sha3module.c` compiled with no diagnostics and the first blocker advanced to `_sre/sre.c`, beginning with `_sre/sre_lib.h(586) : error C2143: syntax error : missing ';' before 'const'`, followed by parser-cascade diagnostics; `total=19 compiled=18 cached=0 skipped=0`.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all regression suites reported `ALL TESTS PASSED`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
regenerated patch applied with `git apply --check` to a pristine detached `v3.11.16` worktree	exit 0; temporary verification worktree removed.

Current compile-frontier state: _sha3/sha3module.c now compiles cleanly under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next narrow frontier is _sre/sre.c, whose first stable blocker is the C89 declaration-order defect in sre_lib.h at line 586. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_sha3/sha3module.c` `SHA3_dealloc` C89 declaration-hoist slice)

Date: 2026-09-12 20:28 UTC

The recorded _blake2/blake2s_impl.c state was re-probed before editing and was no longer the live frontier: _blake2/blake2s_impl.c compiled cleanly. The first stable blocker was instead _sha3/sha3module.c(183), where SHA3_dealloc() declared PyTypeObject *tp = Py_TYPE(self); after executable lock cleanup, violating VC6/C89 declaration ordering. This run made only that one defect-family fix.

cpython/Modules/_sha3/sha3module.c — hoisted PyTypeObject *tp into SHA3_dealloc()'s opening declaration group and changed the original declaration to tp = Py_TYPE(self);. Lock freeing, type lookup timing, object freeing, and type decref order are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the C89-safe declaration and preserving the cleanup/type/refcount sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff.
PORT_STATUS.md — this report.

Exact command results:

|| Command | Result | |---|---| | VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh before this slice | exit 2; _blake2/blake2s_impl.c compiled cleanly, then _sha3/sha3module.c(183) : error C2275: 'PyTypeObject' : illegal use of this type as an expression; designated-initializer diagnostics followed at lines 442, 445, 448, 451, 567, 570, and 649; total=18 compiled=17 cached=0 skipped=0. | | bash scripts/vc6-probe-pythoncore-frontier.test.sh after adding the focused assertion, before the source edit | exit 1 as required by TDD; the new SHA3_dealloc assertion failed while prior assertions passed. | | bash scripts/vc6-probe-pythoncore-frontier.test.sh after the source edit, before correcting the assertion's sequence matcher | exit 1; the source shape was correct but the newly added matcher incorrectly compared the function body without its signature. | | bash scripts/vc6-probe-pythoncore-frontier.test.sh after correcting the assertion | exit 0; ALL TESTS PASSED. | | VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh after the source edit | exit 2; _sha3/sha3module.c cleared the SHA3_dealloc() blocker. New first blockers are the seven C99 designated initializers in the SHA3 type specs and _sha3module (error C2059: syntax error : '.'); total=18 compiled=17 cached=0 skipped=0. | | bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh | exit 0; all regression suites reported ALL TESTS PASSED. | | bash -n scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check | exit 0. | | git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch | exit 0; compatibility patch regenerated. | | regenerated patch applied with git apply --check to a pristine detached v3.11.16 worktree | exit 0; temporary verification worktree removed. |

Current compile-frontier state: SHA3_dealloc() now compiles cleanly under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next blocker is the separate C99 designated-initializer family in _sha3/sha3module.c. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution.

Latest revision (`_randommodule.c` `_random_exec` C89 declaration-hoist slice)

Date: 2026-09-12 18:22 UTC

The recorded _pickle.c state was re-probed before editing and remained true through _pickle.c; the first stable blocker was the recorded _randommodule.c(599) C89 mixed-declaration defect. This run made only that one defect-family fix in _random_exec().

cpython/Modules/_randommodule.c — hoisted PyObject *longval and PyObject *longtype into _random_exec()'s opening declaration group, then changed only their original initializers to assignments. Allocation, NULL checks, Py_DECREF order, and error returns are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring C89-safe declarations and preserving the _random_exec() allocation/error/refcount sequence.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff and verified against a pristine v3.11.16 worktree.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
codex exec -s read-only --skip-git-repo-check "In /home/ubuntu/projects/python-win9x, inspect the current CPython v3.11.16 Windows 98/MSVC6 port state without modifying any files. Focus only on the recorded frontier in Modules/_randommodule.c at _random_exec(), especially the C89 mixed-declaration blocker around longval/longtype. Report the smallest evidence-backed edit, the exact focused test assertion that should be added first under strict TDD, and any semantic risks. Do not edit, commit, reset, stash, or push."	exit 0; read-only focused analysis reported the minimal two-local hoist and no semantic risk beyond preserving initializer timing. No files changed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; `_random_exec uses C89 locals and preserves initialization order` failed while prior assertions passed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0; `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `_randommodule.c` compiled cleanly and the frontier advanced to `_sha3/sha3module.c(183)`, `error C2275: 'PyTypeObject' : illegal use of this type as an expression`, followed by designated-initializer `error C2059` diagnostics at lines 442, 445, 448, 451, 567, 570, and 649; `total=18 compiled=17 cached=0 skipped=0`.
`WINEPREFIX=/home/ubuntu/.wine-win9xport wine cmd /c 'call Z:\\home\\ubuntu\\projects\\python-win9x\\MSVC600\\VC98\\Bin\\VCVARS32.BAT && cl'`	exit 0; compiler banner: Microsoft 32-bit C/C++ Optimizing Compiler Version `12.00.8804` for 80x86.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all regression suites and nested source diff checks passed.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
`git -C cpython worktree add --detach /home/ubuntu/projects/python-win9x/build/verify-vc6-patch-worktree v3.11.16 && git -C /home/ubuntu/projects/python-win9x/build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; patch applied cleanly to a pristine detached baseline, and the temporary worktree was removed.

Current compile-frontier state: _randommodule.c now compiles cleanly under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next blocker is _sha3/sha3module.c's C89 declaration-order and C99 designated-initializer defects. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution is claimed.

Latest revision (`_pickle.c` Unpickler_set_memo SIZE_MAX cleanup slice)

Date: 2026-09-12 16:15 UTC

The recorded _blake2/blake2s_impl.c state was re-probed before editing and was no longer the live frontier: the full source-list probe reached _pickle.c and reported the distinct missing SIZE_MAX blocker. This run therefore made only the actual first-frontier _pickle.c fix.

cpython/Modules/_pickle.c — changed Unpickler_set_memo() cleanup from for (i = new_memo_size - 1; i != SIZE_MAX; i--) to for (i = new_memo_size; i-- > 0;). The loop still decrements through exactly new_memo_size - 1 to 0, preserving decref order and cleanup behavior without relying on the unavailable VC6 SIZE_MAX definition.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for the no-SIZE_MAX cleanup loop and updated the existing Unpickler_set_memo() assertion to require the new C89-safe form.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff and verified against a pristine v3.11.16 worktree.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `total=16 compiled=15 cached=0 skipped=0`; `_pickle.c(7638)`, `error C2065: 'SIZE_MAX' : undeclared identifier`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the new assertion, before the source edit	exit 1 as required by TDD; the new cleanup assertion failed, while prior assertions passed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit and test adjustment	exit 0, `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `_pickle.c` compiled cleanly and the frontier advanced to `_randommodule.c(599)`, `error C2275: 'PyObject' : illegal use of this type as an expression`; `total=17 compiled=16 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh && git -C cpython diff --check`	exit 0; all regression suites passed and the nested source diff is clean.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; compatibility patch regenerated.
pristine detached `v3.11.16` worktree `git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; temporary verification worktree removed.

Current compile-frontier state: _pickle.c now compiles past Unpickler_set_memo() under MSVC 6.0 (cl.exe 12.00.8804) through Wine. The next blocker is _randommodule.c line 599, a C89 mixed-declaration defect. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution is claimed.

Latest revision (`_pickle.c` Unpickler_set_memo C89 loop-counter slice)

Date: 2026-09-12 14:08 UTC

The recorded frontier was re-probed before editing and remained true: _pickle.c compiled through Unpickler_traverse(), and the first stable blockers were the two C99 for (size_t i = ...) initializers in Unpickler_set_memo() at lines 7589 and 7637. The cleanup loop also exposed a separate SIZE_MAX undeclared diagnostic after the C99 syntax was removed.

cpython/Modules/_pickle.c — added a function-scoped size_t i; declaration and changed only the two Unpickler_set_memo() loop initializers to for (i = ...). Loop bounds, decrement behavior, cleanup, refcounting, and assignment timing are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion requiring the shared loop counter and both C89-safe loop forms.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff; it applies cleanly to pristine v3.11.16.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blockers `_pickle.c(7589)` and `(7637)` C99 loop declarations, with `SIZE_MAX` also undeclared.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; the new `Unpickler_set_memo` assertion failed while prior assertions passed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0, `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; both C99 loop diagnostics cleared. New first blocker is `_pickle.c(7638)`, `error C2065: 'SIZE_MAX' : undeclared identifier`; `total=16 compiled=15 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh` plus public/core/PathCch/getpath/stdint/frontier regression suites	exit 0; all suites reported `ALL TESTS PASSED`.
`git -C cpython diff --check`	exit 0.
`git -C cpython diff > compat/msvc600/cpython-3.11.16-vc6-headers.patch` followed by patch whitespace check	regeneration succeeded; generated patch check exits 2 because existing diff payload contains trailing-whitespace lines, while the nested source diff check is clean.
pristine detached `v3.11.16` worktree `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; temporary verification worktree removed.

Current compile-frontier state: Unpickler_set_memo() now compiles past the C99 loop-initializer family under VC6. The next blocker is the distinct missing/unsupported SIZE_MAX definition at the cleanup loop. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution is claimed.

Latest revision (`_pickle.c` Unpickler_traverse C89 declaration-order slice)

Date: 2026-09-12

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549; the nested cpython/ checkout remains detached with its existing uncommitted port edits preserved. Nothing was reset, cleaned, stashed, discarded, committed, pushed, or published. The required single focused Claude Code delegation was attempted in the existing checkout without permitting edits, but authentication failed with 401 OAuth access token has been revoked; no child changes or independent review were used.

The live forced VC6 probe was run before editing. It reached _pickle.c as the first blocker, not the older recorded _blake2 frontier: Unpickler_traverse() at line 7266 declared PyObject **memo = self->memo; after executable Py_VISIT() statements, violating VC6/C89 declaration ordering. This run therefore advanced the actual live frontier and did not touch _blake2.

cpython/Modules/_pickle.c — hoisted PyObject **memo to Unpickler_traverse()'s opening declaration group and changed the original declaration to memo = self->memo;. Assignment timing and traversal/refcount behavior are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for Unpickler_traverse() declaration ordering.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff; it applies cleanly to pristine v3.11.16.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blocker `_pickle.c(7266)`, `error C2143`, mixed declaration `PyObject **memo = self->memo;`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; the new `Unpickler_traverse` assertion failed while prior assertions passed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0, `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `Unpickler_traverse()` cleared. New first blockers are `_pickle.c(7589)` C99 `for (size_t i = ...)` and `_pickle.c(7637)` C99 `for (size_t i = ...)` with `SIZE_MAX` undeclared; `total=16 compiled=15 cached=0`.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; all regression suites reported `ALL TESTS PASSED`.
`git -C cpython diff --check && bash -n scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0.
pristine detached `v3.11.16` worktree `git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; temporary verification worktree removed.

Current compile-frontier state: _pickle.c now compiles past Unpickler_traverse() under VC6. The next narrow frontier is the distinct C99 for-initializer family in Unpickler_set_memo() at the two loop sites, with the SIZE_MAX diagnostic at the cleanup loop. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution is claimed.

Latest revision (`_pickle.c` load_readonly_buffer C89 declaration-order slice)

Date: 2026-09-12

The recorded _pickle.c frontier was re-probed before editing and remained true: load_next_buffer() compiles cleanly. The first stable blocker was load_readonly_buffer() at lines 5687–5688, where PyObject *obj = ... and PyObject *view = ... follow executable statements and violate VC6/C89 declaration ordering.

cpython/Modules/_pickle.c — hoisted PyObject *obj and PyObject *view beside Py_ssize_t len; changed the three initializers to assignments at their original execution points. No control flow or refcount ordering changed.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for load_readonly_buffer() declaration ordering.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff; it applies cleanly to pristine v3.11.16.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blocker `_pickle.c(5687)`, `error C2275` for `PyObject *obj`, followed by the same declaration-order error for `view`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; the new `load_readonly_buffer` assertion failed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0, `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `_pickle.c` cleared `load_readonly_buffer()`. New first stable blockers are `_pickle.c(7266)` C89 declaration-order fallout for `memo`, then C99 `for`-init/declaration fallout at lines 7587 and 7635 (`SIZE_MAX` also reported). Summary remains `total=16 compiled=15 cached=0 skipped=0`.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; every regression suite reported `ALL TESTS PASSED`.
`git -C cpython diff --check && bash -n scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0.
pristine detached `v3.11.16` worktree `git apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; temporary worktree removed.

Current compile-frontier state: _pickle.c now compiles past load_readonly_buffer() under VC6. The next narrow frontier is the later _pickle.c declaration-order/C99 syntax group beginning at line 7266. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution is claimed.

Latest revision (`_pickle.c` load_next_buffer C89 declaration-order slice)

Date: 2026-09-12

The recorded frontier was re-probed before editing and remained true through _pickle_PicklerMemoProxy_copy_impl(). The first stable blocker was load_next_buffer() at _pickle.c(5662), a C99 mixed declaration after the self->buffers == NULL executable check.

cpython/Modules/_pickle.c — hoisted PickleState *st and PyObject *buf into the function declaration group; preserved both _Pickle_GetGlobalState() assignment points and the iterator assignment order.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused TDD assertion for load_next_buffer() declaration ordering.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the complete nested git -C cpython diff; it applies cleanly to pristine v3.11.16.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blocker `_pickle.c(5662)`, `error C2275`, `PyObject *buf = PyIter_Next(...)`, with same-function declaration fallout.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the assertion, before the source edit	exit 1 as required by TDD; the new `load_next_buffer` assertion failed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0, `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `load_next_buffer()` cleared. New first blocker is `load_readonly_buffer()` at `_pickle.c(5687)`, C89 mixed declarations for `PyObject obj` and `PyObject view`; `total=16 compiled=15 cached=0 skipped=0`.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0; every regression suite reported `ALL TESTS PASSED`.
`git -C cpython diff --check && bash -n scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0.
pristine detached `v3.11.16` worktree `git apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0; temporary worktree removed.
regenerated patch included in top-level `git diff --check`	exit 2 due trailing-whitespace diagnostics in generated patch hunks; these are diff payload whitespace lines from existing CPython changes, not source-file diagnostics.

Current compile-frontier state: _pickle.c now compiles past load_next_buffer() under VC6. The next narrow frontier is load_readonly_buffer()'s two C89 mixed declarations at lines 5687–5688. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, no Wine execution of Python, and no real Windows 98 SE execution is claimed.

Date: 2026-09-12

Latest revision (`_pickle.c` PicklerMemoProxy.copy C89 for-init slice)

Baseline remains CPython v3.11.16 at commit 41388c9cb160d0886d5ca00d2e6c8782608a4549 in the pristine tag worktree. Existing uncommitted port edits were preserved; nothing was reset, cleaned, stashed, discarded, committed, pushed, or published.

The recorded frontier state was re-probed before editing and remained true: getpath.c, _abc.c, _bisectmodule.c, _blake2 sources, and _pickle.c through Pickler_traverse() compiled cleanly. The first stable blocker was _pickle.c(4895), the C99 for (size_t i = ...) initializer in _pickle_PicklerMemoProxy_copy_impl().

cpython/Modules/_pickle.c — added size_t i; to the function declaration group and changed only the loop initializer to for (i = 0; ...); behavior and assignment timing are unchanged.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused regression assertion before the source edit, as required by TDD.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the nested git -C cpython diff; it applies cleanly to pristine v3.11.16.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blocker `_pickle.c(4895)`, `error C2143`, C99 `for (size_t i = ...)`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit	exit 1 as required by TDD; the new `PicklerMemoProxy.copy` assertion failed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0, `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `_pickle.c(4895)` is cleared and the first stable blocker advances to `load_next_buffer()` at line 5662: C89 mixed declaration `PyObject *buf = PyIter_Next(...)`; `total=16 compiled=15 cached=0 skipped=0`.
shell syntax plus public/core/PathCch/getpath/stdint/frontier regression suites	exit 0; every suite reported `ALL TESTS PASSED`.
`git -C cpython diff --check` and `bash -n scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0.
pristine detached `v3.11.16` worktree `git apply --check` for regenerated patch	exit 0; temporary worktree removed.
focused Claude Code delegation	not completed: `401 OAuth access token has been revoked`; no child changes were used and no independent review is claimed.

Current compile-frontier state: _pickle_PicklerMemoProxy_copy_impl() now compiles past the C99 loop initializer under VC6. The next narrow frontier is load_next_buffer()'s C89 declaration-order defect at _pickle.c(5662). This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, Wine execution of Python, or real Windows 98 SE execution is claimed.

Latest revision (`_pickle.c` Pickler_traverse C89 declaration slice)

Baseline remains CPython v3.11.16 (commit 41388c9 in the pristine tag worktree). All port edits remain uncommitted in the nested cpython/ checkout; nothing was reset, cleaned, stashed, discarded, committed, pushed, or published.

The recorded _pickle.c frontier was re-probed before editing. save_set() remained clean; the first stable blocker was Pickler_traverse() at the later PyMemoTable *memo = self->memo; declaration after executable Py_VISIT() statements.

cpython/Modules/_pickle.c — hoisted PyMemoTable *memo; before the Py_VISIT() statements and changed the original declaration to memo = self->memo;. No later _pickle.c defect family was changed.
scripts/vc6-probe-pythoncore-frontier.test.sh — added the focused regression assertion for Pickler_traverse() declaration order.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from the nested git -C cpython diff; it applies cleanly to pristine v3.11.16.
PORT_STATUS.md — this report.

Exact command results:

Command	Result
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` before this slice	exit 2; `total=16 compiled=15 cached=0 skipped=0`; first blocker `_pickle.c(4725)`, `error C2143`, `PyMemoTable *memo = self->memo`.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after adding the focused assertion, before the source edit	exit 1 as required by TDD; the new `Pickler_traverse` assertion failed.
`bash scripts/vc6-probe-pythoncore-frontier.test.sh` after the source edit	exit 0, `ALL TESTS PASSED`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` after the source edit	exit 2; `Pickler_traverse()` is clean and the first blocker advances to `_pickle.c(4895)`, the C99 `for (size_t i = ...)` declaration in the next `_pickle.c` function; `total=16 compiled=15 cached=0 skipped=0`.
`bash -n scripts/vc6-probe-pythoncore-frontier.test.sh` plus public, core, PathCch, getpath, stdint, and frontier regression suites	exit 0; every suite reported `ALL TESTS PASSED`.
`git -C cpython diff --check`	exit 0.
pristine detached `v3.11.16` worktree `git apply --check` for the regenerated patch	exit 0; temporary worktree removed.

Current compile-frontier state: _pickle.c through Pickler_traverse() compiles cleanly under VC6. The next frontier is _pickle.c(4895), a distinct C89 declaration-order defect in a later for initializer. This remains compiler-probe progress only: no linked pythoncore.dll/python.exe, Wine execution of Python, or real Windows 98 SE execution is claimed.

Delegation note: the focused Claude Code lane was launched with the required no-commit/no-reset scope but exited without producing a usable report or changes; implementation and verification were performed directly, with no independent review claimed.

Baseline: CPython v3.11.16 Compiler: MSVC 6.0 (cl.exe 12.00.8804), from external MSVC600 Host test environment: Linux + Wine

Files changed in this revision (`_blake2/blake2b_impl.c` ULL-literal + declaration-order + `long long`/designated-initializer slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Modules/_blake2/impl/blake2b-ref.c — two separate slices, each re-probed individually before moving to the next:
- ULL/LL literal-suffix root blocker. Inventoried every C99 ULL/LL-suffixed integer literal in the file by grep (grep -n "ULL\|[0-9]LL\b"): the 8 blake2b_IV[8] initializer constants (lines 23-26) and 4 occurrences of ~0ULL/0ULL in blake2b_set_lastnode()/blake2b_clear_lastnode()/blake2b_set_lastblock()/blake2b_clear_lastblock() (lines 48, 54, 63, 71) — 12 literals total, and no others (blake2b_impl.c itself has one more at line 163, but it sits inside a dead #ifdef HAVE_BLAKE2S branch that is never defined in this port, so the C preprocessor only needs to recognize it as a pp-number token to skip it, not evaluate its suffix, and it was left alone). VC6's C89 front end rejects the C99 ULL/LL suffix spelling outright (error C2059: syntax error : 'bad suffix on number') but does accept the Microsoft-specific i64/ui64 64-bit literal suffixes. Rather than rewriting the literals to bare ui64 (a new, unreviewed spelling choice), every literal was routed through the existing PY_LL/PY_ULL macro pair already defined in PC/pyconfig.h for exactly this compiler (#define PY_ULL(x) x##ui64 when _MSC_VER < 1300, else x##ULL) — the same macro pair Include/pyport.h already anticipates via its own #ifndef PY_LL guard and accompanying comment ("see PC/pyconfig.h for the compilers that need something other than the C99 LL/ULL suffixes"), and the same defect family/fix shape as the earlier PY_LONG_LONG routing for _abc.c. blake2b-ref.c is #included from blake2b_impl.c after #include "Python.h", so PY_ULL is already visible by the time it is preprocessed; no new include was added. Every literal's digit value is unchanged — 0x6a09e667f3bcc908ULL became PY_ULL(0x6a09e667f3bcc908), ~0ULL became ~PY_ULL(0), etc. — this is a suffix-spelling change only, and it round-trips to the identical x##ULL expansion on every non-VC6 compiler, so no behavior change on any other target.
- C89 declaration-order fallout in the same file, the next diagnostic once the literal-suffix errors cleared: blake2b_init0() declared its for loop counter as a C99 for( int i = 0; ...) init-declaration, and blake2b_init_param() declared uint8_t *p after the blake2b_init0( S ) statement and used a second C99 for( size_t i = 0; ...) init-declaration. Both were hoisted to each function's opening declaration group (int i; / uint8_t *p; size_t i;), with every assignment left at its original execution point (p = (uint8_t *)(P); still runs right after blake2b_init0(S), in the same order) — the same hoist-and-reprobe pattern already used throughout this port (_abc.c, getpath.c, pystate.c). No control flow or arithmetic changed.
cpython/Modules/_blake2/blake2b_impl.c — two more of the previously-characterized-but-unfixed defect families, each re-probed individually:
- Changed unsigned long long node_offset (the py_blake2b_new_impl() parameter, line 94) to unsigned PY_LONG_LONG node_offset. VC6 has no long long keyword (error C2632: 'long' followed by 'long' is illegal); this is not a new port-local convention — CPython's own public headers already spell 64-bit unsigned parameters exactly this way for the same reason (e.g. Include/longobject.h's PyLong_FromUnsignedLongLong(unsigned PY_LONG_LONG) and PyLong_AsUnsignedLongLong). _PyLong_UnsignedLongLong_Converter() (the Argument Clinic-generated converter call site for this parameter) takes a void * out-parameter, so the declared-type change has no call-site ABI/type-mismatch implications.
- py_blake2b_dealloc(): hoisted PyTypeObject *type into the function's opening declaration group (previously declared, C89-illegally, after the lock-free and secure-zero statements); the assignment type = Py_TYPE(self); stays at its original point, immediately before PyObject_Free(self)/Py_DECREF(type), unchanged.
- blake2b_type_spec: converted from C99 designated initializers (.name = ..., .basicsize = ..., .flags = ..., .slots = ...) to plain positional initializers in PyType_Spec's declared field order from Include/object.h (name, basicsize, itemsize, flags, slots); the struct's initializer omitted itemsize, so the positional form spells that slot 0 explicitly, matching the implicit C99 zero-fill it already had. Same defect family and fix approach as _abc_data_type_spec/_abcmodule/_bisectmodule's PyModuleDef literals earlier in this port. Field values and order are unchanged.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff (4800 lines) so the project-local compatibility patch includes this _blake2/blake2b_impl.c slice plus all prior uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 worktree exited 0; the temporary worktree was removed afterward.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0 (each script individually) — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, stdint shim suite, and pythoncore frontier regression suite all passed with no regressions after this slice.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (before this revision's first edit)	exit 2 — confirmed the recorded first blocker reproduces exactly: bare `ULL` literal-suffix errors in `impl/blake2b-ref.c` (`error C2059: syntax error : 'bad suffix on number'`) as the first diagnostic for `Modules/_blake2/blake2b_impl.c`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the `PY_ULL`/`PY_LL` literal-suffix slice only)	exit 2 — every `ULL`-suffix diagnostic is gone. New first blocker: `cpython\Modules\_blake2\impl/blake2b-ref.c(143) : error C2143: syntax error : missing ';' before 'type'` (the `for( int i = ...)` C99 init-declaration in `blake2b_init0()`), with follow-on errors at lines 165/168-169 in `blake2b_init_param()`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the `blake2b-ref.c` declaration-order slice)	exit 2 — `impl/blake2b-ref.c` is now fully clean (no diagnostics reference it anymore). New first blockers, all in `Modules/_blake2/blake2b_impl.c`/its clinic header: `error C2632: 'long' followed by 'long' is illegal` at `clinic/blake2b_impl.c.h(18)`, `clinic/blake2b_impl.c.h(39)`, and `blake2b_impl.c(94)`; `error C2275: 'PyTypeObject' : illegal use of this type as an expression` at `blake2b_impl.c(397)`; and `error C2059: syntax error : '.'` at `blake2b_impl.c(412)`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the `unsigned PY_LONG_LONG` slice only)	exit 2 — all three `long long` diagnostics are gone; the `PyTypeObject`/designated-initializer diagnostics at lines 397/412 remain, confirming they are independent defects rather than parser-desync fallout.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the `py_blake2b_dealloc()`/`blake2b_type_spec` slice — final state this revision)	exit 2 — `Modules/_blake2/blake2b_impl.c` now compiles with zero errors and zero warnings; `total=6 compiled=5 cached=0 skipped=0`. The frontier advances to the next source in `pythoncore.vcxproj` order, `Modules/_blake2/blake2s_impl.c` (autogenerated from `blake2b_impl.c` per its own header comment), whose first blockers are the identical defect families mirrored into the `s`-variant files: C99 `for`-init-declarations in `impl/blake2s-ref.c` (lines 231, 275), `unsigned long long` in `clinic/blake2s_impl.c.h`(18,39)/`blake2s_impl.c`(94), a bare `ULL`-suffix literal at `blake2s_impl.c(163)` (`if (node_offset > 0xFFFFFFFFFFFFULL)`, guarded by `#ifdef HAVE_BLAKE2S` in `blake2b_impl.c` but not guarded in `blake2s_impl.c`, so it is live code there), and the same `PyTypeObject *type = Py_TYPE(self);`/designated-initializer pair at `blake2s_impl.c`(397)/(412). None of this has been fixed yet.
`bash scripts/vc6-probe-core.sh cpython/Modules/main.c`	exit 0 — still compiles cleanly after this slice.
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after this slice.
`git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython worktree remove ../build/verify-vc6-patch-worktree --force`	exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree; temporary worktree removed.

Current pythoncore compile-frontier status: Modules/_blake2/blake2b_impl.c (and its #included impl/blake2b-ref.c) is fully clean under the VC6 frontier probe (0 errors, 0 warnings), advancing the frontier past _abc.c, _bisectmodule.c, blake2module.c, and now blake2b_impl.c. The frontier has moved on to Modules/_blake2/blake2s_impl.c, whose first blocker set is the same defect families just fixed here, mirrored into the autogenerated s-variant sources — plus one new wrinkle: the 0xFFFFFFFFFFFFULL node-offset overflow check that sits inside a dead #ifdef HAVE_BLAKE2S branch in blake2b_impl.c (and so never needed fixing there) is not dead code in blake2s_impl.c, so its ULL suffix will need the same PY_ULL() treatment as a live diagnostic this time. Recommended next slice: mirror this revision's three sub-slices onto the s-variant files in the same order (literal suffixes in impl/blake2s-ref.c plus the live blake2s_impl.c(163) literal first, then blake2s-ref.c's C89 declaration-order fallout, then unsigned PY_LONG_LONG/PyTypeObject/designated-initializer in blake2s_impl.c/its clinic header), re-probing after each sub-slice as done here.

Caveat: this is still compile-probe work only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in previous revision (`compat/msvc600/stdint.h` shim + `_blake2/blake2module.c` slice)

All still uncommitted; nothing in this list has been pushed anywhere.

compat/msvc600/stdint.h — new VC6-scoped project-local compatibility header providing the missing C99 <stdint.h> that cpython/Modules/_blake2/impl/blake2.h and blake2-impl.h #include. Evidence before adding it: grepped every fixed-width-integer identifier (u?int(8|16|32|64)_t, u?intptr_t, u?int_least*_t, u?int_fast*_t, size_t) across the entire Modules/_blake2/ tree (both impl headers/sources and the blake2b_impl.c/blake2s_impl.c/clinic wrappers). The only fixed-width types actually used anywhere in that tree are uint8_t, uint32_t, and uint64_t (in load32/64/48, store32/64/48, rotl32/64, rotr32/64, and the reference block-compression loops); no int8_t/int16_t/int32_t/int64_t or intptr_t/uintptr_t appear at all. size_t is also used but is unaffected — it already comes from <stddef.h>, which VC6 has natively. Design: rather than re-declaring these three typedefs a second time under a second include guard, stdint.h forwards to the already-existing, already-verified compat/msvc600/inttypes.h (added in an earlier revision so CPython's own Include/pyport.h, which does #include <inttypes.h>, would compile) via #include "inttypes.h". inttypes.h's own include guard makes this forwarding idempotent regardless of which of the two headers a given translation unit reaches first, so a TU that ends up pulling in both Python.h (→ pyport.h → <inttypes.h>) and blake2.h (→ <stdint.h>) cannot hit a duplicate-typedef error. Width assumptions (unchanged, already relied on by inttypes.h): uint8_t = unsigned char (1 byte), uint32_t = unsigned long (4 bytes on Win32/ILP32), uint64_t = unsigned __int64 (VC6's non-standard 64-bit extension, 8 bytes) — verified sufficient by a compile-time fixture (below) using typedef char check[(sizeof(uint32_t)==4) ? 1 : -1];-style width assertions, since VC6 has no static_assert.
scripts/fixtures/vc6_stdint_smoke.c — new focused compile fixture: includes both <stdint.h> and <inttypes.h> in the same translation unit (reproducing the Python.h + blake2.h coexistence case), asserts sizeof(uint8_t)==1/sizeof(uint32_t)==4/sizeof(uint64_t)==8 at compile time, and exercises load32/load64/rotl32/rotl64 in the same shape blake2-impl.h uses.
scripts/vc6-probe-stdint.test.sh — new regression test for the shim and fixture under the VC6 probe, modeled directly on the existing scripts/vc6-probe-pathcch.test.sh (skips, not fails, when Wine/MSVC600 are unavailable).
cpython/Modules/_blake2/blake2module.c — with the <stdint.h> blocker gone, the file advanced to two blockers from defect families already fixed elsewhere in this port: (1) blake2_exec() declared PyObject *d = st->blake2b_type->tp_dict; after preceding statements (C89 mixed-declaration; VC6 requires declarations before statements) — hoisted PyObject *d; into the function's opening declaration group and changed the first assignment to plain d = ..., leaving the second assignment (d = st->blake2s_type->tp_dict;) unchanged since d was already in scope there; (2) the blake2_module PyModuleDef struct literal mixed a positional PyModuleDef_HEAD_INIT/"_blake2" prefix with C99 designated initializers (.m_doc = ... etc.) for the rest — converted to plain positional initializers in Include/moduleobject.h's declared field order (m_base, m_name, m_doc, m_size, m_methods, m_slots, m_traverse, m_clear, m_free), the same defect family and fix already used in _abc.c and _bisectmodule.c. Field values and order are unchanged — this is a spelling change only, not a behavior change.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff (4651 lines) so the project-local compatibility patch includes this stdint.h/blake2module.c slice plus all prior uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 worktree exited 0; the temporary worktree was removed afterward.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-stdint.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0 (each script individually) — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, new stdint shim suite, and pythoncore frontier regression suite all passed with no regressions after this slice.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (before this slice)	exit 2 — confirmed the recorded first blocker reproduces exactly: `cpython\Modules\_blake2\impl/blake2.h(18) : fatal error C1083: Cannot open include file: 'stdint.h': No such file or directory`. Summary: `total=4 compiled=3 cached=0 skipped=0`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after adding `compat/msvc600/stdint.h` only, before the `blake2module.c` source edits)	exit 2 — the missing-`stdint.h` fatal error is gone; new first blocker is `cpython\Modules\_blake2\blake2module.c(98) : error C2275: 'PyObject' : illegal use of this type as an expression` (C89 mixed-declaration) immediately followed by the `.m_doc = ...` designated-initializer `error C2059: syntax error : '.'` at line 145.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the `blake2module.c` slice)	exit 2 — `Modules/_blake2/blake2module.c` now compiles with zero errors and zero warnings. The frontier advances to the next source in `pythoncore.vcxproj` order, `Modules/_blake2/blake2b_impl.c`, whose new first blockers are a different defect family: bare `0ULL`/`64ULL`-style integer-literal suffixes in `Modules/_blake2/impl/blake2b-ref.c` (`error C2059: syntax error : 'bad suffix on number'` — VC6's C89 front end does not accept the C99 `ULL`/`LL` integer-constant suffixes at all, only `UL`/`L`/`U`), C99 mixed-declaration/`for`-init-declaration fallout in the same file, `unsigned long long` in `clinic/blake2b_impl.c.h` and `blake2b_impl.c` itself (the same `long long`-keyword gap already routed through `PY_LONG_LONG` elsewhere in this port), and a `PyTypeObject *type = ...` C89 mixed-declaration plus a `.` designated-initializer in `blake2b_impl.c`. None of this has been fixed yet. Summary: `total=5 compiled=4 cached=0 skipped=0`.
`bash scripts/vc6-probe-core.sh cpython/Modules/main.c`	exit 0 — still compiles cleanly after this slice.
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after this slice.
`git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython worktree remove ../build/verify-vc6-patch-worktree --force`	exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree; temporary worktree removed.

Current pythoncore compile-frontier status: Modules/_blake2/blake2module.c is fully clean under the VC6 frontier probe (0 errors, 0 warnings), advancing the frontier past _abc.c, _bisectmodule.c, and now blake2module.c. The frontier has moved on to Modules/_blake2/blake2b_impl.c (via its #included impl/blake2b-ref.c), whose first blocker is a new defect family for this port: VC6's C89 front end rejects the C99 ULL/LL unsigned-long-long integer-literal suffixes used throughout the BLAKE2 reference constants and IV tables. This is distinct from the already-solved long long keyword gap (PY_LONG_LONG) — it is about literal-suffix spelling, and will need either rewriting the affected literals (e.g. 0x6A09E667F3BCC908ULL → a PY_LONG_LONG-safe spelling, likely via a cast or an _LL/ui64-suffix substitution valid under VC6) or a targeted macro, plus the follow-on C89 declaration-order, long long-keyword, and designated-initializer fixes already characterized above in blake2b_impl.c and its clinic header. Recommended next slice: Modules/_blake2/impl/blake2b-ref.c's integer-literal suffixes first (it is the root blocker blake2b_impl.c #includes), then re-probe before touching blake2b_impl.c itself.

Caveat: this is still compile-probe work only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in previous revision (`_bisectmodule.c` designated-initializer slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Modules/_bisectmodule.c — converted the _bisectmodule PyModuleDef struct literal from C99 designated initializers (.m_name = ..., .m_size = ..., etc.) to plain positional initializers in the struct's declared field order (m_base, m_name, m_doc, m_size, m_methods, m_slots, m_traverse, m_clear, m_free, per Include/moduleobject.h). This is the same defect family and same fix approach already used twice in _abc.c (error C2059: syntax error : '.'; VC6 has no C99 designated-initializer support). The struct had no m_traverse initializer in the original, so the corresponding positional slot is NULL. Field values and order are otherwise unchanged — this is a spelling change only, not a behavior change. No declaration-order (C89 mixed-declaration) errors followed this fix; the file compiles clean end-to-end on the first re-probe.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff (4609 lines) so the project-local compatibility patch includes this _bisectmodule.c slice plus all prior uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 worktree exited 0; the temporary worktree was removed afterward.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0 (each script individually) — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed with no regressions after this slice.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (before this slice)	exit 2 — confirmed the recorded first blocker reproduces exactly: `cpython\Modules\_bisectmodule.c(329) : error C2059: syntax error : '.'` at `.m_name = "_bisect",` in the `_bisectmodule` `PyModuleDef` initializer.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after this slice)	exit 2 — `Modules/_bisectmodule.c` now compiles with zero errors and zero warnings (only the source-filename echo from `cl.exe`, same as a clean compile). The frontier advances to the next source in `pythoncore.vcxproj` order, `Modules/_blake2/blake2module.c`, whose new first blocker is `cpython\Modules\_blake2\impl/blake2.h(18) : fatal error C1083: Cannot open include file: 'stdint.h': No such file or directory` — a missing modern-C/SDK standard header, a different defect family from designated initializers or C89 declaration ordering, and not yet addressed here. Summary: `total=4 compiled=3 cached=0 skipped=0`.
`bash scripts/vc6-probe-core.sh cpython/Modules/main.c`	exit 0 — still compiles cleanly after this slice.
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after this slice.
`git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython worktree remove ../build/verify-vc6-patch-worktree --force`	exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree; temporary worktree removed.

Current pythoncore compile-frontier status: Modules/_bisectmodule.c is fully clean under the VC6 frontier probe (0 errors, 0 warnings), advancing the frontier past both _abc.c and _bisectmodule.c. The frontier has moved on to Modules/_blake2/blake2module.c, whose first blocker is a missing <stdint.h> (needed by Modules/_blake2/impl/blake2.h for fixed-width integer types like uint32_t/uint64_t). This is a new defect family — a missing standard/SDK header, not a source-level C89/C99 compatibility issue — and will likely need either a project-local stdint.h compatibility shim (similar in spirit to the existing compat/msvc600/pathcch.h shim) or a decision to exclude/stub the _blake2 module for this port, rather than a source-hoist slice. The recommended next step is to characterize the actual uint32_t/uint64_t/etc. usage in Modules/_blake2/impl/*.h before choosing between those two approaches.

Caveat: this is still compile-probe work only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in previous revision (`_abc.c` C89 declaration-hoist + designated-initializer slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Modules/_abc.c — advanced the _abc.c frontier past its full body with a sequence of small, individually re-probed slices:
- abc_data_dealloc(): hoisted PyTypeObject *tp before the PyObject_GC_UnTrack(self) statement (the exact line-67 blocker recorded at the start of this revision).
- _abc_data_type_spec and the _abcmodule PyModuleDef: converted from C99 designated initializers (.name = ..., .m_name = ..., etc.) to plain positional initializers in declared field order. VC6 has no C99 designated-initializer support at all (error C2059: syntax error : '.'); this is a different defect family from declaration-hoisting, so it is called out separately here. Field values and order are unchanged — this is a spelling change only, not a behavior change.
- _in_weak_set(), _add_to_weak_set(), _abc__get_dump(), compute_abstract_methods() (both for loops, including replacing their C99 for (Py_ssize_t pos = 0; ...) init-declarations with a function-scoped pos and hoisting per-iteration locals to the top of each loop body), set_collection_flag_recursive(), _abc__abc_register_impl(), _abc__abc_instancecheck_impl(), _abc__abc_subclasscheck_impl() (including its inner for loop over subclasses), and subclasscheck_check_registry() (including its inner for loop over the registry snapshot): hoisted all locals into each function's or block's opening declaration group, preserving every assignment at its original execution point (after argument validation, inside the same if/for/while branch, etc.). No control flow, lock/refcount ordering, or error-path behavior was changed anywhere in this slice.
- The previously reported "generated clinic/_abc.c.h struct-redefinition conflict around line 583" was characterized while fixing _abc__abc_instancecheck_impl() (whose opening declaration group sat at old line 583): it was parser-desync fallout from the preceding unfixed declaration-hoist errors, not a real redefinition. clinic/_abc.c.h itself is unmodified and is only 163 lines long; there is no struct redefinition in it. This matches the caveat already recorded about that hypothesis.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff (4583 lines) so the project-local compatibility patch includes this _abc.c slice plus all prior uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 worktree exited 0; the temporary worktree was removed afterward.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0 (each script individually) — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed with no regressions after this slice.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (before this slice)	exit 2 — confirmed the recorded first blocker reproduces exactly: `cpython\Modules\_abc.c(67) : error C2275: 'PyTypeObject' : illegal use of this type as an expression` at `PyTypeObject *tp = Py_TYPE(self);` in `abc_data_dealloc()`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after each incremental slice, ~10 live re-probes)	exit 2 each time until the final one — the first diagnostic advanced monotonically through `_abc.c`: line 67 (`abc_data_dealloc`) → line 109 designated-initializer `error C2059` (`_abc_data_type_spec`) → line 138 (`_in_weak_set`) → line 203 (`_add_to_weak_set`) → line 291 (`_abc__get_dump`) → line 311 (`compute_abstract_methods`) → line 507/512 (`set_collection_flag_recursive`) → line 537 (`_abc__abc_register_impl`) → line 612 (`_abc__abc_instancecheck_impl`) → line 695 (`_abc__abc_subclasscheck_impl`) → line 849 (`subclasscheck_check_registry`). Each slice was verified against the live VC6 frontier before moving to the next.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after the final `_abc.c` slice)	exit 2 — `Modules/_abc.c` now compiles with zero errors and zero warnings; `total=3 compiled=2 cached=0 skipped=0`. The frontier advances to the next source in `pythoncore.vcxproj` order, `Modules/_bisectmodule.c`, whose new first blocker is `cpython\Modules\_bisectmodule.c(329) : error C2059: syntax error : '.'` — the same C99 designated-initializer defect family just fixed twice in `_abc.c`, not yet fixed here.
`bash scripts/vc6-probe-core.sh cpython/Modules/main.c`	exit 0 — still compiles cleanly after this slice.
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after this slice.
`git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch && git -C cpython worktree remove ../build/verify-vc6-patch-worktree --force`	exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree; temporary worktree removed.

Current pythoncore compile-frontier status: Modules/_abc.c is fully clean under the VC6 frontier probe (0 errors, 0 warnings). The frontier has moved on to Modules/_bisectmodule.c, whose first blocker is a C99 designated-initializer struct literal (error C2059: syntax error : '.' at line 329), the same defect family already fixed twice above (_abc_data_type_spec, _abcmodule). The recommended next slice is _bisectmodule.c's designated initializer(s), followed by whatever C89 declaration-order issues follow in that file, using the same per-function hoist-and-reprobe approach used throughout this revision.

Caveat: this is still compile-probe work only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in previous revision (`_abc.c` frontier: `pycore_moduleobject.h` declaration-hoist + `long long` spelling)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Include/internal/pycore_moduleobject.h — hoisted _PyModule_GetDict()'s PyObject *dict declaration into the function's opening declaration group (C89/VC6 requires declarations before statements; the prior form declared dict after the assert(PyModule_Check(mod)); statement). The assignment stays at the original point, and the following assert(dict != NULL);/return are unchanged.
cpython/Modules/_abc.c — changed the two unsigned long long struct field declarations (_abcmodule_state.abc_invalidation_counter, _abc_data._abc_negative_cache_version) to unsigned PY_LONG_LONG. VC6 has no long long keyword at all (error C2632: 'long' followed by 'long' is illegal); CPython's own PC/pyconfig.h already defines PY_LONG_LONG to fall back to __int64 for _MSC_VER < 1300 (VC6) for exactly this reason. This routes through that existing, already-correct CPython compatibility macro instead of adding a new shim; no other files in the current frontier use the bare long long spelling.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff so the project-local compatibility patch includes this slice plus all prior uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0 (each script individually) — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed with no regressions after this slice.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (before this slice)	exit 2 — first blocker `cpython\Include\internal\pycore_moduleobject.h(33) : error C2143: syntax error : missing ';' before 'type'` at `PyObject dict = ((PyModuleObject )mod) -> md_dict;`, cascading into spurious `dict`-undeclared fallout plus `pycore_gc.h(15) : error C2061: syntax error : identifier 'uintptr_t'` and further undefined-struct fallout through `pycore_interp.h`, `pycore_global_objects.h`, `pycore_runtime.h`, and `pycore_object.h`, then `_abc.c` fallout until `fatal error C1003: error count exceeds 100`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after `pycore_moduleobject.h` hoist only)	exit 2 — confirms the hoist was the true root cause: every `pycore_gc.h`/`pycore_interp.h`/`pycore_global_objects.h`/`pycore_runtime.h`/`pycore_object.h` diagnostic is gone (those headers were never actually broken; VC6's error recovery from the single C89 syntax error had desynced parsing for the rest of the translation unit). New first blocker is `cpython\Modules\_abc.c(22) : error C2632: 'long' followed by 'long' is illegal` at `unsigned long long abc_invalidation_counter;`.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh` (after both fixes)	exit 2 — `_abc.c`'s `long long` blocker is gone. New first blocker is `cpython\Modules\_abc.c(67) : error C2275: 'PyTypeObject' : illegal use of this type as an expression` (a C89 mixed-declaration pattern, same family as already fixed repeatedly in `pystate.c`/`pylifecycle.c`/`getpath.c`), followed by many more declaration-order and declaration-after-statement errors throughout the rest of `_abc.c`'s ~35 functions until `fatal error C1003: error count exceeds 100` at line 784. Summary: `total=2 compiled=1 cached=0 skipped=0`.
`bash scripts/vc6-probe-core.sh cpython/Modules/main.c`	exit 0 — still compiles cleanly after this slice.
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after this slice.
`git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree.

Current pythoncore compile-frontier status: the frontier has advanced past the pycore_moduleobject.h/GC-header cascade and past _abc.c's long long blocker. Modules/_abc.c is now the active frontier file; the next blocker is a large set of C89 declaration-order violations spread across most of its functions (starting at line 67), plus at least one apparent struct-redefinition conflict with the Argument Clinic-generated clinic/_abc.c.h at line 583 that has not yet been individually characterized. This will need a multi-slice declaration-hoist pass through _abc.c, similar in shape to the pystate.c slices recorded below, rather than a single edit.

Caveat: this is still compile-probe work only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in previous revision (VC6 frontier `/D` string define transport)

All still uncommitted; nothing in this list has been pushed anywhere.

scripts/vc6-probe-pythoncore-frontier.sh — moved live VC6 compile arguments into per-object response files so quoted /D string literals no longer traverse wine cmd /c as inline command text. quote_define_for_cmd() now doubles define-owned backslashes before protecting literal quotes, so VPATH="..\\.." reaches CL preprocessing as the C string literal "..\\.."; empty-string defines such as PYDEBUGEXT="" are preserved. Added render_compile_command_for_test() as a safe no-Wine regression helper for define rendering.
scripts/vc6-probe-pythoncore-frontier.test.sh — added a list-only/no-toolchain assertion that checks rendered per-file string defines for VPATH, PYDEBUGEXT, and PLATLIBDIR before the optional live Wine/VC6 run.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command Result

bash -n scripts/vc6-probe.test.sh scripts/vc6-probe-core.test.sh scripts/vc6-probe-pathcch.test.sh scripts/generate-getpath-frozen.test.sh scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-pythoncore-frontier.sh scripts/generate-getpath-frozen.sh scripts/vc6-probe-minlink.sh scripts/vc6-probe-core.sh scripts/vc6-probe.sh && bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh exit 0 — shell syntax plus public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed.

VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh exit 2 — Modules/getpath.c now compiles cleanly under the forced frontier. The frontier advances to Modules/_abc.c; first exact blocker is cpython\\Include\\internal\\pycore_moduleobject.h(33) : error C2143: syntax error : missing ';' before 'type', followed by dict undeclared fallout, missing/undefined GC internals beginning with pycore_gc.h(15) : error C2061: syntax error : identifier 'uintptr_t', and then _abc.c VC6/C89/modern-C fallout until fatal error C1003: error count exceeds 100. Summary: total=2 compiled=1 cached=0 skipped=0.

Current pythoncore compile-frontier status: the quoted macro transport blocker is resolved in the harness, and the frontier has advanced past Modules/getpath.c. The next actionable blocker is now in shared internal headers reached while compiling Modules/_abc.c, starting with C89 declaration ordering in pycore_moduleobject.h and missing/unsupported GC typedef structure (uintptr_t / PyGC_Head) fallout.

Caveat: this is still compile-probe work only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in previous revision (`getpath.c` _PyConfig_InitPathConfig C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Modules/getpath.c — advanced _PyConfig_InitPathConfig() past the first main-body VC6/C89 declaration-order blocker by hoisting active locals (configDict, dict, co, Windows-only winreg, and r) into the function opening declaration group. Assignments remain at their original execution points after _PyPathConfig_ReadGlobal(), early status/compute_path_config return, and GIL check; refcount cleanup, winreg fallback handling, code evaluation, _PyConfig_FromDict(), and return statuses are unchanged. Disabled #if 0 debug locals were left untouched.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff so the compatibility patch includes this _PyConfig_InitPathConfig() declaration-hoist slice plus prior uncommitted compatibility edits.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0 — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh`	exit 2 — `_PyConfig_InitPathConfig()` now gets past the prior line-887 `PyObject *configDict = _PyConfig_AsDict(config);` blocker, plus the follow-on `dict`, `co`, Windows `winreg`, and `r` declaration-order blockers. New exact first blocker is `build\generated\cpython\Modules\getpath.c(956) : error C2001: newline in constant` at `!decode_to_dict(dict, "VPATH", VPATH)`, followed by adjacent newline-in-constant diagnostics for `PLATLIBDIR`, `PYDEBUGEXT`, and `PYWINVER`, then parse fallout. Summary: `total=1 compiled=0 cached=0 skipped=0`.
`git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree.

Current pythoncore compile-frontier status: the requested _PyConfig_InitPathConfig() declaration-order slice is complete and verified. The frontier still starts at Modules/getpath.c, but the next blocker has advanced from C89 declarations to quoted macro/value handling in the initial-value dictionary expression.

Caveat: this is still compile-probe work only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in this revision (`getpath.c` first VC6/C89 helper slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Modules/getpath.c — advanced the first Modules/getpath.c pythoncore frontier slice by moving early helper declarations to C89/VC6-safe declaration groups while preserving assignment timing after argument parsing and other checks. Covered getpath_abspath(), getpath_basename(), getpath_dirname(), getpath_hassuffix(), Windows file-attribute helpers (isdir/isfile/isxfile), getpath_joinpath(), getpath_readlines(), funcs_to_dict(), decode_to_dict(), env_to_dict(), and winmodule_to_dict().
cpython/Modules/getpath.c — added a narrow VC6/old-SDK fallback for missing INVALID_FILE_ATTRIBUTES, guarded as defined(_MSC_VER) && _MSC_VER < 1300 && !defined(INVALID_FILE_ATTRIBUTES) under MS_WINDOWS after including <windows.h>.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff so the project-local compatibility patch includes this getpath.c slice plus prior uncommitted compatibility edits.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0 — public probe suite, core probe suite, PathCch shim suite, getpath frozen-header generator suite, and pythoncore frontier regression suite all passed.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh`	exit 2 — `Modules/getpath.c` gets past the prior line-66 `Py_ssize_t len` blocker, the immediate helper declaration-order blockers, and the old-SDK `INVALID_FILE_ATTRIBUTES` blocker. New exact first blocker is `build\\generated\\cpython\\Modules\\getpath.c(887) : error C2275: 'PyObject' : illegal use of this type as an expression` at `PyObject *configDict = _PyConfig_AsDict(config);` in `_PyConfig_InitPathConfig()`, followed by the same function's later C89 declaration-order fallout. Summary: `total=1 compiled=0 cached=0 skipped=0`.
`git -C cpython worktree add --detach ../build/verify-vc6-patch-worktree v3.11.16 && git -C build/verify-vc6-patch-worktree apply --check ../../compat/msvc600/cpython-3.11.16-vc6-headers.patch`	exit 0 — regenerated compatibility patch applies cleanly to a pristine detached `v3.11.16` worktree.

Current pythoncore compile-frontier status: the first bounded getpath.c helper declaration-order/old-SDK slice is complete and verified. The frontier still starts at Modules/getpath.c, but the next blocker has advanced into _PyConfig_InitPathConfig()'s main path-calculation body.

Caveat: this is still compile-probe work only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in this revision (generated `getpath.h` provisioning)

All still uncommitted; nothing in this list has been pushed anywhere.

scripts/generate-getpath-frozen.sh — new reproducible project-local generation step for Python/frozen_modules/getpath.h. It invokes CPython's documented Programs/_freeze_module.py getpath Modules/getpath.py ... path with host python3 and writes only to ignored build/generated/cpython/Python/frozen_modules/getpath.h.
scripts/generate-getpath-frozen.test.sh — new regression coverage for the generated path and header format: verifies the _freeze_module.py banner, _Py_M__getpath symbol, 16-byte line formatting, unmarshaled <frozen getpath> code object, and byte-for-byte equality with a direct Programs/_freeze_module.py invocation.
scripts/vc6-probe-pythoncore-frontier.sh — now provisions the generated getpath header before live VC6 compilation and compiles Modules/getpath.c from an ignored generated cpython-shaped source copy so its relative ../Python/frozen_modules/getpath.h include resolves without tracking generated output.
scripts/vc6-probe-pythoncore-frontier.test.sh — live integration check now rejects a stale missing-getpath.h blocker and verifies the frontier harness created the ignored generated header.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command Result

chmod +x scripts/generate-getpath-frozen.sh scripts/generate-getpath-frozen.test.sh scripts/vc6-probe-pythoncore-frontier.sh && bash -n scripts/generate-getpath-frozen.sh scripts/generate-getpath-frozen.test.sh scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh && bash scripts/generate-getpath-frozen.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh exit 0 — generator format/path regression passed and frontier regression passed, including live provisioning of build/generated/cpython/Python/frozen_modules/getpath.h.

VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh exit 2 — Modules/getpath.c now gets past both <pathcch.h> and the generated ../Python/frozen_modules/getpath.h include. It stops at the next honest VC6/C89 compile blocker: mixed declarations in getpath.c, first diagnostic build\\generated\\cpython\\Modules\\getpath.c(66) : error C2275: 'Py_ssize_t' : illegal use of this type as an expression, followed by more declaration-order errors and INVALID_FILE_ATTRIBUTES not being declared before the compiler reaches its 100-error cap. Summary: total=1 compiled=0 cached=0 skipped=0.

Current pythoncore compile-frontier status: generated frozen getpath.h is now reproducibly provisioned from CPython source into ignored build output and integrated into the frontier harness. The current first blocker remains Modules/getpath.c, now at VC6/C89 declaration-order and old-SDK constant compatibility work rather than missing generated input.

Caveat: this is still compile-probe work only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in previous revision (VC6 `PathCchFindExtension` shim)

All still uncommitted; nothing in this list has been pushed anywhere.

compat/msvc600/pathcch.h — new VC6-scoped project-local compatibility header that implements only PathCchFindExtension(PCWSTR, size_t, PCWSTR *) for the existing Modules/getpath.c use. It scans a null-terminated wide path within cchPath, returns the last . after the last \\, /, or : separator, returns the terminating NUL when no extension is present, and returns E_INVALIDARG for null arguments, zero cchPath, or a too-small count with no NUL.
scripts/fixtures/vc6_pathcch_smoke.c — focused compile fixture covering .exe, no extension, a dot in a directory name, dotfiles, trailing directory separators, multiple suffixes, and invalid/too-small arguments.
scripts/vc6-probe-pathcch.test.sh — new regression test for the shim and fixture under the VC6 probe when Wine/MSVC600 are available.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`chmod +x scripts/vc6-probe-pathcch.test.sh && bash -n scripts/vc6-probe-pathcch.test.sh scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-minlink.sh scripts/vc6-probe-core.sh scripts/vc6-probe.sh`	exit 0
`bash scripts/vc6-probe-pathcch.test.sh`	exit 0, `ALL TESTS PASSED` — 4/4 checks `ok`; the smoke fixture compiles under VC6 and no longer hits missing `pathcch.h`.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pathcch.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0 — public probe suite, core probe suite, pathcch smoke suite, and frontier regression suite all passed.
`VC6_FRONTIER_FORCE=1 bash scripts/vc6-probe-pythoncore-frontier.sh`	exit 2 — `Modules/getpath.c` now gets past `<pathcch.h>` and stops at the next honest blocker: `cpython\\Modules\\getpath.c(22) : fatal error C1083: Cannot open include file: '../Python/frozen_modules/getpath.h': No such file or directory`. Summary: `total=1 compiled=0 cached=0 skipped=0`.

Current pythoncore compile-frontier status: the narrow PathCchFindExtension compatibility needed by Modules/getpath.c is implemented and verified under VC6 compile probes. The next blocker in full project order is the missing generated/frozen header Python/frozen_modules/getpath.h required by Modules/getpath.c; this is separate from the PathCch API gap. No CompareStringOrdinal blocker has been reached yet.

Caveat: this is still compile-probe work only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in previous revision (source-list-driven pythoncore compile frontier)

All still uncommitted; nothing in this list has been pushed anywhere.

scripts/vc6-probe-pythoncore-frontier.sh — new project-local pythoncore compile-frontier harness. It parses cpython/PCbuild/pythoncore.vcxproj's 198 <ClCompile> entries, normalizes Windows-style paths to project-local cpython/... paths, compiles supported sources incrementally, preserves common/per-file defines, reports external/generated sources, and stops on the first VC6 front-end blocker with cl.exe's real status.
scripts/vc6-probe-pythoncore-frontier.test.sh — new regression test covering source-list parsing, path normalization, per-file define preservation, unsupported/generated/external reporting, and a bounded live first-source VC6 run when Wine/MSVC600 are present.
PORT_STATUS.md — that revision.

Command results (previous revision):

Command	Result
`for f in scripts/vc6-probe-pythoncore-frontier.sh scripts/vc6-probe-pythoncore-frontier.test.sh scripts/vc6-probe-minlink.sh scripts/vc6-probe-core.sh; do bash -n "$f"
`bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0, `ALL TESTS PASSED` — 12/12 checks `ok`
`bash scripts/vc6-probe-pythoncore-frontier.sh`	exit 2 — generated the source list, began with `cpython/Modules/getpath.c`, preserved its per-file defines, invoked VC6 `cl.exe`, and stopped truthfully at the first blocker: missing `pathcch.h` at `Modules/getpath.c(14)`.
`bash scripts/vc6-probe.test.sh && bash scripts/vc6-probe-core.test.sh && bash scripts/vc6-probe-pythoncore-frontier.test.sh`	exit 0 — public probe suite, core probe suite, and new frontier suite all passed.
`bash scripts/vc6-probe-minlink.sh`	exit 96 — unchanged minimal link-frontier behavior: all four selected translation units compile, then `LINK.EXE` fails with `fatal error LNK1120: 267 unresolved externals`.

Previous pythoncore compile-frontier status: source-list-driven frontier infrastructure was implemented and verified. The first actionable VC6 compile blocker in full project order was Modules/getpath.c requiring pathcch.h, a modern Windows SDK header not present in the VC6/MSVC600 include set.

Caveat: this was a compile-frontier harness only. No full pythoncore.dll/python.exe build, no successful link, no Wine launch, and no Windows 98 runtime execution was claimed.

Files changed in previous revision (minimal VC6 link-frontier probe)

All still uncommitted; nothing in this list has been pushed anywhere.

scripts/vc6-probe-minlink.sh — new project-local link-frontier harness. It reuses the existing Wine/MSVC600 helpers, compiles Programs/python.c plus the three currently clean core translation units (Modules/main.c, Python/pylifecycle.c, and Python/pystate.c) with pythoncore-style core/shared defines, then invokes VC6 LINK.EXE for a minimal python-min.exe attempt. This is intentionally not a full pythoncore.vcxproj build; pythoncore.vcxproj lists 198 C sources (without externals disabled: plus zlib-conditioned entries), while python.vcxproj only contributes Programs/python.c and references the core project.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe-minlink.sh`	exit 96 — all four frontier translation units compile under VC6, then `LINK.EXE` runs and fails truthfully with `fatal error LNK1120: 267 unresolved externals`. First unresolved symbols include `__PyPathConfig_ComputeSysPath0` / `__PyPathConfig_UpdateGlobal` (`Python/pathconfig.c`), `__Py_Dealloc` (`Objects/object.c`), `_PyErr_Print` (`Python/pythonrun.c`), and `PyStatus_Ok` (`Python/initconfig.c`).
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — existing core compile-probe regression checks still pass after adding the link-frontier script

Current minimal-link status: the first post-core-probe link milestone is now implemented as a reproducible harness that reaches the VC6 linker. A successful link is not feasible from only the already-clean TUs: the exact blocker is the expected unresolved-symbol frontier caused by not yet compiling the rest of pythoncore.vcxproj's source graph. Recommended next artifact is a source-list-driven VC6 pythoncore compile frontier (generate/consume the pythoncore.vcxproj <ClCompile> list, with per-file defines such as getpath.c and sysmodule.c handled explicitly) that compiles additional core objects one at a time before attempting a real pythoncore/python.exe link.

Caveat: this is a link-frontier probe only. No pythoncore.dll/full python.exe build, no Wine launch, and no Windows 98 runtime execution is claimed.

Files changed in previous revision (`pystate.c` final tail helper C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — _Py_GetConfig() now declares PyThreadState *tstate in the function opening declaration group while preserving the assert(PyGILState_Check()) before assigning tstate = _PyThreadState_GET(). push_chunk() now declares _PyStackChunk *new and PyObject **res in its opening declaration group while preserving the allocation-size loop, allocate_chunk(...) assignment point, chunk linking/top/limit updates, root-chunk offset, and returned stack pointer. _PyThreadState_PopFrame() now declares PyObject **base in the function opening declaration group while preserving the datastack assertion before assigning base = (PyObject **)frame, plus the chunk-pop and top-reset paths. _PyThreadState_BumpFramePointerSlow()'s inner block declaration was not changed.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff (3703 lines); includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` compiles cleanly end-to-end (compile-only)
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the final tail-helper declaration-hoist slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 0 — gets past the prior line 3405 (`PyThreadState tstate = _PyThreadState_GET();`) blocker in `_Py_GetConfig()`, the `push_chunk()` declaration-order blockers at line 3418 (`_PyStackChunk new = allocate_chunk(...)`) and line 3431 (`PyObject res = &new->data[...]`), and the follow-on line 3460 (`PyObject base = (PyObject **)frame;`) blocker in `_PyThreadState_PopFrame()`. No next C89 declaration blocker is currently exposed by the `pystate.c` compile probe; the only diagnostic left in this probe output is the pre-existing line 3361 warning (`warning C4550: expression evaluates to a function which is missing an argument list`).
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pystate.c` PyGILState_Check/Ensure C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — hoists PyGILState_Check()'s PyThreadState *tstate into the function opening declaration group while preserving the early check_enabled and TSS-created returns before assigning tstate = _PyRuntimeGILState_GetThreadState(gilstate). PyGILState_Ensure() now declares PyThreadState *tcur and int current in the opening declaration group, keeps tcur = PyThread_tss_get(...) after the initialization assertions, and leaves the new/current thread-state branches, restore/save ordering, counter update, and return value unchanged.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the `PyGILState_Check()`/`PyGILState_Ensure()` declaration-hoist slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior line 2886 (`error C2275: 'PyThreadState' : illegal use of this type as an expression`) blocker at `PyThreadState tstate = _PyRuntimeGILState_GetThreadState(gilstate);` in `PyGILState_Check()` and the adjacent `PyGILState_Ensure()` declaration-order fallout. New exact first blocker is line 3052 (`error C2059: syntax error : '{'`) at `data = (_PyCrossInterpreterData){0};` in `_PyObject_GetCrossInterpreterData()`, followed by line 3057 `crossinterpdatafunc getdata = _lookup_getdata(obj);`, line 3062 `int res = getdata(obj, data);`, and later cross-interpreter-data helper declaration-order fallout.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pystate.c` frame access and async-exception C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — hoists PyThreadState_GetFrame()'s _PyInterpreterFrame *f and PyFrameObject *frame declarations into the function's opening declaration group while preserving the f = tstate->cframe->current_frame assignment immediately after the assert and the frame = _PyFrame_GetFrameObject(f) assignment after the NULL check. PyThreadState_SetAsyncExc() now declares PyThreadState *tstate in the function opening group and uses for (tstate = ...; ...); its loop body declares PyObject *old_exc before the skip check and assigns it at the original point before the async exception replacement, preserving head-lock traversal, skip behavior, unlock-before-decref, signal, and return paths.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 32/32 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the frame access and async-exception declaration-hoist slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior `PyThreadState_GetFrame()` blockers at line 2457 (`_PyInterpreterFrame f = tstate->cframe->current_frame;`) and line 2464 (`PyFrameObject frame = _PyFrame_GetFrameObject(f);`), plus `PyThreadState_SetAsyncExc()`'s C99 `for (PyThreadState tstate = ...)` initializer and post-`if` `PyObject old_exc` loop-body declaration. New exact first blocker is line 2576 (`error C2275: 'PyObject' : illegal use of this type as an expression`) at `PyObject *result = PyDict_New();` in `_PyThread_CurrentFrames()`, followed by line 2582 (`int gc_was_enabled = PyGC_Disable();`) and later declaration-order fallout.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pystate.c` thread-state deletion helpers C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — hoists the thread-state deletion helper locals needed by VC6/C89: tstate_delete_common() now declares PyInterpreterState *interp, _PyRuntimeState *runtime, and _PyStackChunk *chunk in the opening declaration group while assigning them at their original post-ensure/post-TSS points; _PyThreadState_DeleteCurrent() declares struct _gilstate_runtime_state *gilstate before _Py_EnsureTstateNotNULL() and assigns it immediately after; _PyThreadState_DeleteExcept() declares PyThreadState *list, p, and next before HEAD_LOCK(runtime) while preserving the locked list capture/unlinking and post-unlock clear/free loop. The stack-chunk loop's block-local prev remains at the start of its while block.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 32/32 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the thread-state deletion helper declaration-hoist slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior `tstate_delete_common()` blockers at line 2245 (`PyInterpreterState interp = tstate->interp;`), line 2249 (`_PyRuntimeState runtime = interp->runtime;`), and line 2268 (`_PyStackChunk chunk = tstate->datastack_chunk;`), plus `_PyThreadState_DeleteCurrent()`'s post-ensure `gilstate` declaration and `_PyThreadState_DeleteExcept()`'s post-lock `list` declaration. New exact first blocker is line 2457 (`error C2143: syntax error : missing ';' before 'type'`) at `_PyInterpreterFrame f = tstate->cframe->current_frame;` in `PyThreadState_GetFrame()`, followed by line 2464 (`PyFrameObject *frame = _PyFrame_GetFrameObject(f);`) and later declaration-order fallout.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pystate.c` new_threadstate C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — hoists new_threadstate()'s PyThreadState *new_tstate, uint64_t id, and PyThreadState *old_head declarations into the function's opening declaration group. new_tstate = alloc_threadstate() remains before the lock, id = interp->threads.next_unique_id remains after the locked increment, and old_head = interp->threads.head remains immediately before the old_head == NULL branch, preserving allocation-before-lock, used_newtstate behavior, initialization branches, and lock/unlock order.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 32/32 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the `new_threadstate()` declaration-hoist slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior `new_threadstate()` blockers at line 1970 (`uint64_t id = interp->threads.next_unique_id;`) and line 1973 (`PyThreadState old_head = interp->threads.head;`). New exact first blocker is line 2080 (`error C2275: 'PyInterpreterState' : illegal use of this type as an expression`) at `PyInterpreterState interp = tstate->interp;` in `_PyState_AddModule()`, followed by declaration-order fallout for `interp` and later locals.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pystate.c` _PyInterpreterState_IDDecref C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — hoists _PyInterpreterState_IDDecref()'s struct _gilstate_runtime_state *gilstate, int64_t refcount, PyThreadState *tstate, and PyThreadState *save_tstate declarations to the function's opening declaration group. gilstate = &_PyRuntime.gilstate remains immediately after the id_mutex assert; refcount = interp->id_refcount remains after the decrement while the mutex is still held; tstate and save_tstate assignments remain inside the refcount == 0 && interp->requires_idref block, preserving lock acquisition/release plus _PyThreadState_Swap()/Py_EndInterpreter() ordering.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the `_PyInterpreterState_IDDecref()` declaration-hoist slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior `_PyInterpreterState_IDDecref()` blockers at line 1812 (`struct _gilstate_runtime_state gilstate = &_PyRuntime.gilstate;`), line 1816 (`int64_t refcount = interp->id_refcount;`), and the block-local `tstate`/`save_tstate` declarations. New exact first blocker is line 1876 (`error C2143: syntax error : missing ';' before 'type'`) at `_PyStackChunk res = _PyObject_VirtualAlloc(size_in_bytes);` in `allocate_chunk()`, followed by declaration-order fallout for `res`.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pystate.c` PyInterpreterState_Get C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — hoists PyInterpreterState_Get()'s PyInterpreterState *interp declaration beside the existing PyThreadState *tstate local. tstate = _PyThreadState_GET() remains immediately before _Py_EnsureTstateNotNULL(tstate), and interp = tstate->interp remains at the original post-ensure point, preserving the fatal-error check and return behavior.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the `PyInterpreterState_Get()` declaration-hoist slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior `PyInterpreterState_Get()` blocker at line 1719 (`PyInterpreterState interp = tstate->interp;`). New exact first blocker is line 1812 (`error C2143: syntax error : missing ';' before 'type'`) at `struct _gilstate_runtime_state gilstate = &_PyRuntime.gilstate;` in `_PyInterpreterState_IDDecref()`, followed by line 1816 `int64_t refcount = interp->id_refcount;` and later declaration-order fallout.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pystate.c` PyInterpreterState_Delete C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — hoists PyInterpreterState_Delete()'s PyInterpreterState **p declaration beside the existing runtime and interpreters locals. The for (p = &interpreters->head; ...) initializer remains under HEAD_LOCK(runtime), preserving the unlink search, remaining-thread checks, main-interpreter checks, assignment to *p, and lock/unlock ordering.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the `PyInterpreterState_Delete()` declaration-hoist slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior `PyInterpreterState_Delete()` blocker at line 1638 (`PyInterpreterState *p;`). New exact first blocker is line 1719 (`error C2275: 'PyInterpreterState' : illegal use of this type as an expression`) at `PyInterpreterState interp = tstate->interp;` in `PyInterpreterState_Get()`, followed by declaration-order fallout in the same and later functions.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pystate.c` interpreter_clear C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — hoists interpreter_clear()'s PyThreadState *p declaration beside the existing _PyRuntimeState *runtime local. The p = interp->threads.head; assignment remains at the same point under HEAD_LOCK(runtime), preserving the lock/unlock ordering and the thread-clear loop behavior.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the `interpreter_clear()` declaration-hoist slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior `interpreter_clear()` blocker at line 1537 (`PyThreadState p = interp->threads.head;`). New exact first blocker is line 1638 (`error C2275: 'PyInterpreterState' : illegal use of this type as an expression`) at `PyInterpreterState *p;` in `PyInterpreterState_Delete()`, followed by declaration-order fallout in the same and later functions.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pystate.c` PyInterpreterState_New C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — hoists PyInterpreterState_New()'s PyThreadState *tstate, PyThread_type_lock pending_lock, _PyRuntimeState *runtime, struct pyinterpreters *interpreters, int64_t id, and PyInterpreterState *old_head declarations into the function's opening declaration group. tstate = _PyThreadState_GET() remains immediately before the audit, and the pending_lock, runtime, interpreters, id, and old_head assignments stay at the original execution points after the audit, after lock allocation succeeds, after HEAD_LOCK(runtime), and before the old_head == NULL test respectively.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the `PyInterpreterState_New()` declaration-hoist slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior `PyInterpreterState_New()` blockers at line 1438 (`PyThread_type_lock pending_lock = PyThread_allocate_lock();`) and its `runtime`, `interpreters`, `id`, and `old_head` declaration-order fallout. New exact first blocker is line 1537 (`error C2275: 'PyThreadState' : illegal use of this type as an expression`) at `PyThreadState *p = interp->threads.head;` in `interpreter_clear()`, followed by later declaration-order fallout in the same translation unit.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pystate.c` alloc_for_runtime lock C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pystate.c — hoists alloc_for_runtime()'s PyThread_type_lock lock1, lock2, and lock3 declarations beside PyMemAllocatorEx old_alloc. The three PyThread_allocate_lock() calls remain at their original execution points as assignments; the existing NULL checks, lock1/lock2 cleanup order, allocator restoration, output assignments, and return paths are unchanged.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the `pystate.c` lock declaration slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior `alloc_for_runtime()` blockers at lines 1185/1190/1196 (`PyThread_type_lock lock1/lock2/lock3 = PyThread_allocate_lock();`). New exact first blocker is line 1438 (`error C2275: 'PyThread_type_lock' : illegal use of this type as an expression`) at `PyThread_type_lock pending_lock = PyThread_allocate_lock();` in `PyInterpreterState_New()`, followed by that function's `runtime`, `interpreters`, `id`, and `old_head` declaration-order fallout.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pycore_frame.h` frame inline C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Include/internal/pycore_frame.h — hoists the first VC6/C89 mixed-declaration blockers exposed while compiling Python/pystate.c: _PyFrame_GetFrameObject() now declares PyFrameObject *res before the assert() and assigns frame->frame_obj at the original point; _PyThreadState_BumpFramePointer() keeps _PyInterpreterFrame *res scoped inside the stack-space if block but declares it before the assignment; _PyFrame_GetGenerator() declares size_t offset_in_gen before the assert() and assigns offsetof(PyGenObject, gi_iframe) at the original point.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary v3.11.16 cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — still compiles cleanly after the header slice
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — gets past the prior `pycore_frame.h` blockers at `_PyFrame_GetFrameObject()`, `_PyThreadState_BumpFramePointer()`, and `_PyFrame_GetGenerator()`. New exact first blocker is line 1185 (`error C2275: 'PyThread_type_lock' : illegal use of this type as an expression`) at `PyThread_type_lock lock1 = PyThread_allocate_lock();` in `threadstate_update_waiting_for_thread_shutdown()`, followed by the same function's `lock2` and `lock3` declaration-order fallout.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` call_ll_exitfuncs C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists call_ll_exitfuncs()'s void (*exitfunc)(void) declaration before the loop and assigns it at the original post-decrement point, preserving the decrement, slot clearing, LIFO invocation order, and final stdout/stderr flushes.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 0 — gets past the prior line 3045 `void (*exitfunc)(void) = runtime->exitfuncs[runtime->nexitfuncs];` blocker in `call_ll_exitfuncs()`; no next `pylifecycle.c` blocker was found because the translation unit now compiles cleanly in the VC6 core compile probe.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` fatal_error/_Py_FatalErrorFormat C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists fatal_error() locals (runtime, tstate, interp, tss_tstate, and has_tstate_and_gil) into the function declaration area while preserving the original assignment/evaluation points, including runtime = &_PyRuntime, interp = NULL, tss_tstate = PyGILState_GetThisThreadState(), and the has_tstate_and_gil boolean assignment. _Py_FatalErrorFormat() now declares stream, fd, and vargs before its reentrancy check, then assigns stream = stderr and fd = fileno(stream) at the original post-reentrancy point before output begins.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 2866 `_PyRuntimeState runtime = &_PyRuntime;` blocker in `fatal_error()` plus the immediately adjacent `tstate`/`interp`/`tss_tstate`/`has_tstate_and_gil` declaration-order fallout and `_Py_FatalErrorFormat()`'s `FILE stream`, `fd`, and `va_list vargs` mixed declarations. New exact first blocker is line 3045 (`error C2143: syntax error : missing ';' before 'type'`) at `void (*exitfunc)(void) = runtime->exitfuncs[runtime->nexitfuncs];` in `call_ll_exitfuncs()`.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` fatal-error dump C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists fatal_error_dump_runtime()'s PyThreadState *finalizing to the function declaration area and assigns it at the original point after the PUTS() call. _Py_DumpExtensionModules() now declares its function-scope locals (modules, pos, key, value, stdlib_module_names, header, and count) before the interp == NULL early return; the modules, stdlib_module_names, header, and count initializers are preserved as assignments at their original execution points. The inner is_stdlib_ext, i, item, and hash block declarations are unchanged.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ tree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 2698 `PyThreadState finalizing = _PyRuntimeState_GetFinalizing(runtime);` blocker in `fatal_error_dump_runtime()` and the adjacent `_Py_DumpExtensionModules()` function-scope declaration-order blockers. New exact first blocker is line 2866 (`error C2275: '_PyRuntimeState' : illegal use of this type as an expression`) at `_PyRuntimeState runtime = &_PyRuntime;` in `fatal_error()`, followed by additional `fatal_error()` declaration-order fallout.
`git apply --check compat/msvc600/cpython-3.11.16-vc6-headers.patch` against pristine `v3.11.16` tree	exit 0

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` is_valid_fd platform-branch C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists is_valid_fd()'s platform-branch locals into the function declaration area under the same preprocessor ladder: int fd2 for the Linux dup() branch, HANDLE hfile for MS_WINDOWS, and struct stat st for the fallback branch. The existing fd < 0 early return, platform conditions, and branch behavior are unchanged; the original declaration sites now only assign/use (fd2 = dup(fd), _get_osfhandle(), and fstat(fd, &st)).
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 2296 `HANDLE hfile;` blocker in `is_valid_fd()`. New exact first blocker is line 2403 (`error C2275: 'PyObject' : illegal use of this type as an expression`) at `PyObject encoding_str = PyUnicode_FromWideChar(encoding, -1);` in `create_stdio()`, followed by line 2409 `PyObject errors_str = PyUnicode_FromWideChar(errors, -1);` and later declaration-order blockers.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` add_main_module shadowed-loader C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists PyObject *bimod and a distinct PyObject *loader_obj into add_main_module()'s existing declaration group. The builtins import and BuiltinImporter lookup remain at their original execution points; the outer borrowed loader variable and its NULL/Py_None test are unchanged, while loader_obj carries only the formerly shadowed strong reference through its NULL check, __loader__ dict set, and decref.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 2212 `PyObject bimod = PyImport_ImportModule("builtins");` blocker and the same function's formerly shadowed line 2233 `PyObject loader = PyObject_GetAttrString(...)` declaration-order blocker in `add_main_module()`. New exact first blocker is line 2296 (`error C2275: 'HANDLE' : illegal use of this type as an expression`) at `HANDLE hfile;` in `is_valid_fd()`, followed by later declaration-order blockers in `create_stdio()` and finalization diagnostics.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` finalize_modules C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists int verbose and PyObject *weaklist to the top declaration group in finalize_modules(). verbose is assigned after the existing modules == NULL early return, and weaklist is assigned at the original finalize_remove_modules(modules, verbose) call site, preserving early-return behavior and call order.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 1606 `int verbose = _PyInterpreterState_GetConfig(interp)->verbose;` blocker and line 1624 `PyObject weaklist = finalize_remove_modules(modules, verbose);` in `finalize_modules()`. New exact first blocker is line 1838 (`error C2275: 'PyThreadState' : illegal use of this type as an expression`) at `PyThreadState tstate = _PyRuntimeState_GetThreadState(runtime);` in `Py_FinalizeEx()`, followed by line 1868 `int malloc_stats = tstate->interp->config.malloc_stats;` and later finalization declaration-order blockers.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` finalize_modules_clear_weaklist C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists Py_ssize_t i plus PyObject *tup, name, mod, and dict to the top declaration group in finalize_modules_clear_weaklist(). The reverse loop now assigns i = PyList_GET_SIZE(weaklist) - 1 at the original loop point, and each former loop-local declaration is now an assignment at the same position, preserving evaluation order and the two existing continue paths.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 1551 `for (Py_ssize_t i = PyList_GET_SIZE(weaklist) - 1; i >= 0; i--)` blocker and the same loop's `PyObject tup`, `name`, `mod`, and `dict` mixed declarations. New exact first blocker is line 1606 (`error C2143: syntax error : missing ';' before 'type'`) at `int verbose = _PyInterpreterState_GetConfig(interp)->verbose;` in `finalize_modules()`, followed by line 1624 `PyObject weaklist = finalize_remove_modules(modules, verbose);` and later finalization declaration-order blockers.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` finalize_modules_delete_special C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists const char * const *p and PyObject *value to the top declaration group in finalize_modules_delete_special(). The first loop now assigns p = sys_deletes at the original declaration point, and the second loop assigns value = _PyDict_GetItemStringWithError(...) where the mixed declaration used to be. name and orig_name remain loop-local, preserving their evaluation/order.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 1411 `const char * const p;` blocker and the line 1426 `PyObject value` blocker in `finalize_modules_delete_special()`. New exact first blocker is line 1551 (`error C2143: syntax error : missing ';' before 'type'`) at `for (Py_ssize_t i = PyList_GET_SIZE(weaklist) - 1; i >= 0; i--)` in `finalize_modules_clear_weaklist()`, followed by `PyObject tup`, `PyObject name`, `PyObject mod`, and `PyObject dict` mixed declarations in the same loop/function plus later finalization blockers.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` pyinit_main/public initialization API C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists declaration-order blockers in pyinit_main(), Py_InitializeFromConfig(), Py_InitializeEx(), and _Py_InitializeMain(). Locals are declared at function top, while assignments/calls (tstate->interp, _PyRuntime_Initialize(), &_PyRuntime, tstate = NULL, _PyConfig_InitCompatConfig(), and _PyRuntimeState_GetThreadState(runtime)) remain at their original execution points to preserve behavior.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 1285 `PyStatus status = init_interp_main(tstate);` blocker in `pyinit_main()` and the declaration-order fallout in `Py_InitializeFromConfig()`, `Py_InitializeEx()`, and `_Py_InitializeMain()`. New exact first blocker is line 1411 (`error C2143: syntax error : missing ';' before 'const'`) at `const char * const p;` in `finalize_modules_delete_special()`, followed by `PyObject value` in the same function and later finalization mixed-declaration blockers.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` pyinit_core/init_interp_main C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists PyConfig config to the top of pyinit_core() while leaving PyConfig_InitPythonConfig(&config) at its original execution point. init_interp_main() now declares PyStatus status, then initialized is_main_interp, interp, and config at function top before the existing assert, preserving the declaration initializer order requested for this narrow VC6 declaration-order slice.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 1104 `PyConfig config;` blocker in `pyinit_core()` and the immediately exposed `init_interp_main()` mixed declarations. New exact first blocker is line 1285 (`error C2275: 'PyStatus' : illegal use of this type as an expression`) at the mixed declaration `PyStatus status = init_interp_main(tstate);` in `pyinit_main()`, followed by additional declaration-order fallout in `Py_InitializeFromConfig()` and later functions.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` pre-initialization C89/C99 slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — removes the two pre-initialization _PyArgv designated initializers in Py_PreInitializeFromBytesArgs() and Py_PreInitializeFromArgs() by declaring args first and assigning use_bytes_argv, argc, and the active argv pointer field explicitly before the existing _Py_PreInitializeFromPyArgv() call. _Py_PreInitializeFromConfig() now declares PyStatus status, _PyRuntimeState *runtime, PyPreConfig preconfig, and _PyArgv config_args at function top, assigns status/runtime at their original execution points, and replaces the args == NULL branch's designated config_args initializer with field-by-field assignments immediately before the existing call. Evaluation and call order are unchanged.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 1008 and 1016 `_PyArgv args = { .use_bytes_argv = ... }` designated initializers, plus the mixed declarations and designated `config_args` initializer inside `_Py_PreInitializeFromConfig()`. New exact first blocker is line 1104 (`error C2275: 'PyConfig' : illegal use of this type as an expression`) at the mixed declaration `PyConfig config;` in `pyinit_core()`, followed by nearby `pyinit_main()` declaration-order blockers and later C89/C99 fallout.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` builtins C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists the remaining VC6-rejected PyObject * declarations in pycore_init_builtins() (bimod, builtins_dict, isinstance, len, list_append, and import_func) to the function top, then assigns each at its original execution site. Evaluation order and existing error paths are unchanged; each local is still assigned before use.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past all mixed declarations in `pycore_init_builtins()`. New exact first blocker is line 912 (`error C2143: syntax error : missing ';' before 'const'`) at the mixed declaration `const PyConfig *config = _PyInterpreterState_GetConfig(interp);` in `pycore_interp_init()`, followed by the undeclared `config` fallout and later C89/C99 blockers.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` create-interpreter C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists only the two next VC6-rejected declarations in pycore_create_interpreter(): PyInterpreterState *interp and PyThreadState *tstate are now declared at function top, while _PyGILState_Init(runtime), PyInterpreterState_New(), and PyThreadState_New(interp) still execute at their original call sites and in the same order.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 682 `pycore_create_interpreter()` `PyInterpreterState interp` mixed declaration and line 693 `PyThreadState tstate` mixed declaration. New exact first blocker is line 812 (`error C2275: 'PyObject' : illegal use of this type as an expression`) at the mixed declaration `PyObject builtins_dict = PyEval_GetBuiltins();` in `pycore_init_builtins()`, followed by the same function's line 819 `PyObject isinstance = PyDict_GetItem(...)` and additional C89 mixed-declaration blockers.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`pylifecycle.c` interpreter-config C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists only the interpreter-configuration PyStatus locals that VC6 rejected as mixed declarations: interpreter_update_config() now declares one PyStatus status at function top and assigns it at the two original call sites, and _PyInterpreterState_SetConfig() declares PyConfig config / PyStatus status before calling PyConfig_InitPythonConfig(). Assignment/evaluation order is unchanged and the former inner status shadowing is removed.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 528 `_PyInterpreterState_SetConfig()` mixed-declaration blocker and the nearby line 505 `interpreter_update_config()` `PyStatus` shadow declaration. New exact first blocker is line 580 (`error C2275: 'PyInterpreterState' : illegal use of this type as an expression`) at the mixed declaration `PyInterpreterState *interp = tstate->interp;` in `pyinit_core_reconfigure()`, followed by additional C89 mixed-declaration blockers including line 614 `PyStatus status = _PyConfig_Write(config, runtime);` in `pycore_init_runtime()`.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`_PyStatus_OK()` recursion fix and `_PyStatus_ERR()` VC6 helper slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Include/internal/pycore_initconfig.h — replaces the VC6-only _PyStatus_OK() mapping to PyStatus_Ok() with a local static C89 helper that assigns all PyStatus fields explicitly, avoiding the PyStatus_Ok() -> _PyStatus_OK() -> PyStatus_Ok() recursion. Adds a VC6-only _PyStatus_ERR() helper that assigns _type = _PyStatus_TYPE_ERROR, func = NULL (matching public PyStatus_Error() semantics because VC6 has neither __func__ nor __FUNCTION__), err_msg, and exitcode = 0. Non-VC6 compound-literal macros are unchanged.
scripts/fixtures/vc6_compound_literal_smoke.c — now exercises both _PyStatus_OK() and _PyStatus_ERR() through the real internal header.
scripts/vc6-probe-core.test.sh — adds a focused regression check that _PyStatus_OK() no longer maps to PyStatus_Ok(), and updates the compound-literal smoke-test description.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_compound_literal_smoke.c`	exit 0 — focused smoke fixture compiles while calling both `_PyStatus_OK()` and `_PyStatus_ERR()` directly under VC6.
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 28/28 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 259 `_PyStatus_ERR("external importer setup failed")` compound-literal blocker. New exact first blocker is line 528 (`error C2275: 'PyStatus' : illegal use of this type as an expression`) at the mixed declaration `PyStatus status = _PyConfig_Copy(&config, src_config);` in `_PyInterpreterState_SetConfig()`, followed by additional C89 mixed-declaration blockers.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`init_importlib()` C89 declaration-hoist slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — hoists only the existing init_importlib() local declarations (interp, verbose, importlib, imp_mod, value) to the top of the function, then preserves the prior assignment/evaluation order after the existing assertion and at each original use site.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ worktree exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 27/27 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 202 `init_importlib()` mixed-declaration blocker. New exact first blocker is line 259 (`error C2059: syntax error : '{'`) at `_PyStatus_ERR("external importer setup failed")` in `init_importlib_external()`, followed by further `PyStatus` compound-literal/designated-initializer and C89 mixed-declaration blockers.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`_PyStatus_OK()` VC6 macro fallback slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Include/internal/pycore_initconfig.h — keeps the existing C99 compound-literal _PyStatus_OK() macro for non-VC6 compilers, but maps _PyStatus_OK() to the existing public PyStatus_Ok() API only for _MSC_VER < 1300 so VC6 no longer has to parse (PyStatus){._type = ...} at _PyRuntime_Initialize().
scripts/fixtures/vc6_compound_literal_smoke.c — now exercises _PyStatus_OK() itself, verifying the VC6-only macro fallback rather than bypassing it by calling PyStatus_Ok() directly.
scripts/vc6-probe-core.test.sh — updates the focused compound-literal smoke-test description for the shared macro fallback.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits. Reproducibility check: git apply --check against a pristine temporary cpython/ copy exited 0.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_compound_literal_smoke.c`	exit 0 — focused smoke fixture now compiles while calling `_PyStatus_OK()` directly under VC6.
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 27/27 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior line 143 `_PyStatus_OK()` compound-literal blocker. New exact first blocker is line 202 (`error C2143: syntax error : missing ';' before 'type'`), the existing C89 mixed-declaration wall in `init_importlib()`, followed by further declaration-order and remaining non-OK compound-literal/designated-initializer blockers.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in previous revision (`_PyRuntimeState_INIT` VC6 replacement slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Include/internal/pycore_runtime_init.h — keeps the existing C99 designated initializer path for non-VC6 compilers, but exposes _PyRuntimeState_InitStaticDefaults() for VC6 instead of making VC6 parse _PyRuntimeState_INIT.
cpython/Python/pylifecycle.c — leaves _PyRuntime zero-initialized only for VC6, then calls the shared explicit defaults routine once before _PyRuntimeState_Init(). Non-VC6 still uses = _PyRuntimeState_INIT.
cpython/Python/pystate.c — adds the VC6 field-by-field default routine used by both the process-global runtime and later runtime/interpreter/thread resets. It explicitly preserves the required defaults: gilstate.check_enabled = 1, zeroed Py_tss_NEEDS_INIT storage, interpreters.next_id = -1, global small ints/bytes/strings/empty tuple, _main_interpreter (_static, id_refcount, recursion/gc thresholds), and _initial_thread (_static, recursion limit, context_ver = 1). Non-VC6 still uses the upstream static const initial = _PyRuntimeState_INIT/memcpy path.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated from git -C cpython diff; includes this slice plus earlier uncommitted compatibility edits.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 27/27 checks `ok`; `Modules/main.c` still compiles cleanly
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — the `_PyRuntime` definition no longer fails at `_PyRuntimeState_INIT` line 112. New first error is line 143 (`_PyStatus_OK()` compound literal), followed by existing C89 declaration-order and C99 initializer blockers in the rest of the file.
`bash scripts/vc6-probe-core.sh cpython/Python/pystate.c`	exit 2 — the former `static const _PyRuntimeState initial = _PyRuntimeState_INIT` C2059 errors are gone and later `initial._main_interpreter` reset users are covered by the same VC6 defaults helpers. Current first errors are pre-existing C89 declaration-order issues in `pycore_frame.h` and then in `pystate.c`; no remaining `_PyRuntimeState_INIT` parse error is reported before the 100-error cap.

Caveat: this is still compile-probe work only. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Files changed in this revision (`pylifecycle.c` VC6 PyRuntime section slice)

All still uncommitted; nothing in this list has been pushed anywhere.

cpython/Python/pylifecycle.c — narrow VC6-only compatibility edit for the first Python/pylifecycle.c blocker: keep the modern Windows #pragma section("PyRuntime", read, write) + __declspec(allocate("PyRuntime")) path unchanged for non-VC6 compilers, but use VC6's supported #pragma data_seg("PyRuntime") / #pragma data_seg() spelling around the initialized _PyRuntime object when _MSC_VER < 1300. The _PyRuntimeState_INIT initializer remains exactly at the definition site.
compat/msvc600/cpython-3.11.16-vc6-headers.patch — regenerated in full from git -C cpython diff; now 767 lines and includes the Python/pylifecycle.c hunk alongside previous uncommitted compatibility edits.
PORT_STATUS.md — this revision.

Command results (all reproduced in this revision):

Command	Result
`bash scripts/vc6-probe.test.sh`	exit 0, `ALL TESTS PASSED` — 6/6 checks `ok`
`bash scripts/vc6-probe-core.test.sh`	exit 0, `ALL TESTS PASSED` — 27/27 checks `ok`; includes `Modules/main.c` compile-only clean check
`bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c`	exit 2 — gets past the prior VC6-incompatible `PyRuntime` section pragma/declaration pair; no `unknown pragma` warning and no `C2341` segment error remain. New first blocker is `cpython\Python\pylifecycle.c(112) : error C2059: syntax error : '.'` in `_PyRuntimeState_INIT`, followed by more C99 compound-literal/designated-initializer and C89 mixed-declaration errors; the run later hits `fatal error C1003` at line 1232.

Caveat: all probe results here are compile-only (/c) results. No link, no pythoncore/python.exe build, no Wine launch, and no Windows 98 runtime execution was attempted or claimed.

Verified

CPython source checkout is at the requested v3.11.16 baseline.
The MSVC600 tool bundle is present locally and its VC98/bin/VCVARS32.BAT environment script runs under Wine.

MSVC6 reports:

Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86

A direct compile probe reaches CPython 3.11 headers. The first unmodified probe fails before linking, proving the compiler is being invoked against the intended baseline.
Project-local compatibility headers have been added under compat/msvc600/: inttypes.h (first isolated shim) and, as of this revision, stdbool.h (see "stdbool slice" below). Neither is declared sufficient for the port on its own.
scripts/vc6-probe.sh was fixed and is now truthful. The script piped cl.exe output through grep/sed to drop Wine's :err: debug noise and to shorten absolute host paths to repo-relative ones. The path-shortening step was silently broken: it built a sed pattern directly from a Windows-style path (e.g. Z:\home\ubuntu\...\), and both sed BRE and bash glob patterns treat a bare \ in a pattern as an escape character, so \h, \u, \p, etc. were consumed as (mostly no-op) escapes instead of literal characters and the substitution never matched anything — diagnostics always showed full absolute Wine paths instead of the intended repo-relative ones. Fixed by matching the prefix as a literal string via a quoted bash ${line//"$prefix"/} expansion (quoting forces literal, not glob, matching) instead of an unescaped regex. The pipeline's exit-status capture via PIPESTATUS[0] was already correct (verified with a deliberately broken translation unit: cl.exe's real nonzero exit code propagated correctly both before and after this fix); it is now covered by a regression test so it cannot regress silently. A new regression test, scripts/vc6-probe.test.sh, exercises both the path-stripping helper directly and — when wine + MSVC600 are available, as they are in this environment — the real script against a deliberately invalid .c file, asserting a nonzero exit code, a surfaced error C diagnostic, and no leaked absolute Wine path. Run: bash scripts/vc6-probe.test.sh. Last run: all 6 checks ok.
**Include/internal/pycore_atomic.h's VC6/intrin.h blocker is now resolved for 32-bit x86 (_M_IX86) and verified; see "Atomics slice" below for full detail and honesty notes on what is and is not covered.
**Include/internal/pycore_interp.h's VC6/<stdbool.h> blocker is now resolved and verified; see "stdbool slice" below for full detail.
**The VC6 C89-vs-C99 mixed-declarations blocker in four Include/internal/pycore_*.h headers (pycore_code.h, pycore_dict.h, pycore_list.h, pycore_call.h) reachable from Modules/main.c is now resolved and verified; see "Mixed-declarations header slice" below for full detail.
The same C89-vs-C99 mixed-declarations pattern, pervasive within Modules/main.c's own body (29 error sites across roughly a dozen functions), is now also resolved and verified; see "Modules/main.c declaration-order slice" below for full detail. With that fix applied, Modules/main.c hits a new, unrelated, and out-of-scope-for-that-slice blocker: several C99 compound-literal/designated-initializer macros (_PyStatus_OK(), _PyCompilerFlags_INIT, and the _PyArgv-style struct literals in Py_Main()/Py_BytesMain()) that VC6 does not support at all, independent of declaration position.
That compound-literal/designated-initializer blocker is now also resolved and verified for all 8 sites in Modules/main.c; see "Compound-literal / designated-initializer slice" below for full detail. With that fix applied, cpython/Modules/main.c compiles with cl.exe exit status 0 under scripts/vc6-probe-core.sh — no errors, no warnings. This is a compile-only (/c) result for one translation unit; it is not a link, not a pythoncore/python.exe build, and not a runtime claim (vc6-probe-core.sh never attempts to link). Probing the next core translation unit in Modules/main.c's own call chain, Python/pylifecycle.c, hits the same two already-solved blocker classes again (recurring, not novel) plus enough additional errors to exceed the compiler's 100-error cap before the whole file is even seen; see "Next blocker: Python/pylifecycle.c" below. No link or runtime success is claimed anywhere in this document.

`pycore_object.h` VC6 `func` / GC helper declaration-order slice

Scope: one internal header only, as requested. The real Python/pylifecycle.c core probe previously stopped first in Include/internal/pycore_object.h: VC6 reported __func__ undeclared at the _PyObject_ASSERT_FROM(..., __func__) calls in _PyObject_GC_TRACK(), then cascaded into C89 mixed-declaration errors for the local PyGC_Head * and PyInterpreterState * declarations in _PyObject_GC_TRACK() and _PyObject_GC_UNTRACK().

The header now has a VC6-only fallback:

#if defined(_MSC_VER) && _MSC_VER < 1300 && !defined(__func__)
#  define __func__ "<unknown>"
#endif

A quick VC6 smoke probe showed __FUNCTION__ is also unavailable in VC6, so there was no exact function-name extension to preserve. This mapping only degrades debug/fatal diagnostic function-name text on VC6; C99 compilers and newer MSVC keep their normal behavior. The only declaration-order edits are the mechanical C89 transform in _PyObject_GC_TRACK() and _PyObject_GC_UNTRACK(): declarations at block start, assignments left at the original evaluation points.

Verification: bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c now gets past pycore_object.h; the new first blocker is the Windows section-allocation pragma pair in Python/pylifecycle.c (see "Next blocker" below).

Atomics slice (`pycore_atomic.h`, VC6 / `_M_IX86`)

Scope: 32-bit x86 only, matching this port's only target (Windows 9x has no x64 edition). Include/internal/pycore_atomic.h previously included <intrin.h> and used _Interlocked* compiler intrinsics unconditionally for any _MSC_VER-defined compiler; VC6 (_MSC_VER 1200) has neither. The now-applied, still-uncommitted compat/msvc600/cpython-3.11.16-vc6-headers.patch adds two things to this header, both gated strictly to defined(_MSC_VER) && _MSC_VER < 1300 && defined(_M_IX86) (a new _Py_ATOMIC_VC6_X86 macro) so every other compiler/version — including modern MSVC on _M_X64/ARM and the GCC/clang/C11 paths — keeps its exact prior behavior, byte-for-byte (verified: git diff on the non-VC6 branches shows only their line numbers moving under the new #elif, no content changes):

The top-of-file <intrin.h>/<immintrin.h> include is skipped for VC6/_M_IX86; <windows.h> is included instead, to declare InterlockedExchange/InterlockedCompareExchange.
A new #if defined(_Py_ATOMIC_VC6_X86) branch (ahead of the existing _M_IX86 || _M_X64 branch, now #elif) implements _Py_atomic_store_explicit/_Py_atomic_load_explicit for _Py_atomic_int/_Py_atomic_address using the Win32 InterlockedExchange/InterlockedCompareExchange API — present in KERNEL32.DLL since Windows 98 (confirmed against this project's actual MSVC600 VC98 SDK headers, MSVC600/VC98/Include/WINBASE.H, which declare both for _M_IX86 outside the MRx000/Alpha-only intrinsic path). Both give a full memory barrier on x86, same as the intrinsics they replace, so — as the original comment already notes for the HLE-unavailable case — every _Py_memory_order maps to the same fully-fenced operation; VC6 has no HLE (_HLEAcquire/_HLERelease, VS2013+) intrinsics or hardware support to preserve here regardless.

64-bit atomics are explicitly NOT implemented, and this is not a gap in practice for this port. _Py_atomic_address (uintptr_t) and _Py_atomic_int (int) are both 4 bytes on 32-bit x86, so the existing sizeof(...) == 8 branches that select the 64-bit store/load paths in the pre-existing _M_IX86 || _M_X64 code are already unreachable dead code on _M_IX86 upstream, before this patch — VC6 never defines _M_X64. The VC6 branch added here therefore has no 64-bit path to implement, and a #error guards the (unreachable-under-VC6) case where _M_X64 were ever also defined, so a future misconfiguration fails loudly at compile time instead of silently truncating a 64-bit atomic. No CMPXCHG8B inline assembly was written, and none is required for this header; if some other part of the port needs genuine 64-bit interlocked ops on VC6 later, that is a separate, not-yet-encountered problem, not something papered over here.

Verified with two independent probes, both under scripts/vc6-probe-core.sh (new; extends scripts/vc6-probe.sh's approach to Py_BUILD_CORE translation units — /D Py_BUILD_CORE plus Include/internal on the include path):

scripts/fixtures/vc6_atomic_smoke.c (new) — a minimal, isolated translation unit that includes only pycore_atomic.h (via <inttypes.h> for uintptr_t, which real callers get from Python.h/pyport.h) and exercises _Py_atomic_store/_Py_atomic_load and their _relaxed variants on both _Py_atomic_int and _Py_atomic_address:
```
$ bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_atomic_smoke.c
== MSVC600 Py_BUILD_CORE compile probe ==
source : scripts/fixtures/vc6_atomic_smoke.c
...
vc6_atomic_smoke.c

== cl.exe exit status: 0 ==
```
No errors, no warnings.
cpython/Modules/main.c, the same real core translation unit identified as the next blocker previously. It now compiles past pycore_atomic.h (reached transitively via pycore_runtime.h before pycore_interp.h) and hits a new, different, and unrelated blocker:
```
$ bash scripts/vc6-probe-core.sh
== MSVC600 Py_BUILD_CORE compile probe ==
source : cpython/Modules/main.c
...
cpython\Include\internal\pycore_interp.h(11) : fatal error C1083:
Cannot open include file: 'stdbool.h': No such file or directory

== cl.exe exit status: 2 ==
```
Include/internal/pycore_interp.h line 11 does #include <stdbool.h> before its own #include "pycore_atomic.h" on line 13 — a C99 standard header VC6 does not ship, unrelated to atomics. This is the next blocker for this port and is left unaddressed here, out of scope for this slice.

Both probes are covered by a new regression test, scripts/vc6-probe-core.test.sh, which additionally asserts (so this result cannot regress silently) that a deliberately broken translation unit still fails with a surfaced error C diagnostic, and that Modules/main.c's current failure is specifically not at pycore_atomic.h/intrin.h (i.e. that blocker has not resurfaced). Run: bash scripts/vc6-probe-core.test.sh. At the time this atomics slice was written, this was all 6 checks ok; the stdbool slice below added 5 more checks to the same file (now 11; see that section for the current count and last-run result). scripts/vc6-probe.test.sh was re-run after the atomics change and still passed (all 6 checks ok), confirming the public-header probe was unaffected.

stdbool slice (`pycore_interp.h`, VC6 / C99 `<stdbool.h>`)

Include/internal/pycore_interp.h line 11 does #include <stdbool.h> before its own #include "pycore_atomic.h" on line 13 — a C99 standard header VC6 (_MSC_VER 1200, which predates C99 entirely) does not ship. In VC6's C mode, bool/true/false are not keywords at all (they are C++-only there), and there is no standard-library <stdbool.h> to fall back on.

The now-added, still-uncommitted compat/msvc600/stdbool.h is a project-local fallback for this single header, not a patch to CPython source. It is picked up purely through include-path ordering: both scripts/vc6-probe.sh and scripts/vc6-probe-core.sh already put compat/msvc600 first on the VC6 /I include path (needed earlier for compat/msvc600/inttypes.h), so VC6's #include <stdbool.h> resolves to this project-local header before it would ever reach a (nonexistent) system one. Nothing under cpython/ changes for this slice, so compat/msvc600/cpython-3.11.16-vc6-headers.patch is unchanged. Every other compiler is unaffected for the same reason a browser's /I search order doesn't affect other browsers: compat/msvc600 is never added to any other compiler's include path, so a conforming C99/C11 compiler still gets its own real <stdbool.h> (or built-in _Bool/bool), untouched. As defence in depth (not because it is expected to be reachable), the header itself also #errors out if included under anything but _MSC_VER < 1300.

The shim defines the same four names as the standard C99 header — bool (as int, since VC6 has no _Bool built-in type to alias), true, false, and __bool_true_false_are_defined — as plain #define macros rather than a typedef, matching the standard's requirement that a conforming program be able to #undef/redefine bool/true/false.

Verified with the same two-probe approach used for the atomics slice:

scripts/fixtures/vc6_stdbool_smoke.c (new) — a minimal, isolated translation unit that includes only <stdbool.h> and exercises bool/true/false/__bool_true_false_are_defined:

$ bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_stdbool_smoke.c
== MSVC600 Py_BUILD_CORE compile probe ==
source : scripts/fixtures/vc6_stdbool_smoke.c
...
vc6_stdbool_smoke.c

== cl.exe exit status: 0 ==

No errors, no warnings.

cpython/Modules/main.c, the same real core translation unit used to verify the atomics slice. It now compiles past pycore_interp.h line 11 (reached the same way as before, transitively via pycore_runtime.h) — the fatal stdbool.h/C1083 error is gone — and proceeds through pycore_atomic.h and pycore_ast_state.h before hitting a new, unrelated, and considerably larger blocker; see "Current first-blocker evidence" below for the full detail.

Both probes are covered by 5 new checks added to the existing scripts/vc6-probe-core.test.sh (positive isolated-fixture compile, no-errors check, a negative deliberately-broken-fixture check, its error-surfaced check, and a check that Modules/main.c's output no longer contains Cannot open include file: 'stdbool.h'), bringing that file to 11 checks total. Run: bash scripts/vc6-probe-core.test.sh. Last run: all 11 checks ok (wine + MSVC600 available in this environment). scripts/vc6-probe.test.sh was re-run after this change and still passes (all 6 checks ok), confirming the public-header probe is unaffected.

Mixed-declarations header slice (`pycore_code.h`, `pycore_dict.h`, `pycore_list.h`, `pycore_call.h`)

Scope: the four Include/internal/pycore_*.h headers that the Modules/main.c #include chain directly reaches with VC6 C89 mixed-declaration violations, and no others. This is a bounded slice of the "Compiler language gap" blocker recorded below, not an attempt at the whole gap: it fixes exactly the sites the real core probe (Modules/main.c via scripts/vc6-probe-core.sh) hits inside CPython's own headers, and stops there. Modules/main.c itself has the same pattern pervasively throughout its own function bodies; that is explicitly out of scope for this slice and is now the next recorded blocker (see "Current first-blocker evidence" below) rather than something papered over here.

Six static inline functions across the four headers declared a variable after a preceding statement (typically an assert(...)), which C89 (VC6's only supported dialect, give or take Microsoft extensions) does not allow inside a block — only C99 does. VC6's parser, on hitting the declaration where it expects a statement, fails to recognize it as a declaration at all and instead cascades into unrelated-looking C2065/C2109/C2106 errors for the rest of the block, exactly as described for the first instance (pycore_code.h:154) in earlier revisions of this document.

The now-applied, still-uncommitted compat/msvc600/cpython-3.11.16-vc6-headers.patch fixes each site the same way: hoist the declaration (no initializer) to the top of its enclosing block, and turn the original TYPE name = expr; into a plain assignment (name = expr;) at its original position. This changes no evaluation order and no semantics — it is the standard, mechanical C89 transform for this exact pattern — and is applied only to the six functions that actually needed it, not the surrounding file:

Include/internal/pycore_code.h: _PyLocals_GetKind(), _PyLocals_SetKind() (both hoist a char *ptr), and adaptive_counter_backoff() (hoists unsigned int value).
Include/internal/pycore_dict.h: _PyDictValues_AddToInsertionOrder() (hoists uint8_t *size_ptr and int size).
Include/internal/pycore_list.h: _PyList_AppendTakeRef() (hoists Py_ssize_t len and Py_ssize_t allocated).
Include/internal/pycore_call.h: _PyVectorcall_FunctionInline() (hoists PyTypeObject *tp, Py_ssize_t offset, and vectorcallfunc ptr).

Every other compiler is unaffected: these are plain C source edits (no #ifdef/_MSC_VER gating, unlike the atomics slice), and hoisting a declaration without an initializer, then assigning immediately after the same statements that used to compute the initializer, is behavior-identical under C89, C99, C11, and C++ alike — no code path, value, or evaluation order changes for any compiler already accepting the original source.

Verified with the same two-probe approach used for the atomics and stdbool slices:

scripts/fixtures/vc6_mixed_decls_smoke.c (new) — includes the real Python.h (these four headers assume public types like PyObject, PyCodeObject, PyListObject, PyDictValues, and vectorcallfunc already declared, the same way real CPython .c sources reach them, so full isolation without Python.h is not meaningful here unlike the atomics/stdbool fixtures) plus all four headers, and calls all six fixed functions:
```
$ bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_mixed_decls_smoke.c
== MSVC600 Py_BUILD_CORE compile probe ==
source : scripts/fixtures/vc6_mixed_decls_smoke.c
...
vc6_mixed_decls_smoke.c
...
== cl.exe exit status: 0 ==
```
No errors, no warnings.
cpython/Modules/main.c, the same real core translation unit used for the earlier slices. All four headers now compile clean — no pycore_code.h/pycore_dict.h/pycore_list.h/pycore_call.h error appears anywhere in the probe output — and the compiler proceeds entirely into Modules/main.c's own body, where a new, considerably larger, and out-of-scope-for-this-slice blocker is hit; see "Current first-blocker evidence" below.

Modules/main.c declaration-order slice

Scope: the C89-vs-C99 mixed-declarations pattern inside Modules/main.c's own function bodies only — declaration position, not any other C99 feature. No other file was touched, and no whole-tree mechanical rewrite was attempted. This is the follow-on to the "Mixed-declarations header slice" above: the same pattern (a block-scope declaration appearing after a preceding statement, which C89's parser cannot recognize as a declaration), but recurring roughly a dozen times across Modules/main.c's own ~740 lines rather than in a handful of small header functions.

The now-applied, still-uncommitted compat/msvc600/cpython-3.11.16-vc6-headers.patch fixes every site the same mechanical way used for the header slice: hoist the bare declaration (no initializer) to the top of its enclosing block, and turn the original TYPE name = expr; into a plain assignment (name = expr;) at its original position. This changes no evaluation order and no semantics for any compiler, VC6 or otherwise. Two variants of this same transform were needed, both already implicit in the mechanical rule but worth calling out explicitly:

A declaration whose original initializer is a side-effecting call (e.g. FILE *fp = _Py_fopen_obj(filename, "rb"); in pymain_run_file_obj()) is hoisted bare and the call is kept as an assignment at its original position, specifically so the call still happens after the same preceding statements (an audit-hook check, in this case) instead of moving earlier and changing behavior.
A platform-conditional declaration with the same name but a different type per branch (pymain_run_startup()'s env: const wchar_t *env under #ifdef MS_WINDOWS, const char *env under #else) is hoisted under the identical #ifdef/#else/#endif structure at the top of the function, so each platform still only ever sees its own declaration.

Functions touched (8 total, 20 hoisted declarations, all in cpython/Modules/main.c): pymain_init() (preconfig, config), pymain_import_readline() (mod), pymain_run_command() (cf), pymain_run_file_obj() (fp, sb, cf, run), pymain_run_file() (filename, program_name, res), pymain_run_startup() (startup, env, fp, cf), pymain_run_stdin() (a nested-block exitcode, plus outer-scope cf, run), and pymain_repl() (cf, res). pymain_get_importer(), pymain_sys_path_add_path0(), pymain_run_module(), pymain_run_interactive_hook(), pymain_run_python(), Py_RunMain(), and pymain_main() were inspected and found to already declare every local before the first statement in their block (including two back-to-back declarations in pymain_run_python()'s else if (!config->safe_path) block, which is valid C89 since no statement separates them) — left untouched, consistent with "only the sites that actually need it."

A note on scope, since it matters for what this slice does and does not claim: several of the hoisted declarations are of type PyCompilerFlags or are assigned via _PyStatus_OK(), both of which are initialized through C99 compound-literal macros (_PyCompilerFlags_INIT, _PyStatus_OK()). Hoisting the declaration is still the correct, necessary C89 fix for the mixed-declaration violation at each of those sites — it eliminates that specific error class everywhere it appeared in main.c, as confirmed below — but the compound-literal initializer itself is a separate C99 feature VC6 does not support at any declaration position. That is a new, distinct blocker, not a residue of this slice's fix; see "Current first-blocker evidence" below, where it is documented rather than papered over.

Verified with the same two-probe approach used for the earlier slices:

scripts/fixtures/vc6_decl_order_smoke.c (new) — a minimal, self-contained fixture (no CPython headers) that exercises, in isolation, the shape of every hoist pattern used in main.c: a bare hoist above an early return, a side-effecting-initializer hoist, a hoisted pair where fixing the first declaration would otherwise turn an immediately-following second declaration into a new violation, a nested-block hoist, and the platform-conditional same-name/different-type hoist. Kept separate from main.c itself so it keeps guarding the general transformation shape even as main.c changes upstream:
```
$ bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_decl_order_smoke.c
== MSVC600 Py_BUILD_CORE compile probe ==
source : scripts/fixtures/vc6_decl_order_smoke.c
...
vc6_decl_order_smoke.c

== cl.exe exit status: 0 ==
```
No errors, no warnings.
cpython/Modules/main.c itself, the same real core translation unit used throughout this document. Every C2146/C2065/C2275 declaration-position error is gone; the previous 29-error-line run is now down to 8 error lines, all a different error code (C2059) at a different root cause (compound literals / designated initializers, not declaration position — see "Current first-blocker evidence" below for the full transcript).

Both probes are covered by 5 new checks added to scripts/vc6-probe-core.test.sh (positive isolated-fixture compile, no-errors check, a negative deliberately-broken-fixture check, its error-surfaced check, and a check that Modules/main.c's output no longer contains any declaration-position error — C2146, an "undeclared identifier" C2065, or a type-as-expression C2275 — anywhere in its own body), bringing that file to 21 checks total. Run: bash scripts/vc6-probe-core.test.sh. Last run: all 21 checks ok (wine + MSVC600 available in this environment). scripts/vc6-probe.test.sh was re-run after this change and still passes (all 6 checks ok), confirming the public-header probe is unaffected. The patch's reproducibility was re-verified against a genuinely pristine tree (a fresh cp -a cpython /tmp/cpython_pristine_check && git -C /tmp/cpython_pristine_check checkout -- ., not a stash of the working checkout): git apply --check from inside that pristine copy exits 0, and after applying, diff -rq between the patched pristine copy and this project's actual cpython/ working tree (excluding .git) reports no differences. The temporary copy was removed afterward; nothing under cpython/ or compat/ was affected by this verification step.

Compound-literal / designated-initializer slice

Scope: the 8 C99 compound-literal/designated-initializer call sites inside Modules/main.c's own body only — no header-level macro change, and no other file touched. This is the follow-on to the "Modules/main.c declaration-order slice" above, addressing exactly the blocker that slice left recorded as out of scope: VC6 (a pre-C99 compiler) supports neither C99 compound literals ((PyStatus){...}) nor C99 designated initializers ({ .field = value, ... }), at any position in a block, regardless of where the destination variable is declared.

Three distinct patterns were responsible, each fixed a different way, all still uncommitted in compat/msvc600/cpython-3.11.16-vc6-headers.patch:

status = _PyStatus_OK(); (1 site, pymain_init()). Rather than reimplementing the macro's field assignment by hand, this is replaced with status = PyStatus_Ok(); — the existing public API function declared in Include/cpython/initconfig.h (PyAPI_FUNC(PyStatus) PyStatus_Ok(void);) and defined in Python/initconfig.c as PyStatus PyStatus_Ok(void) { return _PyStatus_OK(); } — i.e. it returns the exact value the macro would have produced, by construction, not by re-derivation. This needed no header change: the function was already declared and part of the public ABI; main.c just wasn't calling it. Behavior is identical for every compiler, VC6 or otherwise — main.c now calls a function that itself still uses the compound-literal macro internally in Python/initconfig.c, which is fine because Python/initconfig.c is not part of this slice's compile-only probe (no link is attempted or claimed) and is explicitly the next kind of file this port will need to work through, not something silently skipped.
cf = _PyCompilerFlags_INIT; (5 sites: pymain_run_command(), pymain_run_file_obj(), pymain_run_startup(), pymain_run_stdin(), pymain_repl()). No public-API equivalent exists for this one (unlike PyStatus_Ok()), so each site is replaced with the field-by-field assignment the macro itself expands to: cf.cf_flags = 0; cf.cf_feature_version = PY_MINOR_VERSION;. PyCompilerFlags is a two-field plain struct (Include/cpython/compile.h), and cf was already declared (bare, no initializer) at the top of its enclosing block by the prior declaration-order slice, so this is a pure compound-literal-to-assignment substitution with no interaction with declaration position.
_PyArgv args = { .argc = argc, ... }; (2 sites: Py_Main(), Py_BytesMain()). No macro is involved here, just a plain C99 designated-initializer aggregate initializer on a local variable declaration. Replaced with a bare declaration followed by one assignment per field (args.argc = argc; args.use_bytes_argv = 0; ...); field order in the replacement does not matter, unlike the initializer list it replaces, since each is now an independent assignment statement.

Every other compiler is unaffected: PyStatus_Ok() is a normal function call (no macro expansion difference for any compiler), and hoisting a designated-initializer aggregate into field-by-field assignment, or a compound-literal assignment into field-by-field assignment, changes no value, no evaluation order, and no code path for any compiler that already accepted the C99 form — it is strictly a syntax substitution for an identical runtime effect.

Verified with the same two-probe approach used for the earlier slices:

scripts/fixtures/vc6_compound_literal_smoke.c (new) — includes the real Python.h/pycore_initconfig.h (like vc6_mixed_decls_smoke.c, since PyStatus, PyCompilerFlags, and _PyArgv are real CPython types, not reproducible in isolation the way the atomics/stdbool fixtures are) and exercises all three replacement patterns:
```
$ bash scripts/vc6-probe-core.sh scripts/fixtures/vc6_compound_literal_smoke.c
== MSVC600 Py_BUILD_CORE compile probe ==
source : scripts/fixtures/vc6_compound_literal_smoke.c
...
vc6_compound_literal_smoke.c

== cl.exe exit status: 0 ==
```
No errors, no warnings.
cpython/Modules/main.c itself, the same real core translation unit used throughout this document. Every C2059 compound-literal/ designated-initializer error is gone — the previous 8-error-line run is now 0 error lines, and the probe reports cl.exe exit status: 0:
```
$ bash scripts/vc6-probe-core.sh
== MSVC600 Py_BUILD_CORE compile probe ==
source : cpython/Modules/main.c
prefix : /home/ubuntu/.wine-win9xport

Setting environment for using Microsoft Visual C++ tools.
main.c
...
== cl.exe exit status: 0 ==
```
(The only other output is MSVC600's standard informational NOTE: about WINVER 0x0500 being a beta-era SDK combination, present on every probe run in this environment, not new to this slice and not an error or warning.) This is a compile-only (/c) result for one translation unit — scripts/vc6-probe-core.sh never invokes the linker (see its own header comment) — not a claim that Modules/main.c links, that pythoncore/python.exe builds, or that anything runs on Windows 9x.

Both probes are covered by 6 new checks added to scripts/vc6-probe-core.test.sh (positive isolated-fixture compile, no-errors check, a negative deliberately-broken-fixture check, its error-surfaced check, a check that Modules/main.c's output no longer contains any C2059 compound-literal/designated-initializer error anywhere in its own body, and a new end-to-end check that the Modules/main.c probe itself now exits 0), bringing that file to 27 checks total. Run: bash scripts/vc6-probe-core.test.sh. Last run: all 27 checks ok (wine + MSVC600 available in this environment). scripts/vc6-probe.test.sh was re-run after this change and still passes (all 6 checks ok), confirming the public-header probe is unaffected. The patch's reproducibility was re-verified against a genuinely pristine tree (a fresh cp -a cpython /tmp/cpython_pristine_check && git -C /tmp/cpython_pristine_check checkout -- ., not a stash of the working checkout): git apply --check from inside that pristine copy exits 0, and after applying, diff -rq between the patched pristine copy and this project's actual cpython/ working tree (excluding .git) reports no differences. The temporary copy was removed afterward; nothing under cpython/ or compat/ was affected by this verification step.

Next blocker: `Python/pylifecycle.c`

After the PyRuntime section slice, the same real core probe was re-run:

$ bash scripts/vc6-probe-core.sh cpython/Python/pylifecycle.c
== MSVC600 Py_BUILD_CORE compile probe ==
source : cpython/Python/pylifecycle.c
...
cpython\Python\pylifecycle.c(112) : error C2059: syntax error : '.'
cpython\Python\pylifecycle.c(112) : error C2059: syntax error : ','
cpython\Python\pylifecycle.c(130) : error C2059: syntax error : '{'
cpython\Python\pylifecycle.c(189) : error C2143: syntax error : missing ';' before 'type'
cpython\Python\pylifecycle.c(190) : error C2143: syntax error : missing ';' before 'type'
...
cpython\Python\pylifecycle.c(1232) : fatal error C1003: error count exceeds 100; stopping compilation

== cl.exe exit status: 2 ==

The prior first blocker at Python/pylifecycle.c:91-92 is gone: VC6 no longer reports warning C4068: unknown pragma for #pragma section, and no longer rejects __declspec(allocate("PyRuntime")) with C2341. The new exact first blocker is now the _PyRuntimeState_INIT designated-initializer macro used by _PyRuntime itself (C2059: syntax error : '.' at the definition line, now line 112 after the VC6 guard was added). After that, the file still reaches the previously known broader C99 compound-literal/designated-initializer and C89 mixed-declaration wall, eventually hitting the compiler's 100-error cap. This slice did not attempt those broader pylifecycle.c rewrites.

Current first-blocker evidence

The previously recorded long long / C99 integer-suffix blocker is now resolved and verified. The uncommitted compat/msvc600/cpython-3.11.16-vc6-headers.patch (already applied to the cpython/ working tree) replaces bare long long with the existing PY_LONG_LONG macro in Include/longobject.h, Include/pythread.h, and Include/pyexpat.h, and introduces a PY_LL/PY_ULL literal-suffix macro pair (spelled i64/ui64 for _MSC_VER < 1300, i.e. VC6) in PC/pyconfig.h and Include/pyport.h, used in place of raw 123LL/123ULL literals in Include/pythread.h. With this patch applied, the full public header stack compiles cleanly:

$ bash scripts/vc6-probe.sh
== MSVC600 compile probe ==
source : cpython/Programs/python.c
prefix : /home/ubuntu/.wine-win9xport

Setting environment for using Microsoft Visual C++ tools.
python.c

== cl.exe exit status: 0 ==

cpython/Programs/python.c (#include "Python.h" plus a wmain/main stub) now compiles to build/vc6-probe/python.obj (verified present, 7115 bytes) with exit status 0. This exercises the entire public Include/*.h surface reachable from Python.h, not just pyport.h.

The pycore_atomic.h/intrin.h blocker, the pycore_interp.h/ <stdbool.h> blocker, and the mixed-declarations blocker in pycore_code.h/pycore_dict.h/pycore_list.h/pycore_call.h described in earlier revisions of this document are all now resolved; see "Atomics slice", "stdbool slice", and "Mixed-declarations header slice" above for full detail. Probing the same real core translation unit (cpython/Modules/main.c, which needs Include/internal on the include path and Py_BUILD_CORE defined — both required unconditionally by every pycore_*.h header) now gets past all of CPython's internal headers reachable from its #include chain with no header-level error at all, and the compiler proceeds into Modules/main.c's own body — where it hits a new wall, spread across nearly the entire 743-line file:

$ bash scripts/vc6-probe-core.sh
== MSVC600 Py_BUILD_CORE compile probe ==
source : cpython/Modules/main.c
...
cpython\Modules\main.c(44) : error C2275: 'PyPreConfig' : illegal use of this type as an expression
cpython\Modules\main.c(44) : error C2146: syntax error : missing ';' before identifier 'preconfig'
cpython\Modules\main.c(44) : error C2065: 'preconfig' : undeclared identifier
...
cpython\Modules\main.c(52) : error C2275: 'PyConfig' : illegal use of this type as an expression
...
cpython\Modules\main.c(215) : error C2275: 'PyObject' : illegal use of this type as an expression
...
cpython\Modules\main.c(253) : error C2275: 'PyCompilerFlags' : illegal use of this type as an expression
...
== cl.exe exit status: 2 ==

(29 distinct error source lines total in that run, spanning lines 44 through 734 of main.c — effectively the whole file — across roughly a dozen separate functions/blocks.)

This mixed-declarations pattern inside Modules/main.c's own body is now resolved and verified; see "Modules/main.c declaration-order slice" above for full detail. With that fix applied, the same probe now gets past every declaration-position error and hits a new, different, and out-of-scope-for-that-slice blocker:

$ bash scripts/vc6-probe-core.sh
== MSVC600 Py_BUILD_CORE compile probe ==
source : cpython/Modules/main.c
...
cpython\Modules\main.c(71) : error C2059: syntax error : '{'
cpython\Modules\main.c(256) : error C2059: syntax error : '{'
cpython\Modules\main.c(366) : error C2059: syntax error : '{'
cpython\Modules\main.c(448) : error C2059: syntax error : '{'
cpython\Modules\main.c(531) : error C2059: syntax error : '{'
cpython\Modules\main.c(564) : error C2059: syntax error : '{'
cpython\Modules\main.c(748) : error C2059: syntax error : '.'
cpython\Modules\main.c(760) : error C2059: syntax error : '.'

== cl.exe exit status: 2 ==

Down from 29 error lines to 8. Every one of these is the same new root cause, unrelated to declaration position: a C99 compound literal, optionally with designated initializers, neither of which VC6 (a pre-C99 compiler) supports at all, at any position in a block. Two distinct macros/patterns are responsible:

main.c:71, 256, 366, 448, 531, 564 — six sites assigning PyCompilerFlags cf = _PyCompilerFlags_INIT; (now cf = _PyCompilerFlags_INIT; after the declaration-order fix) or status = _PyStatus_OK();. _PyCompilerFlags_INIT and _PyStatus_OK() are defined in Include/cpython/compile.h and Include/internal/pycore_initconfig.h respectively as C99 compound literals with designated initializers, e.g.:
```
#define _PyStatus_OK() \
    (PyStatus){._type = _PyStatus_TYPE_OK,}
#define _PyCompilerFlags_INIT \
    (PyCompilerFlags){.cf_flags = 0, .cf_feature_version = PY_MINOR_VERSION}
```
(PyStatus){...} is a compound literal (C99 §6.5.2.5); ._type = ... inside it is a designated initializer (C99 §6.7.8). VC6 recognizes neither construct and reports the same C2059: syntax error : '{' for every one, regardless of whether the assignment is the first statement in its block or not — hoisting the declaration (already done) cannot fix this, because the problem is the initializer expression's syntax, not where the variable is declared.
main.c:748, 760 — the two _PyArgv args = { .argc = argc, ... }; aggregate initializations in Py_Main()/Py_BytesMain(), which use plain C99 designated-initializer syntax (no compound-literal macro involved, just { .field = value, ... } directly in a local variable's initializer) for the same reason: VC6 predates C99 designated initializers entirely.

This is a distinct C99 language-feature gap from mixed declarations, narrower in one sense (it doesn't force auditing every block in the file the way declaration-position did) but not fixable by moving code around: the fix, when attempted, will need to replace each compound-literal initializer with explicit field-by-field assignment statements (e.g. cf.cf_flags = 0; cf.cf_feature_version = PY_MINOR_VERSION;) or an equivalent non-compound-literal C89 construct, and — for _PyStatus_OK() / _PyCompilerFlags_INIT specifically — probably wants a header-level macro change (in pycore_initconfig.h / cpython/compile.h) analogous to the _Py_ATOMIC_VC6_X86 gating already used for pycore_atomic.h, rather than a per-call-site rewrite in every .c file that uses these macros, since they are used far more broadly than just Modules/main.c. No such fix is attempted here; it is out of scope for this narrowly-scoped declaration-order pass and is recorded as the next blocker. No link or runtime success is claimed at this or any earlier point in this document.

Update: this blocker (all 8 C2059 sites above) is now resolved for Modules/main.c, via a per-call-site rewrite rather than the header-level macro change speculated above — see "Compound-literal / designated-initializer slice" above for what was actually done and why the per-call-site approach (not the header macro change) was chosen for this narrow slice, and "Next blocker: Python/pylifecycle.c" above for where the same two blocker classes (mixed declarations and compound literals/designated initializers) recur next. This "Current first-blocker evidence" section is kept as a historical record of how the diagnosis proceeded; it is no longer the current state.

Larger blockers to plan for

Build-system mismatch: CPython 3.11's Windows build expects Visual Studio 2017-era MSBuild/vcxproj tooling. VC6 cannot consume the build as-is. A dedicated minimal VC6 makefile/project set is required.
Compiler language gap: CPython 3.11 source and headers use C99-era and later MSVC features that VC6 does not implement. Compatibility macros and carefully scoped source backports are required.
- VC6's C89-only parser rejects CPython's pervasive C99-style mixed declarations-and-code. The instances of this pattern in four Include/internal/pycore_*.h headers reachable from Modules/main.c are fixed (see "Mixed-declarations header slice" above), and the same pattern recurring throughout Modules/main.c's own body (29 error sites across roughly a dozen functions) is also now fixed (see "Modules/main.c declaration-order slice" above). Whether this pattern recurs in CPython's other .c sources has not yet been surveyed; each file would need its own probe-and-fix pass the same way main.c did, not a whole-tree sweep in one change.
- VC6 does not support C99 compound literals or designated initializers at all, independent of declaration position. The 8 sites of this pattern in Modules/main.c itself (_PyStatus_OK(), _PyCompilerFlags_INIT, and inline { .field = value } initialization in Py_Main()/Py_BytesMain()) are now fixed via a per-call-site rewrite, not a header-level macro change (see "Compound-literal / designated-initializer slice" above for why: a public-API function already existed for _PyStatus_OK(), and the other two patterns are cheap to rewrite in place without touching shared headers used far more broadly than main.c). _PyStatus_OK() and _PyCompilerFlags_INIT are still used, unmodified, at many other call sites across CPython outside main.c — this fix is scoped to main.c only, as directed; a header-level VC6 branch (mirroring _Py_ATOMIC_VC6_X86) remains a live option if a future slice finds the per-call-site approach doesn't scale to the rest of the codebase. The same two patterns (mixed declarations and compound literals) both recur in Python/pylifecycle.c, the next core translation unit in main.c's own call chain; see "Next blocker: Python/pylifecycle.c" above. Not yet fixed there.
Win9x API gap: CPython 3.11's Windows layer assumes NT-family Unicode, synchronization, process, filesystem, and networking APIs. Windows 98 has no wide-character file APIs and lacks multiple newer kernel APIs.
Runtime/library gap: SSL, SQLite, ctypes, multiprocessing, asyncio, Unicode filesystem behavior, and parts of subprocess will need explicit feature gates or Win9x-specific implementations.
Validation gap: final success requires booting the built executable on Windows 98 SE; Wine compilation alone is not proof of Win9x runtime compatibility.

Recommended next implementation slice

Do not attempt the complete CPython solution yet. The public header surface compiles; Include/internal/pycore_atomic.h compiles for VC6/_M_IX86 (see "Atomics slice" above); Include/internal/pycore_interp.h's <stdbool.h> include now resolves via the project-local compat/msvc600/stdbool.h shim (see "stdbool slice" above); the C99 mixed-declarations pattern in the four pycore_*.h headers reachable from Modules/main.c is fixed (see "Mixed-declarations header slice" above); that same pattern inside Modules/main.c's own body is fixed (see "Modules/main.c declaration-order slice" above); and the C99 compound-literal/designated-initializer pattern inside Modules/main.c's own body is now also fixed (see "Compound-literal / designated-initializer slice" above). cpython/Modules/main.c now compiles with cl.exe exit status 0 under scripts/vc6-probe-core.sh — no errors, no warnings — a compile-only (/c) result for this one translation unit; no link or runtime claim is made.

The next blocker is still Python/pylifecycle.c, the next core translation unit in main.c's own call chain (via Py_InitializeFromConfig()), but it has advanced past the VC6-incompatible PyRuntime section pragma. See "Next blocker: Python/pylifecycle.c" above for the current probe transcript. It now hits the same two already-solved blocker classes recurring at greater scale (mixed declarations, compound literals/designated initializers), plus enough sites of both to hit the compiler's 100-error cap before the whole file is seen, so the true scope is not yet known. Recommended next steps:

Continue with Python/pylifecycle.c by applying the same two mechanical transforms already validated on Modules/main.c — hoist mid-block declarations (declaration-order slice) and replace compound-literal/

508 KiB Raw Blame History Unescape Escape

Port Status — CPython 3.11.16 to Windows 98 SE

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