GH-139922: Tail calling for MSVC (VS 2026)#143068

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python:mainfrom

chris-eibl:msvc-tail-call-new

Dec 22, 2025

Commits on Dec 21, 2025

rebased + _Py_VectorCallInstrumentation_StackRefSteal
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Merge commit '374874c3e6d8c4745a52b3bc22044db607b2c9e7' into msvc-tail-call-new
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Commits on Dec 22, 2025

try to fix MSVC tail call CI
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Alternative to restrict and conditional Py_NO_INLINE for PyMapping_GetOptionalItem
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make _PyMapping_GetOptionalItem2 private and comment scopes
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Merge with main because aarch64 jit builds started failing
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Apply suggestions from code review
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Update .github/workflows/tail-call.yml
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enable "Emulated Windows Clang (release)"
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Merge remote-tracking branch 'upstream/main' into msvc-tail-call-new
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revert to cmd but keep Hugo's other changes
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