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Title: GH-137959: fix warning 'visibility' attribute ignored in jit/trampoline.c by chris-eibl · Pull Request #140286 · python/cpython · GitHub

Open Graph Title: GH-137959: fix warning 'visibility' attribute ignored in jit/trampoline.c by chris-eibl · Pull Request #140286 · python/cpython

X Title: GH-137959: fix warning 'visibility' attribute ignored in jit/trampoline.c by chris-eibl · Pull Request #140286 · python/cpython

Description: Since #137961 we're getting this warning /home/runner/work/cpython/cpython/Tools/jit/trampoline.c:13:13: warning: 'visibility' attribute ignored [-Wignored-attributes] 13 | typedef DECLARE_TARGET((*jit_func)); | ^ /home/runner/work/cpython/cpython/Tools/jit/jit.h:11:49: note: expanded from macro 'DECLARE_TARGET' 11 | _Py_CODEUNIT *__attribute__((preserve_none, visibility("hidden"))) \ | ^ 1 warning generated. for all platforms, e.g. https://github.com/python/cpython/actions/runs/18575809544/job/52961278295?pr=140233 except i686-pc-windows-msvc, where this warning has to be suppressed cpython/Tools/jit/_targets.py Lines 583 to 587 in f937468 elif re.fullmatch(r"i686-pc-windows-msvc", host): host = "i686-pc-windows-msvc" condition = "defined(_M_IX86)" # -Wno-ignored-attributes: __attribute__((preserve_none)) is not supported here. args = ["-DPy_NO_ENABLE_SHARED", "-Wno-ignored-attributes"] to silence the many warnings we'd get otherwise, because preserve_none is not supported there. I suggest to use cpython/Tools/jit/jit.h Lines 1 to 4 in f937468 // To use preserve_none in JIT builds, we need to declare a separate function // pointer with __attribute__((preserve_none)), since this attribute may not be // supported by the compiler used to build the rest of the interpreter. typedef jit_func __attribute__((preserve_none)) jit_func_preserve_none; I've verified with a small Godbolt demo and by comparing the emit_trampoline in the generated jit_stencils.h that the generated code remains the same. Issue: gh-137959

Open Graph Description: Since #137961 we're getting this warning /home/runner/work/cpython/cpython/Tools/jit/trampoline.c:13:13: warning: 'visibility' attribute ignored [-Wignored-attributes] 13 | typed...

X Description: Since #137961 we're getting this warning /home/runner/work/cpython/cpython/Tools/jit/trampoline.c:13:13: warning: 'visibility' attribute ignored [-Wignored-attributes] 13...

Opengraph URL: https://github.com/python/cpython/pull/140286

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4a57d8a fix warning 'visibility' attribute ignored chris-eibl Oct 18, 2025 https://github.com/python/cpython/pull/140286/commits/4a57d8a03f22515ee9b43a597e029a777373b18d
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