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_ctypes fails to import on NetBSD due to a missing alloca symbol #134486

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collinfunk opened this issue May 22, 2025 · 0 comments
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_ctypes fails to import on NetBSD due to a missing alloca symbol #134486

collinfunk opened this issue May 22, 2025 · 0 comments
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OS-netbsd topic-ctypes type-bug An unexpected behavior, bug, or error

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collinfunk commented May 22, 2025 •
edited by bedevere-app bot
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Bug report

Bug description:

After running ./configure && gmake on a NetBSD 10 machine, the build finishes with the following warning:

Written build/lib.netbsd-10.0-evbarm-3.15/_sysconfigdata__netbsd10_.py
Written build/lib.netbsd-10.0-evbarm-3.15/_sysconfig_vars__netbsd10_.json
./python -E -c 'import sys ; from sysconfig import get_platform ; print("%s-%d.%d" % (get_platform(), *sys.version_info[:2]))' >platform
./python -E ./Tools/build/generate-build-details.py `cat pybuilddir.txt`/build-details.json
[ERROR] _ctypes failed to import: /home/collinfunk/cpython/build/lib.netbsd-10.0-evbarm-3.15/_ctypes.cpython-315.so: Undefined PLT symbol "alloca" (symnum = 48)

This is due to an incomplete check for alloca in the _ctypes.h module.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Other

Linked PRs
@collinfunk collinfunk added the type-bug An unexpected behavior, bug, or error label May 22, 2025
collinfunk added a commit to collinfunk/cpython that referenced this issue May 22, 2025
@collinfunk
pythongh-134486: Fix missing alloca symbol in _ctypes on NetBSD.
46b0d9d 
Previously the module would fail to load because the ``alloca`` symbol
was undefined. Now we check for GCC/Clang builtins for systems who do
not define ``alloca`` in headers.
@bedevere-app bedevere-app bot mentioned this issue May 22, 2025
Merged
@AA-Turner AA-Turner changed the title _ctypes fails to import on NetBSD due to a missing alloca symbol _ctypes fails to import on NetBSD due to a missing alloca symbol May 22, 2025
collinfunk added a commit to collinfunk/cpython that referenced this issue May 23, 2025
@collinfunk
pythongh-134486: Fix missing alloca symbol in _ctypes on NetBSD.
2103a25 
Previously the module would fail to load because the ``alloca`` symbol
was undefined. Now we check for GCC/Clang builtins for systems who do
not define ``alloca`` in headers.
collinfunk added a commit to collinfunk/cpython that referenced this issue May 23, 2025
@collinfunk
pythongh-134486: Fix missing alloca symbol in _ctypes on NetBSD.
93f6e60 
Previously the module would fail to load because the ``alloca`` symbol
was undefined. Now we check for GCC/Clang builtins for systems who do
not define ``alloca`` in headers.
vstinner pushed a commit that referenced this issue May 23, 2025
@collinfunk
gh-134486: Fix missing alloca() symbol in _ctypes on NetBSD (#134487)
b8f5526 
Previously the module would fail to load because the `alloca()` symbol
was undefined. Now we check for GCC/Clang builtins for systems who do
not define `alloca()` in headers.
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@vstinner @AA-Turner @furkanonder @collinfunk