gh-154643: Only use __STDC_VERSION__ when defined#154650
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This fixes:
$ g++ -I/usr/include/python3.15 -c -Werror=undef test.cpp
In file included from /usr/include/python3.15/Python.h:68,
from test.cpp:1:
/usr/include/python3.15/pyport.h:494:9: error: ‘__STDC_VERSION__’ is not defined, evaluates to ‘0’ [-Werror=undef]
494 | # elif __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_THREADS__)
| ^~~~~~~~~~~~~~~~
cc1plus: some warnings being treated as errors
For any test.cpp that has #include <Python.h>.
For locating the place for the added test, I used LLM.
The main issue I could reproduce was in Include/pyport.h.
Include/cpython/pyatomic.h was updated for completeness.
Include/internal/mimalloc/mimalloc/atomic.h also has this
but was left untouched as it is code from a bundled project
and is likely not exposed publicly.
Assisted-By: Claude Opus 4.6
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This fixes:
For any test.cpp that has #include <Python.h>.
For locating the place for the added test, I used LLM.
The main issue I could reproduce was in Include/pyport.h. Include/cpython/pyatomic.h was updated for completeness. Include/internal/mimalloc/mimalloc/atomic.h also has this but was left untouched as it is code from a bundled project and is likely not exposed publicly.
Assisted-By: Claude Opus 4.6