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gh-154643: Only use __STDC_VERSION__ when defined #154650

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gh-154643: Only use __STDC_VERSION__ when defined #154650

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2 changes: 1 addition & 1 deletion Include/cpython/pyatomic.h
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Original file line number Diff line number Diff line change
Expand Up @@ -582,7 +582,7 @@ static inline void _Py_atomic_fence_release(void);
# define Py_ATOMIC_GCC_H
# include "pyatomic_gcc.h"
# undef Py_ATOMIC_GCC_H
#elif __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_ATOMICS__)
#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_ATOMICS__)
# define Py_ATOMIC_STD_H
# include "pyatomic_std.h"
# undef Py_ATOMIC_STD_H
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2 changes: 1 addition & 1 deletion Include/pyport.h
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Expand Up @@ -491,7 +491,7 @@ extern "C" {
#ifdef WITH_THREAD
# ifdef thread_local
# define _Py_thread_local thread_local
# elif __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_THREADS__)
# elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_THREADS__)
# define _Py_thread_local _Thread_local
# elif defined(_MSC_VER) /* AKA NT_THREADS */
# define _Py_thread_local __declspec(thread)
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5 changes: 5 additions & 0 deletions Lib/test/test_cppext/__init__.py
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Expand Up @@ -134,6 +134,11 @@ def test_build_cpp14(self):
def test_build_intel_asm(self):
self.check_build('_testcppext_asm', extra_cflags='-masm=intel')

# gh-154643: Test that headers don't use undefined macros in #if
@unittest.skipIf(support.MS_WINDOWS, "MSVC doesn't support -Werror=undef")
def test_build_werror_undef(self):
self.check_build('_testcppext_undef', extra_cflags='-Werror=undef')


class TestInteralCAPI(BaseTests, unittest.TestCase):
TEST_INTERNAL_C_API = True
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/C_API/2026-07-24-22-30-40.gh-issue-154643.z-ZutK.rst
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@@ -0,0 +1,2 @@
In ``pyport.h`` and ``pyatomic.h`` don't use ``__STDC_VERSION__`` when it is
not defined, fixing build errors for C++ code built with ``-Werror=undef``.
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