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# gh-91321: Build a basic C test extension to check that the Python C API is
# compatible with C and does not emit C compiler warnings.
import os
import shlex
import sys
import sysconfig
from test import support
from setuptools import setup, Extension
SOURCE = 'extension.c'
if not support.MS_WINDOWS:
# C compiler flags for GCC and clang
CFLAGS = [
# The purpose of test_cext extension is to check that building a C
# extension using the Python C API does not emit C compiler warnings.
'-Werror',
# gh-116869: The Python C API must build with
# -Werror=declaration-after-statement.
'-Werror=declaration-after-statement',
]
else:
# Don't pass any compiler flag to MSVC
CFLAGS = []
def main():
std = os.environ.get("CPYTHON_TEST_STD", "")
module_name = os.environ["CPYTHON_TEST_EXT_NAME"]
limited = bool(os.environ.get("CPYTHON_TEST_LIMITED", ""))
cflags = list(CFLAGS)
cflags.append(f'-DMODULE_NAME={module_name}')
if std:
cflags.append(f'-std={std}')
# Remove existing -std options to only test ours
cmd = (sysconfig.get_config_var('CC') or '')
if cmd is not None:
cmd = shlex.split(cmd)
cmd = [arg for arg in cmd if not arg.startswith('-std=')]
cmd = shlex.join(cmd)
# CC env var overrides sysconfig CC variable in setuptools
os.environ['CC'] = cmd
if limited:
version = sys.hexversion
cflags.append(f'-DPy_LIMITED_API={version:#x}')
for env_name in ('CC', 'CFLAGS'):
if env_name in os.environ:
print(f"{env_name} env var: {os.environ[env_name]!r}")
else:
print(f"{env_name} env var: <missing>")
print(f"extra_compile_args: {cflags!r}")
ext = Extension(
module_name,
sources=[SOURCE],
extra_compile_args=cflags)
setup(name=f'internal_{module_name}',
version='0.0',
ext_modules=[ext])
if __name__ == "__main__":
main()
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