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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 platform
import shlex
import sysconfig
from test import support
from setuptools import setup, Extension
SOURCE = 'extension.cpp'
if not support.MS_WINDOWS:
# C++ compiler flags for GCC and clang
CPPFLAGS = [
# gh-91321: The purpose of _testcppext extension is to check that building
# a C++ extension using the Python C API does not emit C++ compiler
# warnings
'-Werror',
]
else:
# Don't pass any compiler flag to MSVC
CPPFLAGS = []
def main():
cppflags = list(CPPFLAGS)
std = os.environ.get("CPYTHON_TEST_CPP_STD", "")
module_name = os.environ["CPYTHON_TEST_EXT_NAME"]
cppflags = list(CPPFLAGS)
cppflags.append(f'-DMODULE_NAME={module_name}')
# Add -std=STD or /std:STD (MSVC) compiler flag
if std:
if support.MS_WINDOWS:
cppflags.append(f'/std:{std}')
else:
cppflags.append(f'-std={std}')
# gh-105776: When "gcc -std=11" is used as the C++ compiler, -std=c11
# option emits a C++ compiler warning. Remove "-std11" option from the
# CC command.
cmd = (sysconfig.get_config_var('CC') or '')
if cmd is not None:
if support.MS_WINDOWS:
std_prefix = '/std'
else:
std_prefix = '-std'
cmd = shlex.split(cmd)
cmd = [arg for arg in cmd if not arg.startswith(std_prefix)]
cmd = shlex.join(cmd)
# CC env var overrides sysconfig CC variable in setuptools
os.environ['CC'] = cmd
# On Windows, add PCbuild\amd64\ to include and library directories
include_dirs = []
library_dirs = []
if support.MS_WINDOWS:
srcdir = sysconfig.get_config_var('srcdir')
machine = platform.uname().machine
pcbuild = os.path.join(srcdir, 'PCbuild', machine)
if os.path.exists(pcbuild):
# pyconfig.h is generated in PCbuild\amd64\
include_dirs.append(pcbuild)
# python313.lib is generated in PCbuild\amd64\
library_dirs.append(pcbuild)
print(f"Add PCbuild directory: {pcbuild}")
# Display information to help debugging
for env_name in ('CC', 'CFLAGS', 'CPPFLAGS'):
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: {cppflags!r}")
ext = Extension(
module_name,
sources=[SOURCE],
language='c++',
extra_compile_args=cppflags,
include_dirs=include_dirs,
library_dirs=library_dirs)
setup(name=f'internal_{module_name}',
version='0.0',
ext_modules=[ext])
if __name__ == "__main__":
main()
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