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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 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
BASE_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',
]
# C compiler flags for GCC and clang
PUBLIC_CFLAGS = [
*BASE_CFLAGS,
# gh-120593: Check the 'const' qualifier
'-Wcast-qual',
# Ask for strict(er) compliance with the standard
'-pedantic-errors',
]
if not support.Py_GIL_DISABLED:
PUBLIC_CFLAGS.append(
# gh-116869: The Python C API must be compatible with building
# with the -Werror=declaration-after-statement compiler flag.
'-Werror=declaration-after-statement',
)
INTERNAL_CFLAGS = [*BASE_CFLAGS]
else:
# MSVC compiler flags
BASE_CFLAGS = [
# Treat all compiler warnings as compiler errors
'/WX',
]
PUBLIC_CFLAGS = [
*BASE_CFLAGS,
# Display warnings level 1 to 4
'/W4',
]
INTERNAL_CFLAGS = [
*BASE_CFLAGS,
# Display warnings level 1 to 3
'/W3',
]
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", ""))
internal = bool(int(os.environ.get("TEST_INTERNAL_C_API", "0")))
sources = [SOURCE]
if not internal:
cflags = list(PUBLIC_CFLAGS)
else:
cflags = list(INTERNAL_CFLAGS)
cflags.append(f'-DMODULE_NAME={module_name}')
# Add -std=STD or /std:STD (MSVC) compiler flag
if std:
if support.MS_WINDOWS:
cflags.append(f'/std:{std}')
else:
cflags.append(f'-std={std}')
# Remove existing -std or /std options from CC command line.
# Python adds -std=c11 option.
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
# Define Py_LIMITED_API macro
if limited:
version = sys.hexversion
cflags.append(f'-DPy_LIMITED_API={version:#x}')
if internal:
cflags.append('-DTEST_INTERNAL_C_API=1')
# 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: {cflags!r}")
ext = Extension(
module_name,
sources=sources,
extra_compile_args=cflags,
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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