mirror of
https://github.com/python/cpython.git
synced 2026-05-06 20:51:17 -04:00
Steve Dower
142 lines
4.2 KiB
Python
142 lines
4.2 KiB
Python
# gh-91321: Build a basic C test extension to check that the Python C API is
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# compatible with C and does not emit C compiler warnings.
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import os
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import shlex
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import sys
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import sysconfig
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from test import support
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from setuptools import setup, Extension
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SOURCE = 'extension.c'
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if not support.MS_WINDOWS:
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# C compiler flags for GCC and clang
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BASE_CFLAGS = [
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# The purpose of test_cext extension is to check that building a C
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# extension using the Python C API does not emit C compiler warnings.
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'-Werror',
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# Enable extra checks for header files, which:
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# - need to be enabled somewhere inside Python headers (rather than
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# before including Python.h)
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# - should not be checked for user code
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'-D_Py_IS_TESTCEXT',
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]
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# C compiler flags for GCC and clang
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PUBLIC_CFLAGS = [
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*BASE_CFLAGS,
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# gh-120593: Check the 'const' qualifier
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'-Wcast-qual',
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# Ask for strict(er) compliance with the standard
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'-pedantic-errors',
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]
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if not support.Py_GIL_DISABLED:
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PUBLIC_CFLAGS.append(
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# gh-116869: The Python C API must be compatible with building
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# with the -Werror=declaration-after-statement compiler flag.
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'-Werror=declaration-after-statement',
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)
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INTERNAL_CFLAGS = [*BASE_CFLAGS]
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else:
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# MSVC compiler flags
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BASE_CFLAGS = [
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# Treat all compiler warnings as compiler errors
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'/WX',
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]
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PUBLIC_CFLAGS = [
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*BASE_CFLAGS,
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# Display warnings level 1 to 4
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'/W4',
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]
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INTERNAL_CFLAGS = [
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*BASE_CFLAGS,
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# Display warnings level 1 to 3
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'/W3',
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]
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def main():
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std = os.environ.get("CPYTHON_TEST_STD", "")
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module_name = os.environ["CPYTHON_TEST_EXT_NAME"]
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limited = bool(os.environ.get("CPYTHON_TEST_LIMITED", ""))
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abi3t = bool(os.environ.get("CPYTHON_TEST_ABI3T", ""))
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internal = bool(int(os.environ.get("TEST_INTERNAL_C_API", "0")))
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incdirs = os.environ.get("CPYTHON_EXTRA_INCDIRS", "")
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libdirs = os.environ.get("CPYTHON_EXTRA_LIBDIRS", "")
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sources = [SOURCE]
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if not internal:
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cflags = list(PUBLIC_CFLAGS)
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else:
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cflags = list(INTERNAL_CFLAGS)
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cflags.append(f'-DMODULE_NAME={module_name}')
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# Add -std=STD or /std:STD (MSVC) compiler flag
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if std:
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if support.MS_WINDOWS:
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cflags.append(f'/std:{std}')
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else:
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cflags.append(f'-std={std}')
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# Remove existing -std or /std options from CC command line.
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# Python adds -std=c11 option.
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cmd = (sysconfig.get_config_var('CC') or '')
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if cmd is not None:
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if support.MS_WINDOWS:
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std_prefix = '/std'
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else:
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std_prefix = '-std'
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cmd = shlex.split(cmd)
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cmd = [arg for arg in cmd if not arg.startswith(std_prefix)]
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cmd = shlex.join(cmd)
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# CC env var overrides sysconfig CC variable in setuptools
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os.environ['CC'] = cmd
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# Define opt-in macros
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if limited:
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cflags.append(f'-DPy_LIMITED_API={sys.hexversion:#x}')
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if abi3t:
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cflags.append(f'-DPy_TARGET_ABI3T={sys.hexversion:#x}')
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if internal:
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cflags.append('-DTEST_INTERNAL_C_API=1')
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# Add additional include and library directories, typically for in-tree
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# testing where not all directories are inferred
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include_dirs = []
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library_dirs = []
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if incdirs:
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print("Add incdirs:", incdirs)
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include_dirs.extend(incdirs.split(os.pathsep))
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if libdirs:
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print("Add libdirs:", libdirs)
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library_dirs.extend(libdirs.split(os.pathsep))
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# Display information to help debugging
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for env_name in ('CC', 'CFLAGS', 'CPPFLAGS'):
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if env_name in os.environ:
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print(f"{env_name} env var: {os.environ[env_name]!r}")
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else:
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print(f"{env_name} env var: <missing>")
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print(f"extra_compile_args: {cflags!r}")
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ext = Extension(
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module_name,
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sources=sources,
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extra_compile_args=cflags,
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include_dirs=include_dirs,
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library_dirs=library_dirs)
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setup(name=f'internal_{module_name}',
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version='0.0',
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ext_modules=[ext])
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if __name__ == "__main__":
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main()
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