mirror of https://github.com/python/cpython
93 lines
2.9 KiB
Python
93 lines
2.9 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 contextlib
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import os
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import sys
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import unittest
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import warnings
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from test import support
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from test.support import os_helper
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with warnings.catch_warnings():
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warnings.simplefilter('ignore', DeprecationWarning)
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from distutils.core import setup, Extension
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import distutils.sysconfig
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MS_WINDOWS = (sys.platform == 'win32')
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SOURCE = support.findfile('_testcppext.cpp')
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if not MS_WINDOWS:
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# C++ compiler flags for GCC and clang
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CPPFLAGS = [
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# Python currently targets C++11
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'-std=c++11',
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# gh-91321: The purpose of _testcppext extension is to check that building
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# a C++ extension using the Python C API does not emit C++ compiler
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# warnings
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'-Werror',
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# Warn on old-style cast (C cast) like: (PyObject*)op
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'-Wold-style-cast',
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# Warn when using NULL rather than _Py_NULL in static inline functions
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'-Wzero-as-null-pointer-constant',
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]
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else:
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# Don't pass any compiler flag to MSVC
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CPPFLAGS = []
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@support.requires_subprocess()
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class TestCPPExt(unittest.TestCase):
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def build(self):
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cpp_ext = Extension(
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'_testcppext',
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sources=[SOURCE],
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language='c++',
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extra_compile_args=CPPFLAGS)
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capture_stdout = (not support.verbose)
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try:
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try:
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if capture_stdout:
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stdout = support.captured_stdout()
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else:
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print()
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stdout = contextlib.nullcontext()
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with (stdout,
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support.swap_attr(sys, 'argv', ['setup.py', 'build_ext', '--verbose'])):
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setup(name="_testcppext", ext_modules=[cpp_ext])
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return
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except:
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if capture_stdout:
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# Show output on error
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print()
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print(stdout.getvalue())
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raise
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except SystemExit:
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self.fail("Build failed")
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# With MSVC, the linker fails with: cannot open file 'python311.lib'
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# https://github.com/python/cpython/pull/32175#issuecomment-1111175897
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@unittest.skipIf(MS_WINDOWS, 'test fails on Windows')
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def test_build(self):
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# save/restore os.environ
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def restore_env(old_env):
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os.environ.clear()
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os.environ.update(old_env)
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self.addCleanup(restore_env, dict(os.environ))
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def restore_sysconfig_vars(old_config_vars):
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distutils.sysconfig._config_vars.clear()
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distutils.sysconfig._config_vars.update(old_config_vars)
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self.addCleanup(restore_sysconfig_vars,
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dict(distutils.sysconfig._config_vars))
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# Build in a temporary directory
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with os_helper.temp_cwd():
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self.build()
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if __name__ == "__main__":
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unittest.main()
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