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115 lines
4.5 KiB
Python
115 lines
4.5 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.path
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import shlex
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import shutil
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import subprocess
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import unittest
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from test import support
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SOURCE = os.path.join(os.path.dirname(__file__), 'extension.cpp')
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SETUP = os.path.join(os.path.dirname(__file__), 'setup.py')
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# With MSVC on a debug build, the linker fails with: cannot open file
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# 'python311.lib', it should look 'python311_d.lib'.
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@unittest.skipIf(support.MS_WINDOWS and support.Py_DEBUG,
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'test fails on Windows debug build')
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# Building and running an extension in clang sanitizing mode is not
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# straightforward
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@support.skip_if_sanitizer('test does not work with analyzing builds',
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address=True, memory=True, ub=True, thread=True)
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# the test uses venv+pip: skip if it's not available
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@support.requires_venv_with_pip()
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@support.requires_subprocess()
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@support.requires_resource('cpu')
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class TestCPPExt(unittest.TestCase):
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def test_build(self):
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self.check_build('_testcppext')
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def test_build_cpp03(self):
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# In public docs, we say C API is compatible with C++11. However,
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# in practice we do maintain C++03 compatibility in public headers.
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# Please ask the C API WG before adding a new C++11-only feature.
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self.check_build('_testcpp03ext', std='c++03')
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@support.requires_gil_enabled('incompatible with Free Threading')
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def test_build_limited_cpp03(self):
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self.check_build('_test_limited_cpp03ext', std='c++03', limited=True)
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@unittest.skipIf(support.MS_WINDOWS, "MSVC doesn't support /std:c++11")
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def test_build_cpp11(self):
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self.check_build('_testcpp11ext', std='c++11')
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# Only test C++14 on MSVC.
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# On s390x RHEL7, GCC 4.8.5 doesn't support C++14.
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@unittest.skipIf(not support.MS_WINDOWS, "need Windows")
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def test_build_cpp14(self):
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self.check_build('_testcpp14ext', std='c++14')
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@support.requires_gil_enabled('incompatible with Free Threading')
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def test_build_limited(self):
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self.check_build('_testcppext_limited', limited=True)
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def check_build(self, extension_name, std=None, limited=False):
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venv_dir = 'env'
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with support.setup_venv_with_pip_setuptools(venv_dir) as python_exe:
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self._check_build(extension_name, python_exe,
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std=std, limited=limited)
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def _check_build(self, extension_name, python_exe, std, limited):
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pkg_dir = 'pkg'
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os.mkdir(pkg_dir)
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shutil.copy(SETUP, os.path.join(pkg_dir, os.path.basename(SETUP)))
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shutil.copy(SOURCE, os.path.join(pkg_dir, os.path.basename(SOURCE)))
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def run_cmd(operation, cmd):
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env = os.environ.copy()
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if std:
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env['CPYTHON_TEST_CPP_STD'] = std
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if limited:
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env['CPYTHON_TEST_LIMITED'] = '1'
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env['CPYTHON_TEST_EXT_NAME'] = extension_name
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if support.verbose:
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print('Run:', ' '.join(map(shlex.quote, cmd)))
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subprocess.run(cmd, check=True, env=env)
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else:
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proc = subprocess.run(cmd,
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env=env,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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text=True)
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if proc.returncode:
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print('Run:', ' '.join(map(shlex.quote, cmd)))
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print(proc.stdout, end='')
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self.fail(
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f"{operation} failed with exit code {proc.returncode}")
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# Build and install the C++ extension
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cmd = [python_exe, '-X', 'dev',
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'-m', 'pip', 'install', '--no-build-isolation',
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os.path.abspath(pkg_dir)]
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if support.verbose:
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cmd.append('-v')
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run_cmd('Install', cmd)
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# Do a reference run. Until we test that running python
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# doesn't leak references (gh-94755), run it so one can manually check
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# -X showrefcount results against this baseline.
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cmd = [python_exe,
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'-X', 'dev',
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'-X', 'showrefcount',
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'-c', 'pass']
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run_cmd('Reference run', cmd)
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# Import the C++ extension
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cmd = [python_exe,
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'-X', 'dev',
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'-X', 'showrefcount',
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'-c', f"import {extension_name}"]
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run_cmd('Import', cmd)
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if __name__ == "__main__":
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unittest.main()
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