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https://github.com/python/cpython
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106 lines
3.5 KiB
Python
106 lines
3.5 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 sys
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import unittest
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import subprocess
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import sysconfig
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from test import support
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from test.support import os_helper
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MS_WINDOWS = (sys.platform == 'win32')
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SETUP_TESTCPPEXT = support.findfile('setup_testcppext.py')
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@support.requires_subprocess()
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class TestCPPExt(unittest.TestCase):
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def test_build_cpp11(self):
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self.check_build(False, '_testcpp11ext')
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def test_build_cpp03(self):
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self.check_build(True, '_testcpp03ext')
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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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# Building and running an extension in clang sanitizing mode is not
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# straightforward
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@unittest.skipIf(
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'-fsanitize' in (sysconfig.get_config_var('PY_CFLAGS') or ''),
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'test does not work with analyzing builds')
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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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def check_build(self, std_cpp03, extension_name):
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# Build in a temporary directory
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with os_helper.temp_cwd():
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self._check_build(std_cpp03, extension_name)
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def _check_build(self, std_cpp03, extension_name):
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venv_dir = 'env'
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verbose = support.verbose
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# Create virtual environment to get setuptools
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cmd = [sys.executable, '-X', 'dev', '-m', 'venv', venv_dir]
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if verbose:
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print()
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print('Run:', ' '.join(cmd))
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subprocess.run(cmd, check=True)
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# Get the Python executable of the venv
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python_exe = 'python'
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if sys.executable.endswith('.exe'):
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python_exe += '.exe'
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if MS_WINDOWS:
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python = os.path.join(venv_dir, 'Scripts', python_exe)
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else:
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python = os.path.join(venv_dir, 'bin', python_exe)
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def run_cmd(operation, cmd):
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if verbose:
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print('Run:', ' '.join(cmd))
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subprocess.run(cmd, check=True)
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else:
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proc = subprocess.run(cmd,
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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(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 the C++ extension
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cmd = [python, '-X', 'dev',
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SETUP_TESTCPPEXT, 'build_ext', '--verbose']
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if std_cpp03:
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cmd.append('-std=c++03')
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run_cmd('Build', cmd)
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# Install the C++ extension
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cmd = [python, '-X', 'dev',
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SETUP_TESTCPPEXT, 'install']
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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,
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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,
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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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