[issue40574] segfault causing regression from PEP 573 implementation

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I tried to install pyqt5 on Python compiled from source:

make
./python -m venv env
env/bin/python -m pip install sip
env/bin/python -m pip install pyqt5


But I failed to install pyqt5:

vstinner at apu$ env/bin/python -m pip install pyqt5
Collecting pyqt5
/home/vstinner/python/master/env/lib/python3.9/site-packages/pip/_vendor/msgpack/fallback.py:133: DeprecationWarning: encoding is deprecated, Use raw=False instead.
  unpacker = Unpacker(None, max_buffer_size=len(packed), **kwargs)
  Using cached https://files.pythonhosted.org/packages/4d/81/b9a66a28fb9a7bbeb60e266f06ebc4703e7e42b99e3609bf1b58ddd232b9/PyQt5-5.14.2.tar.gz
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... error
    ERROR: Command errored out with exit status 1:
     command: /home/vstinner/python/master/env/bin/python /home/vstinner/python/master/env/lib/python3.9/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmpzl766kxn
         cwd: /tmp/pip-install-a2jym86c/pyqt5
    Complete output (33 lines):
    Traceback (most recent call last):
      File "/home/vstinner/python/master/env/lib/python3.9/site-packages/pip/_vendor/pep517/_in_process.py", line 64, in prepare_metadata_for_build_wheel
        hook = backend.prepare_metadata_for_build_wheel
    AttributeError: module 'sipbuild.api' has no attribute 'prepare_metadata_for_build_wheel'
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/home/vstinner/python/master/env/lib/python3.9/site-packages/pip/_vendor/pep517/_in_process.py", line 207, in <module>
        main()
      File "/home/vstinner/python/master/env/lib/python3.9/site-packages/pip/_vendor/pep517/_in_process.py", line 197, in main
        json_out['return_val'] = hook(**hook_input['kwargs'])
      File "/home/vstinner/python/master/env/lib/python3.9/site-packages/pip/_vendor/pep517/_in_process.py", line 66, in prepare_metadata_for_build_wheel
        return _get_wheel_metadata_from_wheel(backend, metadata_directory,
      File "/home/vstinner/python/master/env/lib/python3.9/site-packages/pip/_vendor/pep517/_in_process.py", line 95, in _get_wheel_metadata_from_wheel
        whl_basename = backend.build_wheel(metadata_directory, config_settings)
      File "/tmp/pip-build-env-w2h9381n/overlay/lib/python3.9/site-packages/sipbuild/api.py", line 51, in build_wheel
        project = AbstractProject.bootstrap('pep517')
      File "/tmp/pip-build-env-w2h9381n/overlay/lib/python3.9/site-packages/sipbuild/abstract_project.py", line 82, in bootstrap
        project.setup(pyproject, tool, tool_description)
      File "/tmp/pip-build-env-w2h9381n/overlay/lib/python3.9/site-packages/sipbuild/project.py", line 410, in setup
        self.apply_user_defaults(tool)
      File "project.py", line 62, in apply_user_defaults
        super().apply_user_defaults(tool)
      File "/tmp/pip-build-env-w2h9381n/overlay/lib/python3.9/site-packages/pyqtbuild/project.py", line 86, in apply_user_defaults
        super().apply_user_defaults(tool)
      File "/tmp/pip-build-env-w2h9381n/overlay/lib/python3.9/site-packages/sipbuild/project.py", line 215, in apply_user_defaults
        self.builder.apply_user_defaults(tool)
      File "/tmp/pip-build-env-w2h9381n/overlay/lib/python3.9/site-packages/pyqtbuild/builder.py", line 67, in apply_user_defaults
        raise PyProjectOptionException('qmake',
    sipbuild.pyproject.PyProjectOptionException
    /home/vstinner/python/master/Lib/tempfile.py:818: ResourceWarning: Implicitly cleaning up <TemporaryDirectory '/tmp/tmpqj0vy32i'>
      _warnings.warn(warn_message, ResourceWarning)
    ----------------------------------------
ERROR: Command errored out with exit status 1: /home/vstinner/python/master/env/bin/python /home/vstinner/python/master/env/lib/python3.9/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmpzl766kxn Check the logs for full command output.

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<https://bugs.python.org/issue40574>
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