[issue32973] Importing the same extension module under multiple names breaks non-reinitialisable extension modules

[Stefan Behnel]

Stefan Behnel <stefan_ml at behnel.de> added the comment:

FYI, I've updated Cython's module import checks to include an interpreter check. This (multi-file) test shows the new behaviour, which is to raise an ImportError on module creation when it detects a different interpreter than during the initial import:

https://github.com/cython/cython/blob/master/tests/run/reimport_from_subinterpreter.srctree

The checks are implemented here (and called a bit further down in the module create function):
https://github.com/cython/cython/blob/4ce754271ff4cfbd8df2b278e812154fb1b02319/Cython/Utility/ModuleSetupCode.c#L909-L932

I also added a test that should match the problem discussed here, which makes what I described appear as a viable solution (or work-around):

https://github.com/cython/cython/blob/master/tests/run/reimport_from_package.srctree

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<https://bugs.python.org/issue32973>
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