[issue43816] Missing 'extern "C"' for _Py_ctype_table

[Stefan Behnel]

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

The macros were moved to "Includes/cpython/", not to "Includes/internal/". That suggests to me that they should use "extern C", so that C++ code that wants to make use of CPython internals can use them.

Basically, the way I see it, *all* header files in "Includes/" and "Includes/cpython/" should work with C++ code and thus have an "extern C". Only the header files in "Includes/internal/" should not have them.

Regardless, I've removed the macro usage from Cython so that the current state doesn't hurt our users.

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<https://bugs.python.org/issue43816>
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