Antti Haapala <an...@haapala.name> added the comment:

I don't have GCC 8 so I cannot verify this bug, but *function pointer casts* 
are fine - any function pointer can be cast to any other function pointer - it 
is only that they must *not* be called unless cast back again to be compatible 
with the function definition. Any fix to the contrary might well *cause* 
undefined behaviour!

Could you provide a sample of the *actual warnings* so that they could be 
studied?

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nosy: +ztane

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33012>
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