Windows MinGW-w64 pointer-integer size mismatch in extensions

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Migrated from rt.perl.org#128647 (status was 'new')

Searchable as RT128647$

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From @dcollinsn

There seems to be some issue with getting information from building core to building extensions in the build process. When building with the x86_64 mingw-w64.org version of GCC 4.9.3, I get a wide variety of compiler warnings, including​:

Storable.xs​:534​:3​: warning​: cast from pointer to integer of different size [-Wpointer-to-int-cast]

These are confined to POSIX.c, POSIX.xs, Socket.xs, and Storable.xs. Notably, there are no warnings like this in core, meaning that core agrees that PTRSIZE == IVSIZE == sizeof(IV*) == sizeof(IV) == 8.

I've attached the relevant makefile.mk as well as a full log of dmake. Amazingly the tests do all pass, but these warnings in particular are concerning.

--
Respectfully,
Dan Collins

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From @dcollinsn

makefile.mk

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From @dcollinsn

mingw-w64-x86_64-4.9.3-dmake.txt