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Tue Sep 1 18:15:56 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-September/141412.html

On 01Sep2015 0747, Oscar Benjamin wrote:
> Thanks for the detailed writeup Steve. Do you know how these changes
> to the python.org Windows binaries would impact on people building
> extension modules with MinGW?

Currently, no version of MinGW AFAIK will link against the UCRT, so 
they'll suffer from the same mixed-CRT issues as with any other 
arrangement. There is some work going towards making mingw-w64 work with 
UCRT, but I am not following it closely despite occasional contact with 
the dev(s) working on it.

> I think that some extension module authors use MinGW for their Windows
> binaries because then a single compiler installation can compile for
> multiple Python versions and link against whichever msvcrtXX.dll is
> needed. For example in the numpy release notes [1]:
> "The MinGW compilers used to build the official Numpy binary
> installers for 32-bit Python on Windows can be found in
> https://github.com/numpy/numpy-vendor."
>
> Perhaps it would be good to verify that the numpy MinGW build
> instructions still work?

I'd love it for someone to do that. My MinGW skills are so poor though 
that all I'd be verifying is whether I messed up or not :). Certainly 
most of numpy builds fine with MSVC - it's just the optimized Fortran 
pieces that require either Intel's compiler (to link against MSVC) or a 
complete switch to gcc.

Cheers,
Steve

> [1] https://github.com/numpy/numpy/blob/master/INSTALL.txt#L118
>
> --
> Oscar
>

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[Python-Dev] Building Extensions for Python 3.5 on Windows