[issue17592] mingw: configure MACHDEP and platform for build

[Martin Panter]

Martin Panter added the comment:

Here is a modified patch fixing a couple of the spelling & style problems. I moved the comment introducing the ac_sys_ variables up to before the code that sets them. I rearranged the logic for _PYTHON_HOST_PLATFORM so it is clear that $host_os overrides $host, and I combined the cygwin and mingw cases.

I suspect the configure.ac logic could be simplified more.

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Added file: http://bugs.python.org/file42142/MINGW-MACHDEP.v2.patch

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