[issue31340] Use VS 2017 compiler for build

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

No, but if we need to do 3.6.4 quickly for another reason, let me know and I'll make this change.

It only affects people who are trying to share intermediate build files (which for MSVC purposes, includes static libraries) between their 3.6.2 and 3.6.3 builds. Full builds are going to be fine, and incremental builds should detect the changed tools and be able to rebuild everything. 

So it's solely cases where people are trying to manage the build around distutils rather than letting distutils handle it all that are problematic (and hey, both of these are terrible options! This is why we're discussing how to get people to just stop depending on distutils). I don't think it's worth churning the entire ecosystem just for that.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31340>
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