[cfe-dev] VS2019 + LLVM Toolchain Plugin Support

[degski via cfe-dev]

Hi [Zachary],

I recently cleaned up my VS-installs, i.e. removed both VS17 and VS19
(which were installed side-by-side up till then] and ran into an
installation problem. Previously, with both VS17 and VS19 installed, the
plugin worked 'just fine' both in VS17 and VS19. Now with only VS19
installed, the plugin does not register in VS19 [resulting in tool-chain
not installed error]. This behavior I also observed with the old style
integration (Clang-7) with VS15 and VS17 (that's how we got the plugin
published, when I reported that problem). VS19 pulls in everything
installed in VS19, that's how the old style integration kept working as
well.

I have posted the install log to pastebin [0], in which you can see that
VS19 is actually not "supported" according to it's settings/parameters.
I've tried to fix these vc17's and changed them to vc19's, throughout, but
that doesn't do the trick [locations of files seem to be different as
well]. In other words I cannot fix it as I don't understand well enough
what should be fixed and to what.

Would be great to get it working again.

Have a good day,

degski
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[0]: https://pastebin.com/uSakXYBu
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