[CMake] CMake support for MYS2

Mon Jan 8 06:35:33 EST 2018

Dear CMake developers,

I installed msys2 from http://www.msys2.org/ and (after updating etc)
installed cmake via
    pacman -S cmake
as well as some other packages like "make", the gcc compiler etc.

But "ccmake" complains:

 System is unknown to cmake, create:
 Platform/MINGW32_NT-6.1 to use this system, please send your config file to
 cmake at www.cmake.org so it can be added to cmake

 Your CMakeCache.txt file was copied to CopyOfCMakeCache.txt. Please
send that file to
 cmake at www.cmake.org.

I believe I should additional set the compiler somehow, but I guess I
should be able to cope with that part. I just wanted to report the
failure to identify the platform while fighting with other problems.
(Meson works correctly out of the box.)

CopyOfCMakeCache is in attachment.

Thank you very much,
    Mojca
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