[CMake] Appending to CMAKE_CXX_FLAGS

[Innokentiy Alaytsev]

Hello!

Did you consider adding the flag manually during project configuration? I do
not know you use case, but after some thinking about the best way of
achieving multiprocess compilation under MSVS with CMake I decided, that the
simplest, most portable and flexible is to just add this flag manually. One
of the reasons for such a decision is that I do not know how the project may
be built and multiprocess compilation may cause problems under some hardware
configurations.

Best regards,
Innokentiy



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