MSVC14

From Get docs
Cmake/docs/3.21/variable/msvc14


MSVC14

New in version 3.1.


Discouraged. Use the MSVC_VERSION variable instead.

True when using the Microsoft Visual Studio v140 or v141 toolset (cl version 19) or another compiler that simulates it.

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https://cmake.org/cmake/help/v3.21/variable/MSVC14.html