MSVC_VERSIONΒΆ
The version of Microsoft Visual C/C++ being used if any.
If a compiler simulating Visual C++ is being used, this variable is set
to the toolset version simulated as given by the _MSC_VER
preprocessor definition.
Known version numbers are:
1200      = VS  6.0
1300      = VS  7.0
1310      = VS  7.1
1400      = VS  8.0 (v80 toolset)
1500      = VS  9.0 (v90 toolset)
1600      = VS 10.0 (v100 toolset)
1700      = VS 11.0 (v110 toolset)
1800      = VS 12.0 (v120 toolset)
1900      = VS 14.0 (v140 toolset)
1910-1919 = VS 15.0 (v141 toolset)
1920-1929 = VS 16.0 (v142 toolset)
1930-1949 = VS 17.0 (v143 toolset)
See also the  CMAKE_<LANG>_COMPILER_VERSION and
MSVC_TOOLSET_VERSION variable.
