CMAKE_VS_PLATFORM_TOOLSET_VERSION
Visual Studio Platform Toolset version.
The Visual Studio Generators for VS 2017 and above allow to select minor versions of the same toolset. The toolset version number may be specified by a field in CMAKE_GENERATOR_TOOLSET of the form version=14.11. If none is specified CMake will choose a default toolset. The value may be empty if no minor version was selected and the default is used.
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https://cmake.org/cmake/help/v3.15/variable/CMAKE_VS_PLATFORM_TOOLSET_VERSION.html