Visual Studio Platform Toolset name.
VS 10 and above use MSBuild under the hood and support multiple compiler toolchains. CMake may specify a toolset explicitly, such as v110 for VS 11 or Windows7.1SDK for 64-bit support in VS 10 Express. CMake provides the name of the chosen toolset in this variable.
See the CMAKE_GENERATOR_TOOLSET variable for details.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_VS_PLATFORM_TOOLSET.html