CMAKE_GENERATOR_TOOLSET

From Get docs
Cmake/docs/3.21/envvar/cmake generator toolset


CMAKE_GENERATOR_TOOLSET

New in version 3.15.


This is a CMake Environment Variable. Its initial value is taken from the calling process environment.

Default value for CMAKE_GENERATOR_TOOLSET if no Cache entry is present and no value is specified by cmake(1) -T option. This value is only applied if CMAKE_GENERATOR is set.

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https://cmake.org/cmake/help/v3.21/envvar/CMAKE_GENERATOR_TOOLSET.html