CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTUREΒΆ
Added in version 3.8.
Visual Studio preferred tool architecture.
The Visual Studio Generators for VS 2013 and above support using
either the 32-bit or 64-bit host toolchains by specifying a host=x86
or host=x64 value in the CMAKE_GENERATOR_TOOLSET option.
CMake provides the selected toolchain architecture preference in this
variable (x86, x64, ARM64 or empty).