New in version 3.9.
NVIDIA CUDA Toolkit version whose Visual Studio toolset to use.
The Visual Studio Generators for VS 2010 and above support using a CUDA toolset provided by a CUDA Toolkit. The toolset version number may be specified by a field in CMAKE_GENERATOR_TOOLSET of the form cuda=8.0. Or it is automatically detected if a path to a standalone CUDA directory is specified in the form cuda=C:\path\to\cuda. If none is specified CMake will choose a default version. CMake provides the selected CUDA toolset version in this variable. The value may be empty if no CUDA Toolkit with Visual Studio integration is installed.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_VS_PLATFORM_TOOLSET_CUDA.html