CUDA_PTX_COMPILATION

Added in version 3.9.

Compile CUDA sources to .ptx files instead of .obj files within Object Libraries.

For example:

add_library(myptx OBJECT a.cu b.cu)
set_property(TARGET myptx PROPERTY CUDA_PTX_COMPILATION ON)

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https://cmake.org/cmake/help/latest/prop_tgt/CUDA_PTX_COMPILATION.html