[CMake] FindCUDA - creating .ptx and .cubin files as final build target

[Alex G]

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I have a project that I'm converting from plain ole' makefile to cmake.
I need to have the build result be .ptx and .cubin (both, as the app
attempts to read the .cubin first, and if it's incompatible with the GPU
architecture, assemble the .ptx file).

The way I did it with the ole' makefile approach was to invoke nvcc
- --ptx on File1.cu and File2.cu, and then invoke nvcc --cubin on the
resulting File1.ptx, and File2.ptx. The latter step created File1.cubin,
and File2.cubin.

I've looked over the documentation of FindCUDA, and it seemed that
CUDA_COMPILE and CUDA_COMPILE_PTX might be my best bets; however, I
can't figure out how to set targets to be .ptx, or .cubin files.
CUDA_ADD_LIBRARY wants to generate an (empty) object library, which only
adds headaches, as the project compilation fails when gcc is invoked to
create these libs. This is both redundant and annoying.

I only need the .ptx and .cubin files. I would greatly appreciate a hint
or pointers.

Alex
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