dependencies/cuda: Add support for disabling the cuda runtime

[dcbaker]

No description provided.

[dcbaker]

@karolherbst: Could you see if this works for you? I don't have a way to really test Cuda stuff

[karolherbst]

@dcbaker

Could not read CUDA Toolkit's version file /usr/local/cuda-12.2/version.txt: [Errno 2] No such file or directory: '/usr/local/cuda-12.2/version.txt'
Falling back to extracting version from path
Could not read CUDA Toolkit's version file /usr/local/cuda-12.4/version.txt: [Errno 2] No such file or directory: '/usr/local/cuda-12.4/version.txt'
Falling back to extracting version from path
Could not read CUDA Toolkit's version file /usr/local/cuda-12.6/version.txt: [Errno 2] No such file or directory: '/usr/local/cuda-12.6/version.txt'
Falling back to extracting version from path
Could not read CUDA Toolkit's version file /usr/local/cuda-12.9/version.txt: [Errno 2] No such file or directory: '/usr/local/cuda-12.9/version.txt'
Could not read CUDA Toolkit's version file /usr/local/cuda-12.8/version.txt: [Errno 2] No such file or directory: '/usr/local/cuda-12.8/version.txt'
Falling back to extracting version from path
Could not read CUDA Toolkit's version file /usr/local/cuda/version.txt: [Errno 2] No such file or directory: '/usr/local/cuda/version.txt'
Could not read CUDA Toolkit's version file /usr/local/cuda-12/version.txt: [Errno 2] No such file or directory: '/usr/local/cuda-12/version.txt'
Could not read CUDA Toolkit's version file /usr/local/cuda-13.0/version.txt: [Errno 2] No such file or directory: '/usr/local/cuda-13.0/version.txt'
Could not read CUDA Toolkit's version file /usr/local/cuda-13/version.txt: [Errno 2] No such file or directory: '/usr/local/cuda-13/version.txt'
Search paths: [('/usr/local/cuda', '13.0', True), ('/usr/local/cuda-13.0', '13.0', False), ('/usr/local/cuda-13', '13.0', False), ('/usr/local/cuda-12.9', '12.9', False), ('/usr/local/cuda-12', '12.9', False), ('/usr/local/cuda-12.8', '12.8', False), ('/usr/local/cuda-12.6', '12.6', False), ('/usr/local/cuda-12.4', '12.4', False), ('/usr/local/cuda-12.2', '12.2', False)]
CUDA library directory is /usr/local/cuda/targets/x86_64-linux/lib
Link args for CUDA module 'cuda' are ['/usr/local/cuda/targets/x86_64-linux/lib/stubs/libcuda.so']
Dependency lookup for cuda with method 'system' failed: Couldn't find requested CUDA module 'cudart_none'
Run-time dependency CUDA found: NO 

../meson.build:1596:16: ERROR: Dependency lookup for cuda with method 'system' failed: Couldn't find requested CUDA module 'cudart_none'

[eli-schwartz]

/cc @SoapGentoo @obilaniu @MaxandreOgeret for general interest in cuda support. Thoughts?

[MaxandreOgeret]

lgtm its useful too

[dcbaker]

Okay, I set up enough Cuda in a container to be able to do a compile test. I still have no idea if this actually works, and no idea how to write a test for it.

[karolherbst]

Okay, I set up enough Cuda in a container to be able to do a compile test. I still have no idea if this actually works, and no idea how to write a test for it.

could take inspirations from https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37831 🙃

I'll check your changes tomorrow or so..

but I think the simplest way to check it works is to just have an example program calling into cuInit(0) and maybe even cuDriverGetVersion to make sure you got the expected version... I think both those APIs should work without any actual GPU in the system.