Support an "auto" or similarly-named option for CUDA_ARCHITECTURES
At the moment, if you want to build a CUDA application target your own system's GPU, you need to either manually specify the architecture, e.g.
set_property(TARGET tgt PROPERTY CUDA_ARCHITECTURES 70)or use the CUDA_SELECT_NVCC_ARCH_FLAGS mechanism (see also this issue).
That is too cumbersome. I don't see any reason why the following shouldn't work:
set_property(TARGET tgt PROPERTY CUDA_ARCHITECTURES auto)which would just perform the equivalent of CUDA_SELECT_NVCC_ARCH_FLAGS behind the scenes (with caching of course).
Bikeshedding: Capitalization (auto? Auto? AUTO)? Use of system or system-devices or system-gpus or available-gpus?
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