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Brad King d1b48bfabd CUDA: Add support for CUDA_ARCHITECTURES=native

CUDA 11.6 added the `nvcc -arch=native` flag to automatically compile
for the host GPUs' architectures.  Add support for specifying this
special `native` value in `CMAKE_CUDA_ARCHITECTURES` and
`CUDA_ARCHITECTURES`.  During the compiler ABI detection step,
detect the native architectures so we can pass them explicitly
when using Clang or older versions of nvcc.

Fixes: #22375

2022-03-10 09:27:29 -05:00

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 cuda-arch-native
 ----------------
 * The :variable:`CMAKE_CUDA_ARCHITECTURES` variable and associated
   :prop_tgt:`CUDA_ARCHITECTURES` target property now support the
   special ``native`` value to compile for the architectures(s)
   of the host's GPU(s).