[all-commits] [llvm/llvm-project] ae20ff: [libc] Add check for locally installed GPUs

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ae20ff7526212598f4bbe193575560e435ab2707
      https://github.com/llvm/llvm-project/commit/ae20ff7526212598f4bbe193575560e435ab2707
  Author: Joseph Huber <jhuber6 at vols.utk.edu>
  Date:   2022-12-20 (Tue, 20 Dec 2022)

  Changed paths:
    M libc/cmake/modules/prepare_libc_gpu_build.cmake

  Log Message:
  -----------
  [libc] Add check for locally installed GPUs

We need to know which, if any, GPUs the user has on their system if we
want to be able to test the `libc` source code for the GPU. This patch
adds a basic check using the `amdgpu-arch` utility which is provided by
`clang`.

Checking for NVIDIA GPUs will be done later as this is a little
problematic right now. CMake provides a method that we use for Clang but
it will soon be deprecated, the replacement requires a newer CMake
version that we will have in the LLVM 17 branch in the future. CUDA also
provides `__nvcc_device_query` but it's very new so I'm not sure if we
should rely on it. I may introduce a new tool to do it similar to
`amdgpu-arch`.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D140422