[Openmp-commits] [PATCH] D95466: [OpenMP][NVPTX] Drop dependence on CUDA to build NVPTX `deviceRTLs`

[Shilei Tian via Phabricator via Openmp-commits]

tianshilei1992 created this revision.
tianshilei1992 added reviewers: jdoerfert, JonChesterfield.
Herald added subscribers: guansong, yaxunl, mgorny, jholewinski.
tianshilei1992 requested review of this revision.
Herald added subscribers: openmp-commits, sstefan1.
Herald added a project: OpenMP.

With D94745 <https://reviews.llvm.org/D94745>, we no longer use CUDA SDK to compile `deviceRTLs`. Therefore,
many CMake code in the project is useless. This patch cleans up unnecessary code
and also drops the requirement to build NVPTX `deviceRTLs`. CUDA detection is
still being used however to determine whether we need to involve the tests. Auto
detection of compute capability is enabled by default and can be disabled by
setting CMake variable `LIBOMPTARGET_NVPTX_AUTODETECT_COMPUTE_CAPABILITY=OFF`.
If auto detection is enabled, and CUDA is also valid, it will only build the
bitcode library for the detected version; otherwise, all variants supported will
be generated. One drawback of this patch is, we now generate 96 variants of
bitcode library, and totally 1485 files to be built with a clean build on a
non-CUDA system. `LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES=""` can be used to
disable building NVPTX `deviceRTLs`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95466

Files:
  openmp/README.rst
  openmp/libomptarget/cmake/Modules/LibomptargetGetDependencies.cmake
  openmp/libomptarget/cmake/Modules/LibomptargetNVPTXBitcodeLibrary.cmake
  openmp/libomptarget/deviceRTLs/nvptx/CMakeLists.txt

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