[all-commits] [llvm/llvm-project] d26000: [openmp][devicertl] Freestanding nvptx via stub pr...

[Jon Chesterfield via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d26000e4cc2bc65e207a84fa26cb6e374d60aa12
      https://github.com/llvm/llvm-project/commit/d26000e4cc2bc65e207a84fa26cb6e374d60aa12
  Author: Jon Chesterfield <jonathanchesterfield at gmail.com>
  Date:   2021-08-23 (Mon, 23 Aug 2021)

  Changed paths:
    M openmp/libomptarget/deviceRTLs/nvptx/CMakeLists.txt
    M openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.cu
    M openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.h

  Log Message:
  -----------
  [openmp][devicertl] Freestanding nvptx via stub printf

Compiled nvptx devicertl as freestanding, breaking the
dependency on host glibc and gcc-multilibs. Thus build it by default.

Comes at the cost of #defining out printf. Tried mapping it onto
__builtin_printf but that gets transformed back to printf instead
of hitting the cuda/openmp lowering transform.

Printf could be preserved by one of:
- dropping all the standard headers and ffreestanding
- providing a header only printf implementation
- changing the compiler handling of printf

Reviewed By: grokos

Differential Revision: https://reviews.llvm.org/D108349