[PATCH] D9888: [OPENMP] Driver support for OpenMP offloading

[Jonas Hahnfeld via cfe-commits]

Hahnfeld added a comment.

Currently trying to test, but

1. Offloading to the same target isn't supported (`x86_64-unknown-linux-gnu` as host and device) - this was working with `clang-omp`

The produced IR isn't showing any calls to the target library and on linkage it complains:

  undefined reference to `.omp_offloading.img_start.x86_64-unknown-linux-gnu'
  undefined reference to `.omp_offloading.img_end.x86_64-unknown-linux-gnu'
  undefined reference to `.omp_offloading.entries_begin'
  undefined reference to `.omp_offloading.entries_end'
  undefined reference to `.omp_offloading.entries_begin'
  undefined reference to `.omp_offloading.entries_end'

(btw: `clang-offload-bundler` saves the IR file to `$TMP` with `-S -emit-llvm`, this seems to be a bug - I had to use `--save-temps`)

2. I can't seem to figure out the target triple for NVIDIA GPUs. It should be `nvptx[64]-nvidia-cuda` which gives me

  include/llvm/Option/Option.h:101: const llvm::opt::Option llvm::opt::Option::getAlias() const: Assertion `Info && "Must have a valid info!"' failed.

In `clang-omp` it was `nvptxsm_35-nvidia-cuda` but this is now invalid...


http://reviews.llvm.org/D9888