[llvm-dev] Executing OpenMP 4.0 code on Nvidia's GPU

[Ahmed ElTantawy via llvm-dev]

Hi Alexey,

I was actually using clang-omp. As I pointed in my email, I went through
the steps from this same link (
https://parallel-computing.pro/index.php/9-cuda/43-openmp-4-0-on-nvidia-cuda-gpus),
and I still get this linking error.




On Tue, Jan 19, 2016 at 7:08 PM, Bataev, Alexey <a.bataev at gmx.com> wrote:

> Hi,
> Did you tried it on clang/LLVM built from trunk? Trunk version does not
> support offloading yet (it is under development now). Use clang/LLVM from
> clang-omp.github.com, as pointed in
> https://parallel-computing.pro/index.php/9-cuda/43-openmp-4-0-on-nvidia-cuda-gpus
>
> Best regards,
> Alexey Bataev
> =============
> Software Engineer
> Intel Compiler Team
> Intel Corp.
>
> 20.01.2016 1:42, Ahmed ElTantawy via llvm-dev пишет:
>
> Hi,
>
> I was trying to execute an OpenMP 4.0 code on GPU with the offloading
> supported now. I went through the steps described here
> <https://parallel-computing.pro/index.php/9-cuda/43-openmp-4-0-on-nvidia-cuda-gpus>.
> But I get these linking errors during compilation:
>
>
> LIBRARY_PATH=/home/ahmed/ahmed_home/openmp4/llvm/build/bin/../lib
> clang-3.8 -fopenmp -omptargets=nvptx64sm_30-nvidia-linux -g -O3 -std=c99
> example.c -o example
> ptxas warning : Too big maxrregcount value specified 64, will be ignored
> nvlink error   : Undefined reference to '__kmpc_kernel_init' in
> '/tmp/example-87866c-36d3a6.cubin'
> nvlink error   : Undefined reference to '__kmpc_for_static_init_4' in
> '/tmp/example-87866c-36d3a6.cubin'
> nvlink error   : Undefined reference to '__kmpc_for_static_fini' in
> '/tmp/example-87866c-36d3a6.cubin'
> clang-3.8: error: nvlink command failed with exit code 255 (use -v to see
> invocation)
>
>
> Any pointer, where the problem could be ?
>
> Thanks a lot.
>
>
>
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