[llvm-dev] "cannot find libdevice for sm_"

[Alexey.Bataev via llvm-dev]

Hi Jost, most probably the compiler cannot correctly find CUDA
installation or cannot detect its version correctly. Check, if your CUDA
installation directiry has version.txt file.

-------------
Best regards,
Alexey Bataev

24.08.2020 4:58 PM, Jost, Gabriele (ARC-TNC)[Supersmith] via llvm-dev пишет:
>
> Hello,
>
> I have installed clang12 with OpenMP target-offload on a cluster of
> v100 nodes using cuda 10.1 and gcc 8.2.
>
> When I try to test it:
>
> clang  -c -I../common -O3 -g -fopenmp
> -fopenmp-targets=nvptx64-nvida-cuda
> -Xopenmp-target=nvptx64-nvidia-cuda -march=sm_70 -mcmodel=medium
> -DCRPL_COMP=0 ft.c
>
> clang-12: error: cannot find libdevice for sm_
>
>  
>
> with a blank architecture.
>
>  
>
> I have the openmp target bc libraries
>
> lrwxrwxrwx 1 gjost scicon       19 Aug 21 14:39 libRemarks.so ->
> libRemarks.so.12git
>
> -rw-r--r-- 1 gjost scicon    69656 Aug 21 14:52
> libomptarget-nvptx-sm_35.bc
>
> -rw-r--r-- 1 gjost scicon    69196 Aug 21 14:52
> libomptarget-nvptx-sm_70.bc
>
> -rw-r--r-- 1 gjost scicon    69608 Aug 21 14:52
> libomptarget-nvptx-sm_60.bc
>
> lrwxrwxrwx 1 gjost scicon        9 Aug 21 15:07 libgomp.so -> libomp.so
>
> lrwxrwxrwx 1 gjost scicon        9 Aug 21 15:07 libiomp5.so -> libomp.so
>
>  
>
> The only place in the llvm code where I see a message like this is here:
>
>  
>
> grep "cannot find libdevice for sm_"
> *llvm-project/clang/test/Driver/cuda-detect.cu*
>
> // MISSINGLIBDEVICE: error: cannot find libdevice for sm_20.
>
> pfe25.gjost 69> grep MISSINGLIBDEVICE
> llvm-project/clang/test/Driver/cuda-detect.cu
>
> // RUN:   | FileCheck %s -check-prefix COMMON -check-prefix
> MISSINGLIBDEVICE
>
> // RUN:   | FileCheck %s -check-prefix COMMON -check-prefix
> MISSINGLIBDEVICE
>
> // MISSINGLIBDEVICE: error: cannot find libdevice for sm_20.
>
>  
>
>  
>
> Have you seen this behavior before? Maybe clang12/cuda/10.1 and gcc8.2
> is a bad combo?
>
> Thanks in advance and greetings,
>
>  
>
>  
>
> Gabriele Jost
>
>  
>
> ************************************************************************
>
> Gabriele Jost       NASA Ames Research Center
>
> Email: Gabriele.Jost at nasa.gov    Mail Stop 258-6
>
> Work Phone: (650) 604-0468     Bldg. 258, Rm. 232-4
>
> Scientific & HPC Application        P.O. Box 1
>
> Development/Optimization         Moffett Field, CA 94035-0001
>
> ************************************************************************
>
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