[llvm-dev] CUDA compilation "No available targets are compatible with this triple." problem

[Xipeng Shen via llvm-dev]

That was indeed the reason for the issue. The document of LLVM says that the default setting is all targets, which seems not true. I rebuilt LLVM with


cmake ~/clang-llvm/llvm -DCMAKE_BUILD_TYPE=Release -G Ninja -DLLVM_TARGETS_TO_BUILD="X86;NVPTX"

The problem was then gone.
Thanks!

________________________________
From: Pierre Moreau <pierre.morrow at free.fr>
Sent: Wednesday, August 2, 2017 6:45 PM
To: Xipeng Shen
Cc: llvm-dev at lists.llvm.org
Subject: Re: [llvm-dev] CUDA compilation "No available targets are compatible with this triple." problem

If I am not mistaken, clang will compile CUDA code to PTX (which is then fed to ptxas), so I would assume you need to have the NVPTX target enabled, which does not seem to be the case for you.

Pierre

On 2 Aug 2017, at 13:12, Xipeng Shen via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:


Yes, I followed the guide. The same error showed up:


>clang++ axpy.cu -o axpy --cuda-gpu-arch=sm_35 -L/usr/local/cuda/lib64 -I/usr/local/cuda/include -lcudart_static -ldl -lrt -pthread

error: unable to create target: 'No available targets are compatible with this triple.'


________________________________
From: Kevin Choi <code.kchoi at gmail.com<mailto:code.kchoi at gmail.com>>
Sent: Wednesday, August 2, 2017 3:44 PM
To: Xipeng Shen
Cc: llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] CUDA compilation "No available targets are compatible with this triple." problem

I'm assuming you are following guide at https://llvm.org/docs/CompileCudaWithLLVM.html#compiling-cuda-code
Compiling CUDA with clang — LLVM 6 documentation<https://llvm.org/docs/CompileCudaWithLLVM.html#compiling-cuda-code>
llvm.org<http://llvm.org>
Prerequisites ¶ CUDA is supported in llvm 3.9, but it’s still in active development, so we recommend you compile clang/LLVM from HEAD. Before you build CUDA code ...



Have you tried -L and -l flags?

Kevin

On Wed, Aug 2, 2017 at 2:23 PM, Xipeng Shen via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:

Hi,


I have trouble compiling CUDA code with Clang. The following is a command I tried:


> clang++ axpy.cu<http://axpy.cu> -o axpy --cuda-gpu-arch=sm_35 --cuda-path=/usr/local/cuda


The error message is


error: unable to create target: 'No available targets are compatible with this triple.'


The info of the LLVM I'm using is as follows:

> lang++ --version

clang version 6.0.0 (http://llvm.org/git/clang.git 16a0981eccf1bfcc9ba928747aa825e8948791cd) (http://llvm.org/git/llvm.git 052dd78cb30f77a05dc8bb06b851402c4b6c6587)

Target: x86_64-unknown-linux-gnu

Thread model: posix

InstalledDir: /home/xshen5/llvm/bin


  Registered Targets:

    x86    - 32-bit X86: Pentium-Pro and above

    x86-64 - 64-bit X86: EM64T and AMD64


Any help I could get? Thanks!


-Xin

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