[cfe-dev] Clang/CUDA: --cuda-path

[Jingyue Wu via cfe-dev]

As mentioned in http://llvm.org/docs/CompileCudaWithLLVM.html, the CUDA
support works the best with the trunk version of LLVM. Can you possibly try
that?

I also don't know how well Clang for CUDA works with CUDA 6.0 SDK. Artem,
can you comment on that?

On Wed, Mar 16, 2016 at 11:43 AM, Huebl, Axel via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> [Migrated from llvm-dev]
>
> Hi,
>
> I installed the latest version of clang 3.8 from the llvm deb packages
> (http://llvm.org/apt/) and have a Debian Jessie with cuda 6.0 from the
> official Debian repos installed and running (under /usr).
>
> When trying to compile a cuda program, the typical cuda extensions and
> APIs such as `__device__` and `cudaMalloc` are now known to clang,
> although I did set --cuda-arch=sm_35 and --cuda-path=/usr
>
>   mandelbrot.cu: error: unknown type name '__device__'
>     __device__ cuComplex( float a, float b ) : r(a), i(b) {}
>
>   mandelbrot.cu: error: unknown type name '__global__'
>     __global__ void calcMandelbrot( int* color_d, const int num_rows,
>     const int num...
>
>   mandelbrot.cu: error: use of undeclared identifier 'cudaMalloc'
>         cudaMalloc( (void**)&color_d, nBytes );
>
>   [...]
>
> I had a similar problem with a development version published in November
> but setting --cuda-path solved it that time (I think the cuda path was
> not in /usr but in a /opt path on our cluster).
>
> Did I miss an option or is the detection in /usr installs failing?
>
> Today's versions:
>
> $ clang++-3.8 --version
> clang version 3.8.0-svn260756-1~exp1 (branches/release_38)
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
> InstalledDir: /usr/bin
>
> $ nvcc --version
> nvcc: NVIDIA (R) Cuda compiler driver
> Copyright (c) 2005-2013 NVIDIA Corporation
> Built on Thu_Mar_13_11:58:58_PDT_2014
> Cuda compilation tools, release 6.0, V6.0.1
>
> $ locate cuda.h
> /usr/include/cuda.h
> $ which nvcc
> /usr/bin/nvcc
> $ which clang++-3.8
> /usr/bin/clang++-3.8
>
> Compile :
>
> $ clang++-3.8 --cuda-gpu-arch=sm_35 mandelbrot.cu -I/usr/include/
> -L/usr/lib/x86_64-linux-gnu/ -lcudart -lcudart_static -ldl -lrt -pthread
> -I/usr/include/x86_64-linux-gnu
> # also tried with -lcuda
>
> File to compile:
>   https://git.io/vazCm
>
>
> Best regards,
> Axel Huebl
> --
>
> Axel Huebl
> Phone +49 351 260 3582
> https://www.hzdr.de/crp
> Computational Radiation Physics
> Laser Particle Acceleration Division
> Helmholtz-Zentrum Dresden - Rossendorf e.V.
>
> Bautzner Landstrasse 400, 01328 Dresden
> POB 510119, D-01314 Dresden
> Vorstand: Prof. Dr.Dr.h.c. R. Sauerbrey
>           Prof. Dr.Dr.h.c. P. Joehnk
> VR 1693 beim Amtsgericht Dresden
>
>
>
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>
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