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

Huebl, Axel via cfe-dev cfe-dev at lists.llvm.org
Wed Mar 16 03:43:13 PDT 2016

[Migrated from llvm-dev]


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
$ which nvcc
$ which 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
# also tried with -lcuda

File to compile:

Best regards,
Axel Huebl

Axel Huebl
Phone +49 351 260 3582
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

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 5119 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20160316/1ee32dcb/attachment.bin>

More information about the cfe-dev mailing list