--cuda-path is the right flag to pass. Strange it's not doing the right thing for you.
Can you include the output of running the same command line with -v? On Fri, Aug 18, 2017 at 3:55 AM, Jean-Loup Tastet via cfe-users <cfe-users@lists.llvm.org> wrote: > Hi, > > I am trying to use Clang to compile CUDA device code. I followed the > instructions in [1] and compiled the latest Clang trunk [2]. > > However, my system has both CUDA 8.0 and 9.0 RC installed, in > `/usr/local/cuda-{8.0,9.0}`. The default `/usr/local/cuda` is symlinked > to `/usr/local/cuda-8.0`. > > Clang only supports version 8.0, however it seems to incorrectly pick > version 9.0, even when manually specifying the `--cuda-path`. For > instance, trying to compile a trivial CUDA program (with no kernel): > ``` > $ cat main.cu > #include <cuda.h> > #include <iostream> > > int main(int argc, char* argv[]) > { > std::cout << "Hello, World!" << std::endl; > } > > $ clang++ -o main main.cu \ > --cuda-path=/usr/local/cuda-8.0 \ > -I/usr/local/cuda-8.0/include \ > -L/usr/local/cuda-8.0/lib64 \ > -lcudart_static -ldl -lrt -pthread > ``` > generates the following error: > ``` > /home/jtastet/.local/stow/llvm_gcc- > 6.3/lib/clang/6.0.0/include/__clang_cuda_runtime_wrapper.h:66:2: error: > "Unsupported CUDA version!" > #error "Unsupported CUDA version!" > ^ > In file included from <built-in>:1: > In file included from /home/jtastet/.local/stow/llvm_gcc- > 6.3/lib/clang/6.0.0/include/__clang_cuda_runtime_wrapper.h:169: > /usr/local/cuda-9.0/targets/x86_64- > linux/include/device_functions.hpp:218:10: error: reference to > __device__ function '__nvvm_bar0_popc' in __host__ function > return __nvvm_bar0_popc(predicate); > ^ > /usr/local/cuda-9.0/targets/x86_64- > linux/include/device_functions.hpp:218:10: note: '__nvvm_bar0_popc' > declared here > /usr/local/cuda-9.0/targets/x86_64- > linux/include/device_functions.hpp:223:10: error: reference to > __device__ function '__nvvm_bar0_and' in __host__ function > return __nvvm_bar0_and(predicate); > ^ > [...output truncated...] > ``` > Note the reference to CUDA 9.0 in the path. > > Do you know how to tell Clang which version of CUDA to use ? Does it > have to be specified at compile-time or as a command-line option ? > > Uninstalling CUDA 9.0 is not an option here, since I do not have > privileged access to the machine. > > Thanks in advance for your help ! > > Best regards, > Jean-Loup Tastet > > > [1] https://llvm.org/docs/CompileCudaWithLLVM.html > [2] For reference, I compiled revision 311091 with the following > configuration: > ``` > cmake -G "Unix Makefiles" \ > -D CMAKE_INSTALL_PREFIX=/home/jtastet/.local/stow/llvm_gcc-6.3 \ > -D CMAKE_BUILD_TYPE=Release \ > -D GCC_INSTALL_PREFIX=/afs/cern.ch/sw/lcg/external/gcc/6.3/x86_64- > centos7 \ > .. > ``` > _______________________________________________ > cfe-users mailing list > cfe-users@lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users _______________________________________________ cfe-users mailing list cfe-users@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users