[llvm-dev] cannot build CUDA support with llvm-trunk (original) (raw)

Siegmar Gross via llvm-dev llvm-dev at lists.llvm.org
Fri Aug 4 16:45:35 PDT 2017

Hi Pierre,

Are you sure it won't build with CUDA support? The logs you linked only say it does not use some of the variables you defined, not that it failed to configure the project or build it. It could be due to CMake (since 3.8) supporting CUDA as a primary language and no longer needing to use find_package(CUDA). The includes and path to the libraries should be automatically added, so they no longer use those variables you were setting manually.

You are right, it still detects CUDA, but doesn't build libomptarget which was built before.

loki introduction 109 clang -v clang version 6.0.0 (trunk 310065) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/llvm-trunk/bin Found candidate GCC installation: /usr/lib64/gcc/x86_64-suse-linux/4.8 Selected GCC installation: /usr/lib64/gcc/x86_64-suse-linux/4.8 Candidate multilib: .;@m64 Candidate multilib: 32;@m32 Selected multilib: .;@m64 Found CUDA installation: /usr/local/cuda, version 8.0

loki introduction 110 clang -fopenmp -fopenmp-targets=x86_64-unknown-linux-gnu dot_prod_accelerator_OpenMP.c -lomptarget -lm /usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../x86_64-suse-linux/bin/ld: cannot find -lomptarget clang-6.0: error: linker command failed with exit code 1 (use -v to see invocation) loki introduction 111

I checked out the following projects.

svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm cd llvm/tools svn co http://llvm.org/svn/llvm-project/cfe/trunk clang svn co http://llvm.org/svn/llvm-project/polly/trunk polly cd clang/tools svn co http://llvm.org/svn/llvm-project/clang-tools-extra/trunk/ extra cd ../../../projects svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt svn co http://llvm.org/svn/llvm-project/openmp/trunk openmp svn co https://github.com/clang-ykt/openmp libomptarget cd ../..

Do you or any other person have an idea why libomptarget will not be built? Thank you very much for any help in advance.

Kind regards

Siegmar

I don't have a computer at hand to check that this is indeed the issue, though.

See https://cmake.org/cmake/help/v3.8/release/3.8.html#cuda and https://cmake.org/cmake/help/v3.8/search.html?q=CUDA&check_keywords=yes&area=default for more details about the new support.

Pierre

On 4 Aug 2017, at 13:11, Siegmar Gross via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:

Hi,

I try to build the latest version of llvm-trunk with Cmake (gcc-5.3.0 is necessary for CUDA) on my "SUSE Linux Enterprise Server 12.2 (x86_64)". Unfortunately, "libomptarget" for CUDA will not be built with that version. I use the same configuration command as before.

cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr/local/${LLVM_VERSION}
-DCMAKE_BUILD_TYPE:STRING="Release"
-DLLVM_PARALLEL_COMPILE_JOBS:STRING="4"
-DLLVM_PARALLEL_LINK_JOBS:STRING="4"
-DCMAKE_C_COMPILER:STRING="${DIRPREFIX_PROG}/${GCCDIR}/bin/gcc"
-DCMAKE_C_FLAGS:STRING="-m64 -I/usr/local/valgrind/include"
-DCMAKE_CXX_COMPILER:STRING="${DIRPREFIX_PROG}/${GCCDIR}/bin/g++"
-DCMAKE_CXX_FLAGS:STRING="-m64 -I/usr/local/valgrind/include"
-DCMAKE_EXE_LINKER_FLAGS:STRING="-m64"
-DLLVM_LIBDIR_SUFFIX:STRING="64"
-DLLVM_POLLY_LINK_INTO_TOOLS:BOOL=ON
-DLIBOMPTARGET_DEP_LIBELF_INCLUDE_DIR:STRING="/usr/local/elfutils-0.169/include"
-DLIBOMPTARGET_DEP_LIBELF_LIBRARIES:STRING="/usr/local/elfutils-0.169/lib64/libelf.so"
-DLIBOMPTARGET_DEP_LIBFFI_INCLUDE_DIR:STRING="/usr/include"
-DLIBOMPTARGET_DEP_LIBFFI_LIBRARIES:STRING="/usr/lib64/libffi.so"
-DCUDA_INCLUDE_DIRS:STRING="/usr/local/cuda/include"
-DCUDA_LIBRARIES:STRING="/usr/local/cuda/lib64/libcudart.so"
-DBUILD_SHARED_LIBS:BOOL=ON
../llvm
|& tee log.cmake

Now I get the following output.

loki build 613 tail -13 log.cmake -- Generating done CMake Warning: Manually-specified variables were not used by the project:

CUDA_INCLUDE_DIRS CUDA_LIBRARIES LIBOMPTARGET_DEP_LIBELF_INCLUDE_DIR LIBOMPTARGET_DEP_LIBELF_LIBRARIES LIBOMPTARGET_DEP_LIBFFI_INCLUDE_DIR LIBOMPTARGET_DEP_LIBFFI_LIBRARIES

-- Build files have been written to: /export2/src/llvm-trunk/build loki build 614

Do you have any ideas why I cannot build CUDA support any longer? Is it necessary to change my configuration command to build CUDA support? Thank you very much for any help in advance.

Kind regards

Siegmar

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