[llvm-bugs] [llvm-dev] cannot build CUDA support with llvm-trunk

[Siegmar Gross via llvm-bugs]

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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