[CMake] CMAKE doesn't pass NVCC flags?

[Quang Ha]

I see - thanks! This is working now for 3.11 with CMAKE_CUDA_FLAGS.

On Tue, 24 Jul 2018 at 15:55, Stephen McDowell <sjm324 at cornell.edu> wrote:

> I think you are mixing old and new approaches. Since you have enabled the
> CUDA language (via your project(...) call), you should be using either
> CUDAFLAGS or CMAKE_CUDA_FLAGS.
>
> I think CUDA_NVCC_FLAGS is only used for the old cuda_add_library or
> executable functions.
>
> Note that finding the cuda package should no longer be necessary. If you
> support non-CUDA builds you should use CheckLanguage and
> enable_language(CUDA), and remove CUDA from the project(...) call.
> Currently if nvcc is not found, configuration will fail because you have
> CUDA in the project command which makes it required.
>
> Hope that helps!
>
> -Stephen
>
> On Tue, Jul 24, 2018, 1:48 PM Quang Ha <quang.t.ha.20 at gmail.com> wrote:
>
>> So, it doesn't seem that my setting in NVCC flags is being used:
>>
>> In CMakeLists.txt:
>>
>> project(tangram LANGUAGES CXX CUDA)
>> [...]
>>
>>     FIND_PACKAGE(CUDA REQUIRED)
>>     if(CUDA_FOUND)
>>       add_definitions(-DCUDA_CALLABLE="__host__ __device__")
>>       set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS};-Xcompiler="-fopenmp -fPIC")
>>       set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS};--std=c++11
>> --expt-relaxed-constexpr)
>>       set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS};-gencode
>> arch=compute_70,code=sm_70)
>>       set(CUDA_PROPAGATE_HOST_FLAGS ON)
>>       set(CUDA_SEPARABLE_COMPILATION OFF)
>>       message(STATUS "CUDA include directories ${CUDA_INCLUDE_DIRS}")
>>       message(STATUS "Overwriting THRUST_DIR to point to
>> ${CUDA_INCLUDE_DIRS}/thrust")
>>       set(THRUST_DIR "${CUDA_INCLUDE_DIRS}")
>>       set(EXTRA_LIBS ${CUDA_LIBRARIES})
>>       message("CUDA flags" ${CUDA_NVCC_FLAGS})
>>     else(CUDA_FOUND)
>>       message(FATAL "CUDA not found")
>>     endif(CUDA_FOUND)
>> [...]
>>
>> Then, at cmake stage:
>> [...]
>> -- Overwriting THRUST_DIR to point to
>> /projects/opt/centos7/cuda/9.0/include/thrust
>> CUDA flags-Xcompiler="-fopenmp
>> -fPIC"--std=c++11--expt-relaxed-constexpr-gencodearch=compute_70,code=sm_70
>> -- Adding application directory app
>> [...]
>>
>> But then, build fail, and when I do make VERBOSE=1:
>> [...]
>> [ 60%] Building CUDA object
>> app/simple-vfgen-cuda/CMakeFiles/simple-vfgen-cuda.dir/simple-vfgen-cuda.cu.o
>> cd /home/qth20/develop/tangram/build/app/simple-vfgen-cuda &&
>> /projects/opt/centos7/cuda/9.0/bin/nvcc  -DCUDA_CALLABLE="\"__host__
>> __device__\"" -DHAVE_LAPACKE -DTHRUST
>> -DTHRUST_DEVICE_SYSTEM=THRUST_DEVICE_SYSTEM_CUDA
>> -DTHRUST_HOST_SYSTEM=THRUST_HOST_SYSTEM_OMP -I/home/qth20/develop/tangram
>> -I/home/qth20/develop/tangram/build
>> -I/home/qth20/develop/tangram/cinch/logging
>> -I/home/qth20/installed/jali/include
>> -I/home/qth20/installed/jali-tpls/include
>> -I/home/qth20/installed/jali-tpls/trilinos-12-10-1/include
>> -I/projects/opt/centos7/openmpi/3.1.0-gcc_8.1.0/include
>> -I/home/qth20/installed/jali-tpls/trilinos-12-10-1/lib/cmake/Zoltan/../../../include
>> -I/home/qth20/installed/jali-tpls/include/UnitTest++ -I/usr/include/lapacke
>> -I/home/qth20/installed/xmof2d/include
>> -I/projects/opt/centos7/cuda/9.0/include  -O3 -DNDEBUG   -std=c++11 -x cu
>> -c /home/qth20/develop/tangram/app/simple-vfgen-cuda/simple-vfgen-cuda.cu
>> -o CMakeFiles/simple-vfgen-cuda.dir/simple-vfgen-cuda.cu.o
>> [...]
>>
>> None of the flags was passed into nvcc. This is with cmake/3.11.1. Does
>> upgrading to 3.12 recommended to solve the issue?
>>
>> Thanks,
>> Quang
>> --
>>
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