[CMake] CMake for CUDA with MPICC still using gcc to link?

Tue Jul 31 15:31:00 EDT 2018

Thanks Robert - specific at the cmake -D [...] command seemsd to work. Is
it possible to set this inside a CMakeLists.txt? I have tried:

set(CUDA_HOST_COMPILER ${CMAKE_CXX_COMPILER})
set(CUDA_LINKER_PREFERENCE ${CMAKE_CXX_COMPILER})

but it snaps back to gcc still.

Thanks,
QT

On Tue, 31 Jul 2018 at 13:12, Robert Maynard <robert.maynard at kitware.com>
wrote:

> It is snapping back to g++ as that was the linker that nvcc uses when
> it builds an executable. CMake detects this as part of the compiler
> detection process.
>
> I haven't verified that this will work but you can try specifying the
> LINKER_LANGUAGE(
> https://cmake.org/cmake/help/v3.12/prop_tgt/LINKER_LANGUAGE.html)
> of the executable to be 'CXX'. You might also explore specifying
> 'CMAKE_CUDA_HOST_COMPILER' as part of your initial cmake configuration
> options to be the same as your c++ compiler ( you will need a clean
> build directory for this to work).
> On Tue, Jul 31, 2018 at 1:43 PM Quang Ha <quang.t.ha.20 at gmail.com> wrote:
> >
> > Hi all,
> >
> > Currently using cmake/3.11.1, I want to try and compile MPI/CUDA
> application with cmake. I kept running into problems of 'undefined
> MPI_Init', so I take a look at `make VERBOSE=1`. The output looks something
> like this
> >
> >
> ===============================================================================
> > /projects/opt/centos7/cmake/3.11.1/bin/cmake -E cmake_link_script
> CMakeFiles/tangram.dir/link.txt --verbose=1
> > /projects/opt/centos7/openmpi/2.1.2-gcc_6.4.0/bin/mpicc -fPIC -fopenmp
> -O3 -DNDEBUG  -shared -Wl,-soname,libtangram.so -o libtangram.so
> CMakeFiles/tangram.dir/tangram/intersect/r3d.c.o
> > make[2]: Leaving directory `/home/qth20/develop/tangram/build'
> > [ 40%] Built target tangram
> > make -f app/vfgen-cuda/CMakeFiles/vfgen-cuda.dir/build.make
> app/vfgen-cuda/CMakeFiles/vfgen-cuda.dir/depend
> > make[2]: Entering directory `/home/qth20/develop/tangram/build'
> > cd /home/qth20/develop/tangram/build &&
> /projects/opt/centos7/cmake/3.11.1/bin/cmake -E cmake_depends "Unix
> Makefiles" /home/qth20/develop/tangram
> /home/qth20/develop/tangram/app/vfgen-cuda
> /home/qth20/develop/tangram/build
> /home/qth20/develop/tangram/build/app/vfgen-cud$
> >
> /home/qth20/develop/tangram/build/app/vfgen-cuda/CMakeFiles/vfgen-cuda.dir/DependInfo.cmake
> --color=
> > make[2]: Leaving directory `/home/qth20/develop/tangram/build'
> > make -f app/vfgen-cuda/CMakeFiles/vfgen-cuda.dir/build.make
> app/vfgen-cuda/CMakeFiles/vfgen-cuda.dir/build
> > make[2]: Entering directory `/home/qth20/develop/tangram/build'
> > [ 60%] Building CUDA object
> app/vfgen-cuda/CMakeFiles/vfgen-cuda.dir/vfgen-cuda.cu.o
> > cd /home/qth20/develop/tangram/build/app/vfgen-cuda &&
> /projects/opt/centos7/cuda/9.0/bin/nvcc  -DCUDA_CALLABLE="\"__host__
> __device__\"" -DENABLE_MPI -DHAVE_LAPACKE -DMPICH_SKIP_MPICXX
> -DOMPI_SKIP_MPICXX -DTHRUST
> -DTHRUST_DEVICE_SYSTEM=THRUST_DEVICE_SYSTEM_CUDA -DTHRUST$
> > HOST_SYSTEM=THRUST_HOST_SYSTEM_CPP -I/home/qth20/develop/tangram
> -I/home/qth20/develop/tangram/build
> -I/home/qth20/develop/tangram/cinch/logging
> -I/home/qth20/installed/jali-gcc_6.4.0-openmpi-2.1.2/include
> -I/home/qth20/installed/jali-tpls-gcc_6.4.0-openmpi-2.1.2/include
> >
> -I/home/qth20/installed/jali-tpls-gcc_6.4.0-openmpi-2.1.2/trilinos-12-10-1/include
> -I/projects/opt/centos7/openmpi/2.1.2-gcc_6.4.0/include
> -I/home/qth20/installed/jali-tpls-gcc_6.4.0-openmpi-2.1.2/trilinos-12-10-1/lib/cmake/Zoltan/../../../include
> -I/home/qth20/installed$
> > jali-tpls-gcc_6.4.0-openmpi-2.1.2/include/UnitTest++
> -I/usr/include/lapacke
> -I/home/qth20/installed/xmof2d-gcc_6.4.0-openmpi_2.1.2/include
> -I/projects/opt/centos7/cuda/9.0/include  --expt-relaxed-constexpr
> --std=c++11 -Xcompiler -fPIC -lmpi  -O3 -DNDEBUG   -x cu -c /home$
> > qth20/develop/tangram/app/vfgen-cuda/vfgen-cuda.cu -o
> CMakeFiles/vfgen-cuda.dir/vfgen-cuda.cu.o
> >
> /home/qth20/develop/tangram/tangram/wrappers/mesh/AuxMeshTopology.h(1708):
> warning: variable "nnodes" was declared but never referenced
> >
> >
> /home/qth20/develop/tangram/tangram/wrappers/mesh/AuxMeshTopology.h(1993):
> warning: variable "ncells" was declared but never referenced
> >
> >
> /home/qth20/develop/tangram/tangram/wrappers/mesh/AuxMeshTopology.h(2070):
> warning: variable "ibndry" was declared but never referenced
> >
> > [ 80%] Linking CUDA device code
> CMakeFiles/vfgen-cuda.dir/cmake_device_link.o
> > cd /home/qth20/develop/tangram/build/app/vfgen-cuda &&
> /projects/opt/centos7/cmake/3.11.1/bin/cmake -E cmake_link_script
> CMakeFiles/vfgen-cuda.dir/dlink.txt --verbose=1
> > /projects/opt/centos7/cuda/9.0/bin/nvcc  --expt-relaxed-constexpr
> --std=c++11 -Xcompiler -fPIC -lmpi  -O3 -DNDEBUG  -Xcompiler=-fPIC
> -Wno-deprecated-gpu-targets -shared -dlink
> CMakeFiles/vfgen-cuda.dir/vfgen-cuda.cu.o -o
> CMakeFiles/vfgen-cuda.dir/cmake_device_link.o
> > [100%] Linking CUDA executable vfgen-cuda
> > cd /home/qth20/develop/tangram/build/app/vfgen-cuda &&
> /projects/opt/centos7/cmake/3.11.1/bin/cmake -E cmake_link_script
> CMakeFiles/vfgen-cuda.dir/link.txt --verbose=1
> > /projects/opt/centos7/gcc/6.4.0/bin/g++
>  CMakeFiles/vfgen-cuda.dir/vfgen-cuda.cu.o
> CMakeFiles/vfgen-cuda.dir/cmake_device_link.o -o vfgen-cuda
> /projects/opt/centos7/cuda/9.0/lib64/libcudart_static.a -ldl
> /usr/lib64/librt.so  -L"/projects/opt/centos7/cuda/9.0/lib64/stubs"
> >  -L"/projects/opt/centos7/cuda/9.0/lib64" -lcudadevrt -lcudart_static
> -lrt -lpthread -ldl
> >
> ===============================================================================
> >
> > so apparently, mpicc is used other parts of the project, but when
> linking extension between object codes it snaps back to g++(!). I have
> already specified CMAKE_C_COMPILER and CMAKE_CXX_COMPILER to be mpicc and
> mpic++, respectively. Inside the CMakeLists for this CUDA:
> >
> >
> ===============================================================================
> > project(tangram LANGUAGES CXX CUDA)
> > [...]
> > if (CUDA_FOUND)
> >    string(APPEND CMAKE_CUDA_FLAGS "--expt-relaxed-constexpr --std=c++11
> ")
> >    # Other CUDA flags
> > endif(CUDA_FOUND)
> >
> > [... Inside CUDA app directory...]
> > add_executable(vfgen-cuda vfgen-cuda.cu)
> > target_link_libraries(vfgen-cuda ${EXTRA_LIBS} ${MPI_LIBRARIES})
> >
> ===============================================================================
> >
> > Is something missed out?
> >
> > Thanks,
> > Quang
> > --
> >
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