[CMake] CMake tried to pass all flags from gcc into nvcc when trying to add CUDA extension to current CPP project

Robert Maynard robert.maynard at kitware.com
Mon Jul 9 11:54:29 EDT 2018 

The `CUDA_PROPAGATE_HOST_FLAGS` and `CUDA_SEPARABLE_COMPILATION` are global
variables ( use `set` ) not a target properties. You can find more
documentation on the legacy cuda support variable in the find cuda module (
https://cmake.org/cmake/help/latest/module/FindCUDA.html ).

On Mon, Jul 9, 2018 at 9:52 AM Quang Ha <quang.t.ha.20 at gmail.com> wrote:

> Hi all,
>
> The situation I am currently in is as followed. This is the directory for
> my project:
>
> project
> |----------CMakeLists.txt
> |----------app
> |            |--------CMakeLists.txt
> |            |--------test_cuda
> |                          |--------CMakeLists.txt
> |                          |--------test_cuda.cu
> |----------src
> |----------test
> |----------doc
>
> Inside project/app/CMakeLists.txt, it looks like this:
> ##
> add_subdirectory(test_cuda)
> ##
> and then inside project/app/test_cuda/CMakeLists.txt, it is:
> ##
> find_package(CUDA REQUIRED)
>
> if (CUDA_FOUND)
>     # CUDA falgs
>     include_directories(${CUDA_INCLUDE_DIRS})
>     set(ALL_CUDA_LIBS ${CUDA_LIBRARIES} ${CUDA_cusparse_LIBRARY}
> ${CUDA_cublas_LIBRARY})
>     set(LIBS ${LIBS} ${ALL_CUDA_LIBS})
>     set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS};--maxrregcount 32)
>     # set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS};-gencode
> arch=compute_70,code=sm_70)
>
>     # Link to executable
>     cuda_add_executable(test_cuda test_cuda.cu)
>     # set_target_properties(test_cuda PROPERTIES COMPILE_FLAGS
> "-DTHRUST_DEVICE_SYSTEM=THRUST_DEVICE_SYSTEM_CUDA")
>     set_target_properties(test_cuda PROPERTIES CUDA_SEPARABLE_COMPILATION
> ON)
>     set_target_properties(test_cuda PROPERTIES CUDA_PROPAGATE_HOST_FLAGS
> OFF)
>     target_link_libraries(test_cuda ${LIBS} ${EXTRA_LIBS})
> endif()
> ##
>
> There is nothing special inside test_cuda.cu - since I just want to test
> cmake integration:
> ##
> #include <stdio.h>
> #include <fstream>
>
> __global__
> void kernel (void){
> }
>
> int main(void ) {
>   kernel<<<1,1>>>();
>   return 0;
> }
> ##
>
> I got an error when running cmake with this:
>
> ###
> [ 75%] Building NVCC (Device) object
> app/test_cuda/CMakeFiles/test_cuda.dir/test_cuda_generated_test_cuda.cu.o
> /projects/opt/centos7/gcc/6.4.0/include/c++/6.4.0/bits/stl_algobase.h(200):
> error: statement may not appear in a constexpr function
>
> /projects/opt/centos7/gcc/6.4.0/include/c++/6.4.0/bits/stl_algobase.h(202):
> error: a constexpr function must contain exactly one return statement
>
> /projects/opt/centos7/gcc/6.4.0/include/c++/6.4.0/bits/stl_algobase.h(224):
> error: statement may not appear in a constexpr function
>
> /projects/opt/centos7/gcc/6.4.0/include/c++/6.4.0/bits/stl_algobase.h(226):
> error: a constexpr function must contain exactly one return statement
>
> /projects/opt/centos7/gcc/6.4.0/include/c++/6.4.0/bits/stl_algobase.h(246):
> error: statement may not appear in a constexpr function
>
> /projects/opt/centos7/gcc/6.4.0/include/c++/6.4.0/bits/stl_algobase.h(248):
> error: a constexpr function must contain exactly one return statement
>
> /projects/opt/centos7/gcc/6.4.0/include/c++/6.4.0/bits/stl_algobase.h(268):
> error: statement may not appear in a constexpr function
>
> /projects/opt/centos7/gcc/6.4.0/include/c++/6.4.0/bits/stl_algobase.h(270):
> error: a constexpr function must contain exactly one return statement
>
> 8 errors detected in the compilation of
> "/tmp/tmpxft_00003241_00000000-4_test_cuda.cpp4.ii".
> CMake Error at test_cuda_generated_test_cuda.cu.o.Release.cmake:279
> (message):
>   Error generating file
>
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//./test_cuda_generated_test_cuda.cu.o
> ###
>
> Checking with make VERBOSE=1:
>
> ##
> [ 75%] Building NVCC (Device) object
> app/test_cuda/CMakeFiles/test_cuda.dir/test_cuda_generated_test_cuda.cu.o
> cd
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir &&
> /projects/opt/centos7/cmake/3.11.1/bin/cmake -E make_directory
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//.
> cd
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir &&
> /projects/opt/centos7/cmake/3.11.1/bin/cmake -D verbose:BOOL=1 -D
> build_configuration:STRING=Release -D
> generated_file:STRING=/home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//./test_cuda_generated_test_cuda.cu.o
> -D
> generated_cubin_file:STRING=/home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//./test_cuda_generated_test_cuda.cu.o.cubin.txt
> -P
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.Release.cmake
> -- Removing
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//./test_cuda_generated_test_cuda.cu.o
> /projects/opt/centos7/cmake/3.11.1/bin/cmake -E remove
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//./test_cuda_generated_test_cuda.cu.o
> -- Generating dependency file:
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.NVCC-depend
> /projects/opt/centos7/cuda/9.1/bin/nvcc -M -D__CUDACC__
> /home/qth20/develop/project/app/test_cuda/test_cuda.cu -o
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.NVCC-depend
> -ccbin /projects/opt/centos7/gcc/6.4.0/bin/gcc -m64 -DTHRUST
> -DTHRUST_HOST_SYSTEM=THRUST_HOST_SYSTEM_CPP
> -DTHRUST_DEVICE_SYSTEM=THRUST_DEVICE_SYSTEM_CUDA
> "-DCUDA_CALLABLE=\"__host__ __device__\"" -Xcompiler
> ,\"-std=c++14\",\"-O3\",\"-DNDEBUG\" --std=c++11 --expt-relaxed-constexpr
> -Xcompiler -fPIC --maxrregcount 32 -DNVCC
> -I/projects/opt/centos7/cuda/9.1/include -I/home/qth20/develop/project
> -I/home/qth20/develop/project/build
> -I/home/qth20/develop/project/cinch/logging
> -I/projects/opt/centos7/openmpi/3.1.0-gcc_8.1.0/include    /UnitTest++
> -- Generating temporary cmake readable file:
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.depend.tmp
> /projects/opt/centos7/cmake/3.11.1/bin/cmake -D
> input_file:FILEPATH=/home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.NVCC-depend
> -D
> output_file:FILEPATH=/home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.depend.tmp
> -D verbose=1 -P
> /projects/opt/centos7/cmake/3.11.1/share/cmake-3.11/Modules/FindCUDA/make2cmake.cmake
> -- Copy if different
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.depend.tmp
> to
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.depend
> /projects/opt/centos7/cmake/3.11.1/bin/cmake -E copy_if_different
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.depend.tmp
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.depend
> -- Removing
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.depend.tmp
> and
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.NVCC-depend
> /projects/opt/centos7/cmake/3.11.1/bin/cmake -E remove
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.depend.tmp
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//test_cuda_generated_test_cuda.cu.o.NVCC-depend
> -- Generating
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//./test_cuda_generated_test_cuda.cu.o
> /projects/opt/centos7/cuda/9.1/bin/nvcc
> /home/qth20/develop/project/app/test_cuda/test_cuda.cu -c -o
> /home/qth20/develop/project/build/app/test_cuda/CMakeFiles/test_cuda.dir//./test_cuda_generated_test_cuda.cu.o
> -ccbin /projects/opt/centos7/gcc/6.4.0/bin/gcc -m64 -DTHRUST
> -DTHRUST_HOST_SYSTEM=THRUST_HOST_SYSTEM_CPP
> -DTHRUST_DEVICE_SYSTEM=THRUST_DEVICE_SYSTEM_CUDA
> "-DCUDA_CALLABLE=\"__host__ __device__\"" -Xcompiler
> ,\"-std=c++14\",\"-O3\",\"-DNDEBUG\" --std=c++11 --expt-relaxed-constexpr
> -Xcompiler -fPIC --maxrregcount 32 -DNVCC
> -I/projects/opt/centos7/cuda/9.1/include -I/home/qth20/develop/project
> -I/home/qth20/develop/project/build
> -I/home/qth20/develop/project/cinch/logging
> -I/projects/opt/centos7/openmpi/3.1.0-gcc_8.1.0/include    /UnitTest++
> [Error]
> ##
>
> It looks like all the flags used in gcc is passed directly into nvcc. Is
> there a way to turn this off?
>
> Thanks,
> Quang
> --
>
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