Linking cufft_static with a CXX target

[robert.maynard (rob.maynard)]

@pauleonix

Turned on CUDA_SEPARABLE_COMPILATION. This still doesn’t work as CMake invokes g++ for linking instead of nvcc. I would have thought that setting the LINKER_LANGUAGE property to CUDA would fix this, but it does not. Is that a bug or am I missing something?

CUDA_SEPARABLE_COMPILATION is needed when you are compiling code itself that requires separate compilation. In your case you just need the device linking step to occur, and so enabling the CUDA_RESOLVE_DEVICE_SYMBOLS will be sufficient ( works locally with a c++ source file ).

@pauleonix

so I modified the CMakeLists.txt accordingly to link against CMAKE_DL_LIBS and pthreads (Threads::Threads)

When building locally I modified the target_link_libraries call to look like:

target_link_libraries(1d_c2c PRIVATE
  PRIVATE
    CUDA::cufft_static
    CUDA::cudart_static
    CUDA::culibos
    )

That correctly compiles and links. Since the example uses methods like cudaMallocAsync we do need to link to the cuda runtime ( CUDA::cudart_static ).

But you have identified an issue with CUDA::cudfft where it isn’t expressing the proper link requirements on pthreads and dl which I will fix.