[CMake] isystem include of system library header with CUDA

[Osuna Escamilla Carlos]

Hi everybody

with cmake I have always used the SYSTEM keyword for the include_directories to include system libraries:

include_directories( SYSTEM ${Boost_INCLUDE_DIRS} )

in order to pass system include directories with compiler with -isystem.
The problem I have is that this does not seem to work with CUDA.

In FindCUDA.cmake, it seems that -I is hardcoded

  if(CUDA_NVCC_INCLUDE_DIRECTORIES)
    foreach(dir ${CUDA_NVCC_INCLUDE_DIRECTORIES})
      list(APPEND CUDA_NVCC_INCLUDE_ARGS -I${dir})
    endforeach()
  endif()

So the question is am I right? Or am I assuming something wrong?
If yes, it would be extremely useful if we could use the same mechanism to pass -isystem to nvcc, to avoid all the warnings from system libraries.

Thanks, Carlos
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