c++cmakecudabuildconfiguration

How do I override the (host-side) C++ compiler CMake uses for CUDA targets?

I'm using a CUDA version which does not support the GCC version installed on my system (my GCC is too new). I'm trying to build a repository which uses CMake for build configuration.

I know how to override the C++ compiler, traditionally:

export CXX=/path/to/other/compiler-binary

and CMake picks this up. I can also use cmake -DCMAKE_CXX_COMPILER. However, neither of these options work when compiling CUDA host-side code: CMake still has CUDA try to use my default GCC version on my system.

How can I tell it to use the alternative C++ compiler for CUDA?

Additional info:

Solution

  • use CMAKE_CUDA_HOST_COMPILER:

    CMake will not (for now) default to using your CMAKE_CXX_COMPILER as the C++ compiler for CUDA host-side code; there's a different setting for that. Run your build configuration like so:

    cmake -DCMAKE_CUDA_HOST_COMPILER=/usr/bin/g++-9

    (replace the path with to your chosen C++ compiler of course)