GCC+nvcc build failure with -mno-float128

[mlohry]

The template project fails to build on a basic ubuntu 20.04 system with nvcc 11.3 and gcc 9.3.0:

cmake ../ -DENABLE_CUDA=On -DCMAKE_CUDA_COMPILER=/usr/local/cuda/bin/nvcc

and make results in:

c++: error: unrecognized command line option ‘-mno-float128’

It seems that -mno-float128 flag is clang only?

The offending CMake entry is in RAJA/CMakeLists.txt:90:

  if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
            if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 8.0)
              set (CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -Xcompiler -mno-float128")
            endif ()
endif()

[rhornung67]

@mlohry unfortunately this project has been dormant for a while. We'll dig into this and update it after we get the next RAJA release out. We're shooting for mid-June.

[mlohry]

@rhornung67 okay, no problem. I came here from the RAJA main page "We also maintain a RAJA Template Project that shows how to use RAJA in a CMake project, either as a Git submodule or as an installed library".