register_flag_optional(CMAKE_CXX_COMPILER
        "Any CXX compiler that is supported by CMake detection"
        "c++")

register_flag_optional(USE_VECTOR
        "Whether to use std::vector<T> for storage or use aligned_alloc. C++ vectors are *zero* initialised where as aligned_alloc is uninitialised before first use."
        "OFF")

register_flag_optional(NVHPC_OFFLOAD
        "Enable offloading support (via the non-standard `-stdpar`) for the new NVHPC SDK.
         The values are Nvidia architectures in ccXY format will be passed in via `-gpu=` (e.g `cc70`)

         Possible values are:
           cc35  - Compile for compute capability 3.5
           cc50  - Compile for compute capability 5.0
           cc60  - Compile for compute capability 6.0
           cc62  - Compile for compute capability 6.2
           cc70  - Compile for compute capability 7.0
           cc72  - Compile for compute capability 7.2
           cc75  - Compile for compute capability 7.5
           cc80  - Compile for compute capability 8.0
           ccall - Compile for all supported compute capabilities"
        "")

register_flag_optional(USE_TBB
        "Link against an in-tree oneTBB via FetchContent_Declare, see top level CMakeLists.txt for details."
        "OFF")


macro(setup)
    set(CMAKE_CXX_STANDARD 17)

    if (NVHPC_OFFLOAD)
        set(NVHPC_FLAGS -stdpar -gpu=${NVHPC_OFFLOAD})
        # propagate flags to linker so that it links with the gpu stuff as well
        register_append_cxx_flags(ANY ${NVHPC_FLAGS})
        register_append_link_flags(${NVHPC_FLAGS})
    endif ()
    if(USE_VECTOR)
        register_definitions(USE_VECTOR)
    endif()
    if (USE_TBB)
        register_link_library(TBB::tbb)
    endif ()
endmacro()