if(CMAKE_C_COMPILER_ID STREQUAL Clang)
    set(compiler "${CMAKE_C_COMPILER}")
elseif(CMAKE_CXX_COMPILER_ID STREQUAL Clang)
    set(compiler "${CMAKE_CXX_COMPILER}")
else()
    return()
endif()

foreach(tool ar ranlib ld nm objdump as)
    execute_process(
        COMMAND "${compiler}" -print-prog-name=llvm-${tool}
        OUTPUT_VARIABLE prog_path
        OUTPUT_STRIP_TRAILING_WHITESPACE
    )

    # for FreeBSD
    if(NOT prog_path MATCHES "^/")
        get_filename_component(
            abs_path ${prog_path} ABSOLUTE
            BASE_DIR /usr/local/llvm-devel/bin
        )

        if(EXISTS ${abs_path})
            set(prog_path ${abs_path})
        endif()
    endif()

    if(prog_path MATCHES "^/")
        if(tool STREQUAL ld)
            set(tool linker)
        elseif(tool STREQUAL as)
            set(tool asm_compiler)
        endif()

        string(TOUPPER ${tool} utool)

        set(CMAKE_${utool} "${prog_path}" PARENT_SCOPE)
        set(CMAKE_${utool} "${prog_path}" CACHE FILEPATH "${tool}" FORCE)
    endif()
endforeach()