IF(APPLE)
    SET(HGL_BITS 64)
ELSE()
    IF(ANDROID)
        if(ANDROID_ABI MATCHES ".*64.*")
            SET(HGL_BITS 64)
        else()
            SET(HGL_BITS 32)
        endif()
    ELSE()
        IF(CMAKE_SIZEOF_VOID_P EQUAL 8)
            SET(HGL_BITS 64)
        ELSE()
            SET(HGL_BITS 32)
        ENDIF()
    endif()
endif()

IF(HGL_BITS EQUAL 32)
    add_definitions(-DHGL_32_BITS)
    add_definitions(-DHGL_POINTER_UINT=uint32)
ELSE()
    add_definitions(-DHGL_64_BITS)
    add_definitions(-DHGL_POINTER_UINT=uint64)
ENDIF()

Message("System is ${HGL_BITS} Bit")