cmake HAVE_WNO_UNUSED_CMD_LINE_ARG examples

gnuradio/gnuradio CMakeLists.txt :381 

check_cxx_compiler_flag(-Wno-unused-command-line-argument
                            HAVE_WNO_UNUSED_CMD_LINE_ARG)

gnuradio/gnuradio CMakeLists.txt :385 

endif(HAVE_WNO_UNUSED_CMD_LINE_ARG)