message: prevent warnings
diff: {
  "cflags!": [ "-fno-exceptions"],
  "cflags_cc!": [ "-fno-exceptions"],
  - "cflags": [ "-Wno-literal-suffix" ],
  - "cflags_cc": [ "-Wno-literal-suffix" ]
  + "cflags": [ "-Wno-unknown-warning-option -Wno-literal-suffix -Wno-reserved-user-defined-literal" ],
  + "cflags_cc": [ "-Wno-unknown-warning-option -Wno-literal-suffix -Wno-reserved-user-defined-literal" ]
  }
  ]
  