{
  "all_compiler_flags_desc": {
    "##base_opt": {
      "choice": [
        "-O", 
        "" 
      ], 
      "default": "", 
      "desc": "base compiler flag", 
      "sort": 10000, 
      "tags": [
        "base", 
        "basic", 
        "optimization"
      ], 
      "type": "text"
    } 
  }
}