(0) called. */
#define ARGP_NO_HELP	0x10

/* Don't exit on errors (they may still result in error messages).  */
#define ARGP_NO_EXIT	0x20

/* Use the gnu getopt `long-only' rules for parsing arguments.  */
#define ARGP_LONG_ONLY	0x40

/* Turns off any message-printing/exiting options.  */
#define ARGP_SILENT    (ARGP_NO_EXIT | ARGP_NO_ERRS | ARGP_NO_HELP)

/* Parse the options strings in ARGC & ARGV according to the options in ARGP.
   FLAGS is one of the ARGP_ flags above.  If ARG_INDEX is non-NULL, the
   index in ARGV of the first unparsed option is returned in it.  If an
   unknown option is present, ARGP_ERR_UNKNOWN is returned; if some parser
   routine returned a non-zero value, it is returned; otherwise 0 is
   returned.  This function may also call exit unless the ARGP_NO_HELP flag
   is set.  INPUT is a pointer to a value to be passed in to the parser.  */
extern error_t argp_parse (const struct argp *__restrict __argp,
			   int __argc, char **__restrict __argv,
			   unsigned __flags, int *__restrict __arg_index,
			   void *__restrict __input);
extern error_t __argp_parse (const struct argp *__restrict __argp,
			     int __argc, char **__restrict __argv,
			     unsigned __flags, int *__restrict __arg_index,
			     void *__restrict __input);