usage_func 50 maint/gnulib/lib/long-options.c void (*usage_func) (int), usage_func 67 maint/gnulib/lib/long-options.c (*usage_func) (EXIT_SUCCESS); usage_func 73 maint/gnulib/lib/long-options.c va_start (authors, usage_func); usage_func 104 maint/gnulib/lib/long-options.c void (*usage_func) (int), usage_func 120 maint/gnulib/lib/long-options.c (*usage_func) (EXIT_SUCCESS); usage_func 126 maint/gnulib/lib/long-options.c va_start (authors, usage_func); usage_func 132 maint/gnulib/lib/long-options.c (*usage_func) (exit_failure); usage_func 39 maint/gnulib/lib/long-options.h void (*usage_func) (int),