OPTION_REMAINING

If a long option in the main group has this name, it is not treated as a regular option. Instead it collects all non-option arguments which would otherwise be left in argv. The option must be of type %G_OPTION_ARG_CALLBACK, %G_OPTION_ARG_STRING_ARRAY or %G_OPTION_ARG_FILENAME_ARRAY.

Using %G_OPTION_REMAINING instead of simply scanning argv for leftover arguments has the advantage that GOption takes care of necessary encoding conversions for strings or filenames.