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* c-format.c (FMT_FLAG_DOLLAR_GAP_POINTER_OK): New. (format_types): Use it for scanf. (dollar_arguments_pointer_p): New. (init_dollar_format_checking): Store details of which arguments are pointers. (maybe_read_dollar_number): Reallocate dollar_arguments_pointer_p. (finish_dollar_format_checking): Take extra parameter pointer_gap_ok. Treat unused arguments differently if pointer_gap_ok and the unused arguments are pointers. (check_format_info_main): Pass extra argument to finish_dollar_format_checking. * doc/invoke.texi (-Wno-format-extra-args): Document behavior when unused arguments are present between used arguments with operand numbers. testsuite: * gcc.dg/format/strfmon-1.c: Update comments. Adjust examples from Austin Group draft 7. * gcc.dg/format/xopen-1.c: Update comments. Add tests for gaps in scanf format arguments. * gcc.dg/format/no-exargs-2.c: New test. From-SVN: r47327
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