gcc/c-family/ChangeLog:

	PR translation/80280
	* c-format.h (struct format_flag_spec): Add new member.
	(T89_T): New macro.
	* c-format.c (local_tree_type_node): New global.
	(printf_flag_specs, asm_fprintf_flag_spec): Initialize new data.
	(gcc_diag_flag_specs, scanf_flag_specs, strftime_flag_specs): Ditto.
	(strfmon_flag_specs): Likewise.
	(gcc_diag_char_table, gcc_cdiag_char_table): Split up specifiers
	with distinct quoting properties.
	(gcc_tdiag_char_table, gcc_cxxdiag_char_table): Same.
	(flag_chars_t::validate): Add argument and handle bad quoting.
	(check_format_info_main): Handle quoting problems.
	(init_dynamic_diag_info): Simplify.

gcc/testsuite/ChangeLog:

	PR translation/80280
	* gcc.dg/format/gcc_diag-10.c: New test.

From-SVN: r247778