This change is from an idea suggested by Arthur David Olson.

This change is from an idea suggested by Arthur David Olson.

	* c-common.c (decl_attributes, record_function_format,
	check_format_info, init_function_format_info):
	Add support for strftime format checking.
	(enum format_type): New type.
	(record_function_format): Now static, and takes value of type
	enum format_type instead of int.
	(time_char_table): New constant.
	(struct function_format_info): format_type member renamed from is_scan.
	(check_format_info): Use `warning' rather than sprintf followed by
	`warning', to avoid mishandling `%' in warnings.
	Change `pedwarn' to `warning', since these warnings do not necessarily
	mean the program does not conform to the C Standard, as the code
	need not be executed.
	* c-tree.h (record_function_format): Remove decl; no longer extern.
	* extend.texi: Add documentation for strftime format checking.

From-SVN: r19151