* builtin-attrs.def (ATTR_NOTHROW_SENTINEL_1): New.

	* builtins.def (BUILT_IN_EXECLE): Set ATTR_NOTHROW_SENTINEL_1.
	* c-common.c (c_common_attribute_table): Accept parameters to
	sentinel attribute.
	(check_function_sentinel, handle_sentinel_attribute): Likewise.
	* doc/extend.texi: Update accordingly.

testsuite:
	* gcc.dg/format/sentinel-1.c: Update for parameter option.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@87098 138bc75d-0d04-0410-961f-82ee72b054a4