re PR c/79677 (Weird handling of -Werror=)

re PR c/79677 (Weird handling of -Werror=)

	PR c/79677
	* opts.h (handle_generated_option): Add GENERATED_P argument.
	* opts-common.c (handle_option): Adjust function comment.
	(handle_generated_option): Add GENERATED_P argument, pass it to
	handle_option.
	(control_warning_option): Pass false to handle_generated_option
	GENERATED_P.
	* opts.c (maybe_default_option): Pass true to handle_generated_option
	GENERATED_P.
	* optc-gen.awk: Likewise.
ada/
	* gcc-interface/misc.c (gnat_handle_option): Pass true to
	handle_generated_option GENERATED_P.
testsuite/
	* gcc.dg/pr79677.c: New test.

From-SVN: r245728