re PR c/48088 (-Werror=frame-larger-than=100 does not work as expected)

re PR c/48088 (-Werror=frame-larger-than=100 does not work as expected)

	PR c/48088
	PR c/68657
	* common.opt (Wframe-larger-than=): Add Warning.
	* opts.h (control_warning_option): Add ARG argument.
	* opts-common.c (cmdline_handle_error): New function.
	(read_cmdline_option): Use it.
	(control_warning_option): Likewise.  Add ARG argument.
	If non-NULL, decode it if needed and pass through
	to handle_generated_option.  Handle CLVC_ENUM like
	CLVC_BOOLEAN.
	* opts.c (common_handle_option): Adjust control_warning_option
	caller.
	(enable_warning_as_error): Likewise.
c-family/
	* c.opt (Wfloat-conversion, Wsign-conversion): Add Warning.
	* c-pragma.c (handle_pragma_diagnostic): Adjust
	control_warning_option caller.
ada/
	* gcc-interface/trans.c (Pragma_to_gnu): Adjust
	control_warning_option caller.
testsuite/
	* c-c++-common/pr68657-1.c: New test.
	* c-c++-common/pr68657-2.c: New test.
	* c-c++-common/pr68657-3.c: New test.
	* gcc.dg/cpp/warn-normalized-3.c: Use
	-Werror=normalized=nfc instead of -Werror=normalized=
	in dg-options.

From-SVN: r231406