Add appropriate OPT_W* to warnings.

["Manuel López-Ibáñez" <lopezibanez at gmail dot com>]

This patch adds the appropriate OPT_W option to several warnings. I
only went for the clear cases that won't change the current behaviour
with respect to -Woption and -Wno-option but will enable
-Werror=option and -Wno-error=option.

Bootstrapped and regression tested on x86_64-unknown-linux-gnu.

OK for trunk?

2008-02-25  Manuel Lopez-Ibanez <manu@gcc.gnu.org>

	* c-common.c (match_case_to_enum_1): Add appropriate
	OPT_W* parameter to warning.
	(c_do_switch_warnings): Likewise.
	* c-typeck.c (warning_init): Add one more parameter following
	'warning' function.
	(push_init_level): Update call to warning_init.
	(pop_init_level): Likewise.
	(add_pending_init): Likewise.
	(output_init_element: Likewise.

cp/
	* typeck.c (build_class_member_access_expr): Add appropriate
	OPT_W* parameter to warning.
	(build_reinterpret_cast_1): Likewise.
	* name-lookup.c (push_overloaded_decl): Likewise.

testsuite/	
	* gcc.dg/20011021-1.c: Use two directives to match two different
	messages.
	* gcc.dg/Wswitch-enum-error.c: New.
	* gcc.dg/Wswitch-error.c: New.

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