re PR middle-end/7651 (Define -Wextra strictly in terms of other warning flags)

2006-05-20  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	PR middle-end/7651
	* doc/invoke.texi (Wreturn-type): Complete description.
	(Wextra): Delete item about return-type warning.
	* c-decl.c: Delete redundant Wextra warning.

testsuite/
	* gcc.dg/20030906-1.c: Replace Wextra with Wreturn-type.
	* gcc.dg/20030906-2.c: Likewise.
	* objc.dg/method-17.m: Add -Wreturn-type.
	* obj-c++.dg/method-21.mm: Likewise.

From-SVN: r124866