PR c++/10538, PR c/5582

PR c++/10538, PR c/5582

ChangeLog:
        * langhooks-def.h (lhd_decl_uninit): Declare.
        (LANG_HOOKS_DECL_UNINIT): New macro.
        (LANG_HOOKS_INITIALIZER): Adjust.
        * langhooks.h (struct lang_hooks): Add new field
        decl_uninit.
        * langhooks.c (lhd_decl_uninit): Define.
        * c-common.c (c_decl_uninit_1): New function.
        (c_decl_uninit): New function.
        (warn_init_self): Define.
        * c-common.h (c_decl_uninit): Declare.
        (warn_init_self): Declare.
        * c.opt: Introduce -Winit-self.
        * c-opts.c (c_common_handle_options): Set warn_init_self.
        * c-lang.c (LANG_HOOKS_DECL_UNINIT): Define.
        * objc/objc-lang.c  (LANG_HOOKS_DECL_UNINIT): Define.
        * function.c (uninitialized_vars_warning): Call the language hook.
        * doc/invoke.texi: Document -Winit-self.

cp/ChangeLog:
        * cp/cp-lang.c (LANG_HOOKS_DECL_UNINIT): Define.

testsuite:
        * gcc.dg/uninit-D.c: New Test.
        * gcc.dg/uninit-E.c: New Test.
        * gcc.dg/uninit-F.c: New Test.
        * gcc.dg/uninit-G.c: New Test.

From-SVN: r70574