c++/9165: [3.3/3.4 regression] false "defined but not used" warnings

[Janis Johnson]

The regression showed up with this patch:

2002-10-11  Mark Mitchell  <mark@codesourcery.com>

        * NEWS
        * class.c
        * cp-tree.h
        * decl.c
        * decl2.c
        * init.c
        * parse.y
        * rtti.c
        * typeck2.c

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9165