[Bug c/19346] New: Wrong warnings about undefined aliases

["aj at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

With current GCC CVS I get lots of warnings when compiling glibc 
about aliases to undefined symbols: 
 
aj@gromit:~/tmp> /opt/gcc/4.0-devel/bin/gcc -O2 -c test.i 
test.i:2: warning: ?__libc_errno? aliased to undefined symbol ?errno? 
aj@gromit:~/tmp> nm test.o 
0000000000000004 C errno 
 
One testcase is: 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
int errno; 
extern  int __libc_errno __attribute__ ((alias ("errno"))); 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

-- 
           Summary: Wrong warnings about undefined aliases
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: aj at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: x86_64-linux-gnu
  GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19346