[Bug lto/44966] New: weak LTO with gold causes ICE in lto_symtab_merge_decls_1

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

With the attached test case which tests WHOPR with weak aliases 
I get a segfault in lto_symtab_merge_decls_1 line 758

This happens in

          if (prevailing->node->same_body_alias)
            prevailing->node->same_body->local.used_from_object_file = true;
          else
            prevailing->node->local.used_from_object_file = true;

because node is NULL

Interestingly this only happens with gold, if I drop -fuse-linker-plugin
there is no segfault

This is an extract of a failure that occurred while buidling a much larger
project.


-- 
           Summary: weak LTO with gold causes ICE in
                    lto_symtab_merge_decls_1
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: andi-gcc at firstfloor dot org
 GCC build triplet: x86_64-linux
  GCC host triplet: x86_64-linux
GCC target triplet: x86_64-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44966