http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47960
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-03-02 19:43:17 UTC --- Yes, from http://gcc.gnu.org/gcc-4.5/changes.html "The default behavior for comparing typeinfo names has changed, so in <typeinfo>, __GXX_MERGED_TYPEINFO_NAMES now defaults to zero." I think the changes were made to the trunk around October 2009
