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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/49440] [4.5/4.6/4.7 regression] Invalid dynamic_cast for unnamed namespace
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49440

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.06.22 21:00:47
                 CC|                            |jason at gcc dot gnu.org
         AssignedTo|unassigned at gcc dot       |jason at gcc dot gnu.org
                   |gnu.org                     |
            Summary|Invalid dynamic_cast for    |[4.5/4.6/4.7 regression]
                   |unnamed namespace           |Invalid dynamic_cast for
                   |                            |unnamed namespace
     Ever Confirmed|0                           |1

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-06-22 21:00:47 UTC ---
This is related to the change to use string comparison for matching type_infos.
 We have a special case for file-local symbols, but aren't using it here for
some reason.

http://gcc.gnu.org/ml/gcc/2009-08/msg00258.html