[Bug middle-end/54806] New: [4.7.2 Regression] Undefined symbols: "___emutls_v.*", ... on *-apple-darwin*

["whatmannerofburgeristhis at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54806

             Bug #: 54806
           Summary: [4.7.2 Regression] Undefined symbols: "___emutls_v.*",
                    ... on *-apple-darwin*
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: whatmannerofburgeristhis@gmail.com
              Host: *-apple-darwin*
            Target: *-apple-darwin*
             Build: *-apple-darwin*


Reopening of #50598

I'm seeing this problem on 4.7.2 when using c++11 packaged_task. The same code
worked yesterday with 4.7.1 before I updated.