[GHC] #7651: Buiding GHC with parallel IO manager freezes on Mac (not on FreeBSD)

[GHC]

#7651: Buiding GHC with parallel IO manager freezes on Mac (not on FreeBSD)
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        Reporter:  kazu-yamamoto        |            Owner:
            Type:  bug                  |           Status:  new
        Priority:  high                 |        Milestone:  7.8.1
       Component:  Build System         |          Version:  7.7
      Resolution:                       |         Keywords:
Operating System:  MacOS X              |     Architecture:
 Type of failure:  Building GHC failed  |  Unknown/Multiple
       Test Case:                       |       Difficulty:  Unknown
        Blocking:                       |       Blocked By:
                                        |  Related Tickets:
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Comment (by kazu-yamamoto):

 I can build GHC head in parallel even on Mavericks. See #8497 and #8102.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7651#comment:10>
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