[GHC] #11960: GHC parallel build failure during "make"

[GHC]

#11960: GHC parallel build failure during "make"
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        Reporter:  ilovezfs          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Build System      |              Version:  8.0.1-rc3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Building GHC      |  Unknown/Multiple
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ilovezfs):

 This is still happening repeatably with
 8.0.1-rc4/ghc-8.0.0.20160421-src.tar.xz

 My current workaround is
     inreplace "libffi/ghc.mk",
               "$(MAKE) -C libffi/build MAKEFLAGS=",
               "sync; $(MAKE) -C libffi/build MAKEFLAGS="

 which seems to fix the problem reliably.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11960#comment:1>
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