[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
           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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 This keeps happening (in the same place every time):
 {{{
 config.status: executing libtool commands
 config.status: executing include commands
 config.status: executing src commands
 # wc on OS X has spaces in its output, which libffi's Makefile
 # doesn't expect, so we tweak it to sed them out
 mv libffi/build/Makefile libffi/build/Makefile.orig
 sed "s#wc -w#wc -w | sed 's/ //g'#" < libffi/build/Makefile.orig >
 libffi/build/Makefile
 "touch" libffi/stamp.ffi.static-shared.configure
 make: *** [all] Error 2

 }}}

 Adding some sleep in various places seems to work around it, so it appears
 to be a race of some kind during parallel builds.

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