[GHC] #4012: Compilation results are not deterministic

[GHC]

#4012: Compilation results are not deterministic
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        Reporter:  kili              |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  6.12.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Other             |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by Fuuzetsu):

 Oh, by the way, there was a small experiment ran by nix users to judge the
 impact of this issue on parallel builds. You can find the results at
 https://github.com/peti/ghc-library-id-bug

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:104>
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