[GHC] #4012: Compilation results are not deterministic

[GHC]

#4012: Compilation results are not deterministic
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        Reporter:  kili              |                   Owner:  Fuuzetsu
            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 nomeata):

 I have rooted out another cause for indeterminism and the Debian
 reproducibilty project managed to compile GHC with a bit-wise identical
 output:
 https://reproducible.debian.net/rb-pkg/experimental/amd64/ghc.html

 See Phab:D910 for a patch.

 I doubt that this solves the problem completely, but it is a step towards
 it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:86>
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