[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:  normal      |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  6.12.2
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Difficult (2-5
       Type of failure:  Other       |  days)
             Test Case:              |       Blocked By:
              Blocking:              |  Related Tickets:
Differential Revisions:              |
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Comment (by simonmar):

 I agree that byte-identical build results might be useful (though
 difficult), I question whether you need it for ccache.  ccache doesn't
 need to compare build results, only build *inputs*; when the inputs are
 the same we can re-use the previous output.  It doesn't matter whether
 repeating the build would produce the exact same output, only that it is
 valid to re-use the previous output.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:57>
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