[GHC] #10205: On Windows ghc-pkg always reports cache out of date

[GHC]

#10205: On Windows ghc-pkg always reports cache out of date
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        Reporter:  hgolden           |                   Owner:  thomie
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:  7.10.2
       Component:  ghc-pkg           |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Windows           |            Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D990
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Comment (by thomie):

 Replying to [comment:3 Kludgy]:
 > EDIT: Not sure if it helps, but certain operations (like renaming a file
 with a directory) cause the directory modified time to be updated, usually
 leading to the directory modified time exceeding the file modified time.

 It was exactly this!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10205#comment:13>
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