[GHC] #618: Dependency caching in ghc --make

[GHC]

#618: Dependency caching in ghc --make
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        Reporter:  simonmar          |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  ⊥
       Component:  Compiler          |              Version:  None
      Resolution:  None              |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:  N/A
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ezyang):

 dobenour: SQLite, or really any single file database, could be used, but
 this would change GHC's compilation model to output some extra files
 besides the files it normally outputs. I'm a little loathe to do this when
 we ought to be able to just read out the cached dependencies from the
 interface files we generate.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/618#comment:10>
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