[GHC] #12135: Failure to recompile when #include file is created earlier on include path

[GHC]

#12135: Failure to recompile when #include file is created earlier on include path
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        Reporter:  NeilMitchell      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Driver            |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by ezyang):

 * owner:  ezyang =>


Comment:

 It's unclear how to get the preprocessor to divulge what paths were
 searched. However, if we can get this information, then it should be
 relatively easy to track file non-existence in usages. The recipe for
 getting the preprocessor to produce this information is of general
 interest; I've filed a bug with Shake to see if there's a good way to get
 the info out of `cpp`: https://github.com/ndmitchell/shake/issues/463

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12135#comment:4>
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