[Hackage] #519: .cpphs files are processed using GHC's built-in CPP instead of cpphs

[Hackage]

#519: .cpphs files are processed using GHC's built-in CPP instead of cpphs
----------------------------+-----------------------------------------------
  Reporter:  Deewiant       |        Owner:         
      Type:  enhancement    |       Status:  new    
  Priority:  normal         |    Milestone:         
 Component:  Cabal library  |      Version:  1.6.0.2
  Severity:  normal         |     Keywords:         
Difficulty:  unknown        |   Ghcversion:         
  Platform:                 |  
----------------------------+-----------------------------------------------
 Currently, if you need to use `cpphs`, the only way of going about it is
 to define a custom `PreProcessor` in your `Setup.hs` and using it as an
 override in `hookedPreProcessors`. A seemingly sensible way of making this
 easier would be that `.cpphs` files prefer being processed by `cpphs`
 instead of GHC's built-in CPP. (Most people probably just use `{-#
 LANGUAGE CPP #-}` in a `.hs` for the latter anyway.)

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/519>
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