[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         |   Resolution:                     
  Keywords:                 |   Difficulty:  very easy (<1 hour)
Ghcversion:                 |     Platform:                     
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Changes (by duncan):

  * difficulty:  unknown => very easy (<1 hour)

Comment:

 Should be easy to switch it. Whoever does this should also test what the
 failure mode is when cpphs is not available and the package forgets to
 mention `build-tools: cpphs`.

 On a related note we should warn about any tools used that are not
 declared. Indeed perhaps we should say that packages that declare a
 minimum version of Cabal are actually opting in to stricter behaviour,
 like not configuring build tools that are not explicitly declared. Or
 perhaps that should be done by a different mechanism.

-- 
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/519#comment:1>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects