[GHC] #1290: ghc runs preprocessor too much

[GHC]

#1290: ghc runs preprocessor too much
----------------------+-----------------------------------------------------
  Reporter:  guest    |          Owner:         
      Type:  bug      |         Status:  new    
  Priority:  normal   |      Milestone:         
 Component:  Driver   |        Version:  6.7    
  Severity:  normal   |       Keywords:         
Difficulty:  Unknown  |             Os:  Unknown
  Testcase:           |   Architecture:  Unknown
----------------------+-----------------------------------------------------
When an external preprocessor has been specified with -F -pgmF, and then
 using ghc --make, ghc runs the preprocessor on every .hs file, even those
 for which compilation is skipped.  This seem unnecessary and it slows down
 recompilation significantly when you have many files.

   -- Lennart

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1290>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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