[GHC] #4821: Passing -optP-traditional to the preprocessor breaks the build.

[GHC]

#4821: Passing -optP-traditional to the preprocessor breaks the build.
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    Reporter:  gwright           |        Owner:                     
        Type:  bug               |       Status:  new                
    Priority:  normal            |    Milestone:                     
   Component:  Build System      |      Version:  7.0.1              
    Keywords:                    |     Testcase:                     
   Blockedby:                    |   Difficulty:                     
          Os:  Unknown/Multiple  |     Blocking:                     
Architecture:  Unknown/Multiple  |      Failure:  Building GHC failed
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Comment(by simonmar):

 Copying the comment I made on `cvs-ghc`:

 > This patch seems slight invasive, affecting the suffix rules themselves.
 I'd like to understand a bit more about why this is necessary - why does
 SRC_HC_OPTS contain -optP-traditional in the first place?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4821#comment:2>
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