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

[GHC]

#4821: Passing -optP-traditional to the preprocessor breaks the build.
---------------------------------+------------------------------------------
    Reporter:  gwright           |       Owner:                     
        Type:  bug               |      Status:  new                
    Priority:  normal            |   Component:  Build System       
     Version:  7.0.1             |    Keywords:                     
    Testcase:                    |   Blockedby:                     
          Os:  Unknown/Multiple  |    Blocking:                     
Architecture:  Unknown/Multiple  |     Failure:  Building GHC failed
---------------------------------+------------------------------------------
 The build of 7.0.1 breaks when the preprocessor is explicitly specified by
 the -pgmP option and the -traditional flag is passed using -optP-
 traditional.  The trouble is that most of ghc requires -traditional flag,
 but .cmm files don't.  The -optP-traditional option needs to be filtered
 out from the options passed when compiling .cmm files.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4821>
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