[GHC] #1893: ghc should say when it is failing due to -Werror

[GHC]

#1893: ghc should say when it is failing due to -Werror
-------------------------+--------------------------------------------------
    Reporter:  igloo     |       Owner:            
        Type:  bug       |      Status:  new       
    Priority:  normal    |   Milestone:  6.8 branch
   Component:  Compiler  |     Version:  6.8.1     
    Severity:  normal    |    Keywords:            
  Difficulty:  Unknown   |    Testcase:            
Architecture:  Unknown   |          Os:  Unknown   
-------------------------+--------------------------------------------------
 If we fail due to warnings and `-Werror`, we should tell the user that we
 are doing so. Currently it can be very confusing if `-Werror` is given in
 a Cabal file or an OPTIONS pragma. Compilation fails but with no error
 printed.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1893>
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