[GHC] #4132: Generate .o, .dyn_o, .p_o etc. simultaneously

[GHC]

#4132: Generate .o, .dyn_o, .p_o etc. simultaneously
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    Reporter:  ksf               |       Owner:              
        Type:  feature request   |      Status:  new         
    Priority:  normal            |   Component:  Compiler    
     Version:  6.12.3            |    Keywords:              
          Os:  Unknown/Multiple  |    Testcase:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
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 I guesstimate there's a lot of work being unnecessarily duplicated when
 cabal calls ghc multiple times for each way, leading to unnecessarily long
 build times.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4132>
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