[GHC] #910: --make should have a -j flag for parallel building

[GHC]

#910: --make should have a -j flag for parallel building
------------------------------+---------------------------------------------
 Reporter:  igloo             |           Type:  feature request 
   Status:  new               |       Priority:  normal          
Milestone:  _|_               |      Component:  Compiler        
  Version:  6.4.2             |       Keywords:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown      |     Difficulty:  Unknown         
 Testcase:  N/A               |      Blockedby:                  
 Blocking:                    |        Related:                  
------------------------------+---------------------------------------------

Comment(by simonmar):

 Attached a patch I had lying around to make `FastString` thread-safe.
 IIRC it had a small compile-time performance impact.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/910#comment:12>
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