[GHC] #7602: Threaded RTS performing badly on recent OS X (10.8?)

[GHC]

#7602: Threaded RTS performing badly on recent OS X (10.8?)
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    Reporter:  simonmar          |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:  _|_             
   Component:  Runtime System    |     Version:  7.6.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by simonmar):

 gcc support register variables, which we use instead of `__thread` (see
 `rts/sm/GCTDecl.h`).  So we can use gcc until/unless they drop support for
 register variables.

 TLS requires support from the OS, which is why neither gcc nor Clang/LLVM
 can support it on OS X.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7602#comment:10>
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