[GHC] #3542: ghc-cabal deadlocks

[GHC]

#3542: ghc-cabal deadlocks
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    Reporter:  igloo             |        Owner:                  
        Type:  bug               |       Status:  new             
    Priority:  high              |    Milestone:  6.12.1          
   Component:  Build System      |      Version:  6.10.4          
    Severity:  normal            |   Resolution:                  
    Keywords:                    |   Difficulty:  Unknown         
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
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Comment (by duncan):

 Ah yes, ok and I guess that extends ok to discarding both stdout and
 stderr. We just wait for both MVars.

 Perhaps it'd be useful to have an extra `StdStream` constructor  for
 `UseNullHandle` (or a better name) to use `/dev/null` on POSIX or `nul` on
 Windows.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3542#comment:5>
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