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

[GHC]

#910: --make should have a -j flag for parallel building
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        Reporter:  igloo             |            Owner:
            Type:  feature request   |           Status:  patch
        Priority:  normal            |        Milestone:  _|_
       Component:  Compiler          |          Version:  6.4.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:  N/A               |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonmar):

 I'm impressed, it looks like you've done a great job. Well done.

 The parallel upsweep itself would look much nicer written using ParIO from
 monad-par, but that's something for the future.

 Take a careful look at `reTypecheckLoop`, I'm not sure it's correct (see
 my inline comment).

 The `FastString` changes need some more commentary, as pointed out by
 others.  There are good comments in the parallel upsweep patch though.

 You've obviously been careful to minimize the impact on sequential
 compilation performance, which is great.

 The parallel IO manager bug needs to be fixed before we can merge the
 patch though.  We can't ship it with a bug that causes random compilation
 failure.

 Aside from the issues above, I'm happy with the patch.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/910#comment:30>
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