[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):

 The changes to handle loops look OK to me, but I would test it on a GHC
 build to be sure.  You want to build the whole of `ghc/compiler` with
 `--make -O2`; the build system doesn't do this so you have to make a
 command line by hand.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/910#comment:34>
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