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

[GHC]

#910: --make should have a -j flag for parallel building
-------------------------------------+------------------------------------
        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:  8184, 8235
        Blocking:                    |  Related Tickets:
-------------------------------------+------------------------------------

Comment (by parcs):

 Replying to [comment:44 refold]:
 > Replying to [comment:22 parcs]:
 >
 > Is there some way to detect whether GHC has support for parallel
 `--make`? E.g. using `ghc --info`? I'd prefer to use that instead of
 conditioning on the version.

 What are the advantages of adding an entry to `ghc --info` over
 conditioning on the version, in this case?

 ----

 GHC no longer deadlocks from its use of `setNumCapabilities` (see #8209)
 but there is still another related issue: GHC sometimes prints

 {{{
 ghc-stage2: GHC.Event.Manager.loop: state is already Finished
 }}}

 when exiting. See #8235

 ----

 Ryan:

 That's really odd. I'm going to try `cabal install -j` with my branch
 later today and let you know how it goes.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/910#comment:48>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler