[GHC] #16253: Offer a shorthand for `--skip=_build/stage$n/compiler/.dependencies.mk`

[GHC]

#16253: Offer a shorthand for `--skip=_build/stage$n/compiler/.dependencies.mk`
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        Reporter:  sgraf             |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Build System      |              Version:  8.6.3
  (Hadrian)                          |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by snowleopard):

 * cc: NeilMitchell (added)


Comment:

 Speaking of the trade-off, perhaps, this is a nice use case for Shake's
 "batching" feature:

 http://hackage.haskell.org/package/shake-0.17.4/docs/Development-
 Shake.html#v:batch

 We could have a batching rule for dependency analysis: if multiple files
 need to be analysed, their analysis could be combined into a single GHC
 invocation. That would be quite cool.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16253#comment:7>
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