[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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Comment (by snowleopard):

 Simon: this is expected behaviour in this case. Dependency analysis of
 Haskell sources is performed on per package (not per file) basis, in one
 go. Whenever a single source file is changed, we invoke `ghc -M` on the
 whole package, which can take a while for a large package.

 This is how Make works too, but it often disables the tracking mechanism,
 which may lead to incorrect build results but is fast.

 Perhaps, we could/should switch to dependency analysis on the per-file
 basis (as we do with C sources), which would directly address this
 particular ticket without introducing yet another way to disable tracking.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16253#comment:3>
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