[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):

 > Would that solve the problem?

 Yes, switching to per-file dependencies in Hadrian would be easy if we had
 such flag.

 However, per-package vs per-file is a bit of a trade-off. Per-package
 analysis will likely be faster for the full build (you do analysis only
 once instead of for each file separately), whereas per-file analysis will
 be faster for incremental builds. (It is likely that the reduction of
 performance for the full build when switching to the per-file approach
 will be negligible, but we'll need to check this.)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16253#comment:6>
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