[GHC] #15890: Provide a way for hadrian users to always pass some options to hadrian itself

[GHC]

#15890: Provide a way for hadrian users to always pass some options to hadrian
itself
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        Reporter:  alpmestan         |                Owner:  alpmestan
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Build System      |              Version:  8.7
  (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):  Phab:D5454
       Wiki Page:                    |
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Comment (by mpickering):

 Another problem with `UserSettings.hs` is that it's tracked by version
 control.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15890#comment:8>
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