[GHC] #16242: Hadrian is too aggressive in rebuilding

[GHC]

#16242: Hadrian is too aggressive in rebuilding
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        Reporter:  goldfire          |                Owner:  (none)
            Type:  bug               |               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 alpmestan):

 > As to whether Hadrian should emulate this, I'm torn. Certainly we should
 have some target for running the testsuite against an arbitrary out-of-
 tree GHC. However, it would make sense if hadrian test tested the current
 working directory.

 FWIW, I have implemented this as part of my work to tweak the `validate`
 script to support hadrian. Required several changes. I'll push a MR
 tomorrow I think.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16242#comment:10>
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