[GHC] #16120: Hadrian should use cabal build-tools installed Alex and Happy if necessary

[GHC]

#16120: Hadrian should use cabal build-tools installed Alex and Happy if necessary
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           Reporter:  adamse         |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.6.3
  (Hadrian)                          |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 hadrian.cabal specifies alex and happy as build-tools, we should make
 hadrian pass them to ./configure when hadrian is running with {{{-c}}}

 (Migrated from https://github.com/snowleopard/hadrian/issues/706)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16120>
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