[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 request   |               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 adamse):

 Unless I am misunderstanding this would be exactly the same behaviour as
 default ./configure which will look for alex and happy in path, the issue
 brought up in the original ticket is that alex and happy that are
 installed by cabal but not visible in the run time PATH.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16120#comment:3>
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