[GHC] #14142: Can't invert -dno-debug-output

[GHC]

#14142: Can't invert -dno-debug-output
-------------------------------------+-------------------------------------
           Reporter:  simonpj        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.1
           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:
-------------------------------------+-------------------------------------
 `mk/flavours/validate.mk` sets
 {{{
 GhcStage2HcOpts = -dno-debug-output
 }}}
 and there is no way to undo it.  E.g. you can't add
 {{{
 GhcStage2HcOpts += -ddebug-output
 }}}
 to your `mk/validate.mk` does not work.

 We should add `-ddebug-output` to invert it.  Easy task.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14142>
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