[GHC] #11119: WERROR in build.mk doesn't work

[GHC]

#11119: WERROR in build.mk doesn't work
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           Reporter:  goldfire       |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  7.11
           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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 There is a line in `build.mk.sample` that suggests setting
 `WERROR=-Werror` will turn warnings into errors. This used to work. But
 now it doesn't, as confirmed by examining the command using `V=1`.

 I believe the change happened in the last 2-3 weeks.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11119>
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