[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
      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 bgamari):

 Fair point; I should have left a note about this. I've added one in
 02c689cd1ce2a55adf6318eb9bd69f227f1abda2.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11119#comment:3>
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