[GHC] #14977: Clang doesn't support -Wsync-nand

[GHC]

#14977: Clang doesn't support -Wsync-nand
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.5
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Building GHC      |  Unknown/Multiple
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 Note that this happens only with `-Werror` specified in your build.mk, and
 removing `-Werror` allows you to proceed.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14977#comment:4>
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