[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 Richard Eisenberg <rae@…>):

 In [changeset:"97e1f300e4f6aef06863d056dc7992fef6b21538/ghc"
 97e1f300/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="97e1f300e4f6aef06863d056dc7992fef6b21538"
 Fix compilation stopper on macOS with -Werror

 Commit 94f02547083cf6df686ea0b95fed050184c533de
 added some pragmas that allow GCC to compile GHC, but stop
 macOS's clang. This adds another counter-pragma to halp
 clang lumber along, too.

 Fixes #14977.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14977#comment:6>
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