[GHC] #10543: MacOS: validate fails on \u

[GHC]

#10543: MacOS: validate fails on \u
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        Reporter:  trommler          |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:
       Component:  Build System      |                 Version:  7.10.1
      Resolution:  invalid           |                Keywords:  cpp
Operating System:  MacOS X           |            Architecture:
 Type of failure:  Building GHC      |  Unknown/Multiple
  failed                             |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D1004
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Comment (by geoff):

 So, I was the one to add this line — overriding `-Wno-invalid-pp-token
 -Wno-unicode -Wno-trigraphs` — because these flags are not universally
 supported by clang. If anyone could help me understand this better, it
 would be appreciated.
 https://github.com/Homebrew/homebrew/issues/41777#issuecomment-122826887

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10543#comment:5>
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