[GHC] #8493: Can't compile happy + ghc with clang's CPP

[GHC]

#8493: Can't compile happy + ghc with clang's CPP
----------------------------------------+----------------------------------
        Reporter:  maxs                 |            Owner:
            Type:  bug                  |           Status:  new
        Priority:  highest              |        Milestone:  7.8.1
       Component:  libraries (other)    |          Version:  7.7
      Resolution:                       |         Keywords:  happy clang
Operating System:  MacOS X              |     Architecture:
 Type of failure:  Building GHC failed  |  Unknown/Multiple
       Test Case:                       |       Difficulty:  Unknown
        Blocking:                       |       Blocked By:
                                        |  Related Tickets:
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Comment (by maxs):

 Yeah it currently is.

 {{{
 maxs$ gcc -v
 Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
 Target: x86_64-apple-darwin12.5.0
 Thread model: posix
 clang: warning: argument unused during compilation: '-Wno-invalid-pp-
 token'
 clang: warning: argument unused during compilation: '-Wno-unicode'
 clang: warning: argument unused during compilation: '-Wno-trigraphs'
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8493#comment:14>
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