ghc HEAD can't validate with xcode 6 clang on OS X

[Kazu Yamamoto (=?iso-2022-jp?B?GyRCOzNLXE9CSScbKEI=?=)]

Hi Carter,

> on OS X 10.9
> if i do
> git clone --recursive git://git.haskell.org/ghc.git ghc-valifail
> cd ghc-valifail
> perl boot
> ./configure --with-gcc=clang # the with gcc bit isnt needed, but making it
> clearly pick up clang is the point
> ./validate --fast

No problem on my OS X 10.9. The result of "CPUS=10 sh validate" today:

OVERALL SUMMARY for test run started at Wed Nov 26 13:50:48 2014 JST
 0:04:28 spent to go through
    4235 total tests, which gave rise to
   16491 test cases, of which
   12593 were skipped

      56 had missing libraries
    3768 expected passes
      67 expected failures

       0 caused framework failures
       0 unexpected passes
       6 unexpected failures
       1 unexpected stat failures

Unexpected failures:
   cabal/cabal01                            cabal01 [bad exit code] (normal)
   cabal/cabal06                            cabal06 [bad stdout] (normal)
   llvm/should_compile                      T5681 [exit code non-0] (optllvm)
   llvm/should_compile                      T7571 [exit code non-0] (optllvm)
   llvm/should_run/subsections_via_symbols  subsections_via_symbols [bad exit code] (normal)
   rts                                      T5435_dyn_asm [bad stdout] (normal)

Unexpected stat failures:
   perf/compiler  T4801 [stat too good] (normal)


--Kazu