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