Github user omalley commented on the issue:

    https://github.com/apache/orc/pull/134
  
    
    
    .. Owen
    
    > On Aug 18, 2017, at 07:14, jamesclampffer <notificati...@github.com> 
wrote:
    > 
    > @majetideepak Is there a way to get the OSX CI to use a generic 
LLVM/Clang install rather than the one that gets shipped with OSX?
    > 
    
    Don't do that. If it doesn't compile with the "real" Mac OS compiler, 
you'll break my dev platform.
    > Apparently they apply a patch to Clang to break thread_local, my 
understanding is they don't want to break the ABI if they ever get around to 
making builtin thread local specialized for their OS.
    > 
    >         .Case("cxx_thread_local",
    > -                 LangOpts.CPlusPlus11 && 
PP.getTargetInfo().isTLSSupported() &&
    > -                 !PP.getTargetInfo().getTriple().isOSDarwin())
    > +                 LangOpts.CPlusPlus11 && 
PP.getTargetInfo().isTLSSupported())
    > Otherwise this won't get coverage on OSX CI builds.
    > 
    > —
    > You are receiving this because you were mentioned.
    > Reply to this email directly, view it on GitHub, or mute the thread.
    > 



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