For full OpenMP support in LLVM/Clang that's hoped for Clang 3.7 after some OpenMP pragmas made it in for LLVM Clang 3.6. It looks like the 3.7 release will indeed deliver better OMP support with more functionality having been implemented in recent days...
March 12, 2015
More OpenMP Support Has Been Hitting LLVM's Clang
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