Enable OpenMP support in clang in Mac OS X (sierra & Mojave)

Question

I am using Mac OS X Sierra, and I found that clang (LLVM version 8.1.0 (clang-802.0.38)) does not support OpenMP: when I run clang -fopenmp program_name.c, I go

Answer 1

Other people have given one solution (using Homebrew llvm). You can also use OpenMP with Apple Clang and Homebrew libomp (brew install libomp). Just replace a command like clang -fopenmp test.c with clang -Xpreprocessor -fopenmp test.c -lomp.