title: Change compiler to clang-omp++ in xcode
body: <p>I'm trying to follow the instructions on <a href="https://clang-omp.github.io/#try-openmp-clang" rel="nofollow">OpenMP®/Clang</a> to enable openmp in Xcode. But <code>Add a new user-defined setting CC with the value /usr/local/bin/clang-omp</code> confuses me. I tried to change the Build Settings->Build Options-> Compilers for C/C++/Objective-C to /usr/local/bin/clang-omp++, but I got <code>Unsupported Compiler</code> error.</p>
  
  <p>Please help, thanks ahead.</p>