option), you will either need to also type the export command in your current session once to activate it, or log out and log back in since your profile commands are only executed on login.ĪFAIK, there is no need to explicitly install libiomp - not sure why you did that. Note that if you choose the second option above (i.e. Installation Steps on Mac Systems: brew install llvm. Then you can just do: g++-6 -std=c++11 -fopenmp. 1.2 Install OpenMP library: sudo apt-get install libomp-dev. Or, set up your PATH in your login profile: export PATH=/usr/local/bin:$PATH So, you either need to compile with: /usr/local/bin/g++-6 -std=c++11 -fopenmp main.cpp -o main Let the script run, and answer y whenever asked. A window should pop up asking you to either get Xcode or install. You need to know that homebrew installs everything in /usr/local/bin and that the C++ compiler is g++-6. Main steps: 1) Install the XCode Command Line Tools. Once you have got it installed, you need to make sure you are using the homebrew version rather than the one Apple supplies. So, I suspect you want: brew install gcc -without-multilib -without-fortran If you want to compile C++11 OpenMP code on OSX, the easiest way is to use gcc which you can install via homebrew.įirst, check the available options: brew options gccĮnable all compilers and languages, except Adaīuild with native language support (localization) Then when using clang++, use these flags: clang++ -Xpreprocessor -fopenmp main.cpp -o main -lomp To do that, first use homebrew to install brew install libomp: brew install libomp

Since my original answer below, the situation has improved and you can easily use OpenMP with the clang++ compiler - hurraaaay!

Brew install openmp