brew install clang-omp not working

Question

I need to compile a C++ code with OpenMP on my Mac. Unfortunately the default version of clang installed on the Mac (703.0.31) does not support OpenMP. Therefore, I am tryin

Answer 1

OpenMP was officially included in the brew (before the method, either install llvm, or outdated clang-omp).

brew install libomp

Answer 2

clang-omp has been boneyarded. See this commit: https://github.com/Homebrew/homebrew-core/commit/c57e30773:

clang-omp: migrate to boneyard

Functionality is now available as part of LLVM in Homebrew. So just install llvm

Answer 3

Install a deleted formula

brew install homebrew/boneyard/clamp-omp

OR

brew tap homebrew/boneyard
brew install clang-omp

Reference: https://superuser.com/questions/1110414/install-a-deleted-homebrew-formulae/1110934#1110934

Then you need to set the environment:

export C_INCLUDE_PATH=/usr/local/Cellar/libiomp/20150401/include/libiomp:$C_INCLUDE_PATH

export CPLUS_INCLUDE_PATH=/usr/local/Cellar/libiomp/!date!/include/libiomp:$CPLUS_INCLUDE_PATH

export LIBRARY_PATH=/usr/local/Cellar/libiomp/!date!/lib:$LIBRARY_PATH

Answer 4

You can install llvm using brew since it now includes openmp.

brew install llvm

You can make a symlink if you want

ln -s /usr/local/opt/llvm/bin/clang /usr/local/bin/clang-omp

My makefile looks like this

CPP = /usr/local/opt/llvm/bin/clang
CPPFLAGS = -I/usr/local/opt/llvm/include -fopenmp
LDFLAGS = -L/usr/local/opt/llvm/lib

example: example.c
    $(CPP) $(CPPFLAGS) $^ -o $@ $(LDFLAGS)