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clangopenmphomebrewosx-elcapitan

brew install clang-omp not working

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 trying to install the clang-omp package with brew (e.g., following this guide). The issue is that brew cannot find neither the libiomp, nor the clang-omp package:

$ brew install clang-omp
Error: No available formula with the name "clang-omp"
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching taps...
Error: No formulae found in taps.

I am wondering whether clang-omp is still provided by brew. Or am I doing something wrong? Any ideas?

Edit: If I do brew search I get the following:

$ brew search clang
clang-format           emacs-clang-complete-async
Caskroom/cask/openclonk-c54d917-darwin-amd64-clang

Thus, no evidence of clang-omp. Is it possible I have to change repository or something like this?

Solution

  • 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)