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This is a quick technical post, that is as much about disseminating the information as putting it in a place where I can find it again in the future. I have been trying to use openMP in an R package that I am currently developing. OpenMP is supported by the popular gcc compiler. However, OS-X Xcode now ship with a clang compiler that does not support openMP. So first one needs to install gcc (from homebrew for instance). The thing is then to get R to actually use this gcc compiler. After many hours of struggle, I got it working by modifying the “~/.R/Makevars” file, in which clang must be replaced by gcc (or gcc-$version).
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