You should (read: I've not tested this myself...) be able to assign clang-omp and clang-omp++ to CC and CXX, respectively, in your ~/.R/Makevars file. On Mon, Mar 14, 2016 at 9:31 AM Balamuta, James Joseph < balam...@illinois.edu> wrote:
> Greetings and Salutations, > > > > OS X does not currently support OpenMP under the default compiler (clang). > Hence, you are receiving an error as it relates to the header file not > being found. For more details, see: > > > > https://cran.r-project.org/doc/manuals/r-release/R-exts.html#OpenMP-support > > > > Support for OpenMP with clang should be arriving sometime in June after > WWDC as the intel funded clang-OpenMP feature has been merged into the main > clang branch. ( http://openmp.llvm.org/ , https://clang-omp.github.io/ ) > > If this is just for personal use, you may wish to set the ~/.R/Makevar > information for R via: > > https://cran.r-project.org/doc/manuals/r-release/R-admin.html#OS-X-packages > > > VER=-4.8 > > CC=gcc$(VER) > > CXX= g++$(VER) > > CFLAGS=-mtune=native -g -O2 -Wall -pedantic -Wconversion > > CXXFLAGS=-mtune=native -g -O2 -Wall -pedantic -Wconversion > > FLIBS=-lgfortran > > > > Sincerely, > > > > JJB > > > > *From:* rcpp-devel-boun...@lists.r-forge.r-project.org [mailto: > rcpp-devel-boun...@lists.r-forge.r-project.org] *On Behalf Of * > aakrem...@aol.com > *Sent:* Monday, March 14, 2016 10:01 AM > *To:* rcpp-devel@lists.r-forge.r-project.org > *Subject:* [Rcpp-devel] fatal error: 'omp.h' file not found > > > > Dear Rcpp development list members, > > I am trying to use OpenMP with Rcpp. The code (placed in > omp_experiment.cpp file) is pretty basic: > > #include <RcppArmadillo.h> > #include <omp.h> > > //[[Rcpp::plugins(openmp)]] > //[[Rcpp::depends(RcppArmadillo)]] > using namespace Rcpp; > > // [[Rcpp::export]] > int timesTwo(int x) { > return x * 2; > } > > > > Once I try to compile the file I get the error output > > clang: warning: argument unused during compilation: '-fopenmp' > omp_experiment.cpp:2:10: fatal error: 'omp.h' file not found > #include <omp.h> > ^ > 1 error generated. > make: *** [omp_experiment.o] Error 1 > clang++ -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG > -I/usr/local/include -I/usr/local/include/freetype2 -I/opt/X11/include > -I"/Library/Frameworks/R.framework/Versions/3.2/Resources/library/Rcpp/include" > -I"/Library/Frameworks/R.framework/Versions/3.2/Resources/library/RcppArmadillo/include" > -I"/Users/anguelgrigorov/Documents/Business/MISO/R/Functions/Trading/Experiments" > -fopenmp -fPIC -Wall -mtune=core2 -g -O2 -c omp_experiment.cpp -o > omp_experiment.o > Error in > Rcpp::sourceCpp("Documents/Business/MISO/R/Functions/Trading/Experiments/omp_experiment.cpp") > : > Error 1 occurred building shared library. > > *My QUESTION: How to configure OpenMP to work with Rcpp on my system?* > > I am working with RStudio, version 0.98.945 on Mac OS X Mavericks. > > Every insight into this will be highly appreciated. > > Thank you very much in advance. > > Anguel > > > P.S. I've done some reading on the Internet that advised me to check > whether omp.h is even available on my laptop (MacBook Pro). I have used OS > X > locate "omp.h" command that proved that omp.h is indeed available > in 4 locations: > > > /usr/local/Cellar/gcc/5.3.0/lib/gcc/5/gcc/x86_64-apple-darwin13.2.0/5.3.0/include/omp.h > > /usr/local/Cellar/gcc6/6-20160124/lib/gcc/6/gcc/x86_64-apple-darwin13.2.0/6.0.0/include/omp.h > /usr/local/lib/gcc/x86_64-apple-darwin13.0.0/4.8.2/include/omp.h > /usr/local/lib/gcc/x86_64-apple-darwin13.1.0/4.9.0/include/omp.h > _______________________________________________ > Rcpp-devel mailing list > Rcpp-devel@lists.r-forge.r-project.org > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
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