[Rcpp-devel] fatal error: 'omp.h' file not found

[Kevin Thornton]

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 <
balamut2 at 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-bounces at lists.r-forge.r-project.org [mailto:
> rcpp-devel-bounces at lists.r-forge.r-project.org] *On Behalf Of *
> aakremena at aol.com
> *Sent:* Monday, March 14, 2016 10:01 AM
> *To:* rcpp-devel at 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
> _______________________________________________
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