[Rcpp-devel] clang-omp and clang++ -fopenmp compiler (OS X)

[Yue Li]

Thank you Qiang! That works.

Yue

> On Apr 5, 2016, at 10:24 AM, Qiang Kou <qkou at umail.iu.edu> wrote:
> 
> Hi, Li,
> 
> Please create the file "~/.R/Makevars" and put the following content in it
> 
> CC=clang-omp
> CXX=clang-omp++
> CFLAGS += -O3 -Wall -pipe -pedantic
> CXXFLAGS += -O3 -Wall -pipe -Wno-unused -pedantic -fopenmp
> 
> You can add or change flags in this file.
> 
> Best,
> 
> KK
> 
> On Tue, Apr 5, 2016 at 10:14 AM, Yue Li <gorillayue at gmail.com <mailto:gorillayue at gmail.com>> wrote:
> Dear List,
> 
> I’m new to openmp and wonder if anyone know how to add -fopenmp to clang++ such that it can compile successfully without error using sourceCpp.
> 
> Using the dmvnorm_arma as example (http://gallery.rcpp.org/articles/dmvnorm_arma/ <http://gallery.rcpp.org/articles/dmvnorm_arma/>):
> 
> I got the following compiling error when do this:
> 
> > Rcpp::sourceCpp('dmvnrm_arma_mc.cpp')
> dmvnrm_arma_mc.cpp:2:10: fatal error: 'omp.h' file not found
> #include <omp.h>
>          ^
> 1 error generated.
> make: *** [dmvnrm_arma_mc.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/mike/Desktop"    -fPIC  -Wall -mtune=core2 -g -O2  -c dmvnrm_arma_mc.cpp -o dmvnrm_arma_mc.o
> Error in Rcpp::sourceCpp("dmvnrm_arma_mc.cpp") : 
>   Error 1 occurred building shared library.
> 
> 
> After installing clang-omp, i can compile the ‘dmvnrm_arma_mc.cpp’ code without error using clang-omp compiler instead of clang++. But in order to use the compiled code in R environment, i still need to do the sourcing and linking like what sourceCpp automatically accomplishes.
> 
> So I wonder if it’s possible to either specify c++ compiler in sourceCpp or somehow add the ‘-fopenmp’ flag 
> 
> 
> Thanks in advance,
> Yue
> 
> 
> 
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> 
> 
> 
> -- 
> Qiang Kou
> qkou at umail.iu.edu <mailto:qkou at umail.iu.edu>
> School of Informatics and Computing, Indiana University
> 

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