Hi James and Kevin,
Thank you very much for the advices (I'll try James' directions shortly).
But I have already installed clang-omp via
$ brew install clang-omp
The compiler is available at /usr/local/Library/Formula/clang-omp.rb
Can I ask you for some directions as to how to configure clang-omp with RStudio
(if possible), i.e. how to make R recognize clang-omp?
Thank you in advance.
Anguel
-----Original Message-----
From: Kevin Thornton <[email protected]>
To: [email protected] <[email protected]>
Sent: Mon, Mar 14, 2016 11:33 am
Subject: Re: [Rcpp-devel] fatal error: 'omp.h' file not found
One may also use clang-omp from Homebrew if you wish to still use clang on OS
X, but have OpenMP.
--Kevin
On Mon, Mar 14, 2016 at 9:31 AM Balamuta, James Joseph <[email protected]>
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: [email protected]
[mailto:[email protected]]On Behalf Of
[email protected]
Sent: Monday, March 14, 2016 10:01 AM
To: [email protected]
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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