[R-pkg-devel] clang: error: unsupported option '-fopenmp'

[Maxime Turgeon]

Hi Spencer,

I remember having a similar error a few years ago when trying to compile R (and its recommended packages, e.g. mgcv) from source. I was using clang as a compiler (this is what Hadley recommends in his book "R packages"), and I solved the issue by going back to g++. This can be done in your ".R/Makevars" file. Alternatively, you could switch to a version of clang that supports OpenMP.

Best,
Max
________________________________
From: R-package-devel <r-package-devel-bounces using r-project.org> on behalf of Spencer Graves <spencer.graves using effectivedefense.org>
Sent: May 3, 2019 10:18 AM
To: List r-package-devel
Subject: [R-pkg-devel] clang: error: unsupported option '-fopenmp'

Hello, All:


       I'm getting "clang: error: unsupported option '-fopenmp'" when
trying to build "https://github.com/helske/bssm" under macOS 10.14.14
with R 3.6.0;  see below.


       What do you suggest?


       Thanks,
       Spencer Graves


p.s.  I assume I have to install compiler(s).  However, I've so far been
unable to find instructions that are sufficiently current to convince me
I might not do more harm than good following them.


 > R CMD build bssm
* checking for file �bssm/DESCRIPTION� ... OK
* preparing �bssm�:
* checking DESCRIPTION meta-information ... OK
* cleaning src
* installing the package to build vignettes
       -----------------------------------
* installing *source* package �bssm� ...
** using staged installation
** libs
clang++ -std=gnu++11
-I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG
-I"/Library/Frameworks/R.framework/Versions/3.6/Resources/library/BH/include"
-I"/Library/Frameworks/R.framework/Versions/3.6/Resources/library/Rcpp/include"
-I"/Library/Frameworks/R.framework/Versions/3.6/Resources/library/RcppArmadillo/include"
-I"/Library/Frameworks/R.framework/Versions/3.6/Resources/library/ramcmc/include"
-I"/Library/Frameworks/R.framework/Versions/3.6/Resources/library/sitmo/include"
-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
-I/usr/local/include -fopenmp -fPIC  -Wall -g -O2  -c R_approx.cpp -o
R_approx.o
clang: error: unsupported option '-fopenmp'
make: *** [R_approx.o] Error 1
ERROR: compilation failed for package �bssm�
* removing
�/private/var/folders/mh/mrm_14nx19g13lsnj9zmvwjr0000gn/T/RtmppA2gBg/Rinst24427c5cbfeb/bssm�
       -----------------------------------
ERROR: package installation failed

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