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

[Peter Carbonetto]

Have you seen this note (from https://cran.r-project.org/bin/macosx/)?

Important: this release uses Clang 7.0.0 and GNU Fortran 6.1, neither of
which is supplied by Apple. If you wish to compile R packages from sources,
you will need to download and install those tools - see the tools
directory.

Peter Carbonetto
Computational Scientist, Statistics & Genetics,
Research Computing Center & Dept. of Human Genetics
University of Chicago

On Fri, May 3, 2019 at 9:36 AM Maxime Turgeon <maxime.turgeon using mail.mcgill.ca>
wrote:

> 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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