chassalasociere chassalasociere - 1 month ago 20
R Question

Rcpp plugin for C++11 not working since update to R 3.4.0

Since I updated R to the new version 3.4.0, the Rcpp plugin to enable C++11 does not seem to work properly. (Note that this is a different situation as reported here http://r.789695.n4.nabble.com/R-3-4-has-broken-C-11-support-td4732692.html)

I have C++ files requiring C++11 standard that I compile in R via Rcpp using the command

Rcpp::sourceCpp(foo.cpp)
. The R default standard is C++98 but I could change that by adding the following command in my C++ file

// [[Rcpp::plugins("cpp11")]]


This does not work anymore with the new version of R 3.4.0, my compiler use the default standard (C++98) instead of C++11, despite the plugin. It used to work with previous version of R.

My solution for the moment is to set an environment variable for my R session:
Sys.setenv("PKG_CXXFLAGS"="-std=c++11")


Here is the configuration I use in R:
sessionInfo()

R version 3.4.0 (2017-04-21)
Platform: x86_64-suse-linux-gnu (64-bit)
Running under: openSUSE Leap 42.2

Matrix products: default
BLAS: /usr/lib64/R/lib/libRblas.so
LAPACK: /usr/lib64/R/lib/libRlapack.so
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8

[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 LC_PAPER=en_US.UTF-8 LC_NAME=C

[9] LC_ADDRESS=C LC_TELEPHONE=C LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats graphics grDevices utils datasets methods base

loaded via a namespace (and not attached):
[1] compiler_3.4.0 rsconnect_0.4.3 tools_3.4.0


I use the Rcpp package version 0.12.1.0.
My compiler is the following:
~$ g++ --version | head -n1
g++ (SUSE Linux) 4.8.5


Am I missing something? Has anyone else encountered the same issue?

Answer Source

That was reported yesterday at the GitHub issue tracker in #683 and already closed in pull request #684 which has now been merged.

So just upgrade to the master branch, or set the env.var manually for now. It is an upstream R change that broke this with no provision for backwards compatibility.