g++ errors when trying to compile c++11 with Rcpp

Question

SYSTEM SPEC:

• OS - Mac OS X 10.6.8 (Snow Leopard)
• g++ - Macports gcc 4.8.1_2+universal

Answer 1

If you don't want to fix up your path you can set the PKG_CXXFLAGS environment variable just prior to compiling.

     export PKG_CXXFLAGS='`Rscript -e "Rcpp:::CxxFlags()"` -std=c++11'

For example:

In R

#generate the bare Rcpp package as usual
library(Rcpp)
Rcpp.package.skeleton("Foo",
                      example_code=FALSE,
                      attributes=TRUE,
                      cpp_files=c("./Foo_R_wrapper.cpp", "./Foo.h", "/Foo.cpp")
                     )    

and in Bash

#tell the compiler to use C++11
export PKG_CXXFLAGS='`Rscript -e "Rcpp:::CxxFlags()"` -std=c++11'

#compile as usual
cd ./Foo/;
R -e 'Rcpp::compileAttributes(".",verbose=TRUE)';
cd ..;

R CMD build Foo;
#ensure that there are no bugs
R CMD check Foo;

where Foo_R_wrapper.cpp wraps a C++ function FooBar defined and implemented in Foo.h and Foo.cpp respectively.

Foo_R_wrapper.cpp could contain the following:

#include                                    

#include "Foo.h"                                    

// [[Rcpp::export]]                                 
SEXP FooBar(SEXP baa)
{                                                   
    Rcpp::NumericVector baa_vec(baa)
    //Do something from Foo.h (to baa_vec?)
    ...
    //etc
    return baa_vec;
}