[Rcpp-devel] Rcpp C++11 on Windows

[Martyn Plummer]

On Wed, 2016-01-27 at 11:35 +0100, Peter Meissner wrote:
> Hey Listeners,
> 
> I am quite solid in R but a complete noob to C++ and Rcpp so please excuse  
> if do not get it right ...
> 
> My problem is that I would like to have a package using Rcpp AND using  
> C++11 features AND working on both Linux (Debian derivates) and Windows.  
> For Linux I seem to be on the right track and features like 'auto' and  
> 'iterators' do work. On Windows however it will not compile.
> 
> As far as I understand it, the main problem is that Rtools comes with a  
> compiler that simply does not support those features (g++ version 4.6.3).  
> Furthermore, I found that C++11 features are not CRAN compatible - right?

OK There are two issues here

Q1: Does CRAN accept C++11 code?
A1: Yes but you have to indicate that you are using C++11 rather than C
++98, which is still the default standard for CRAN packages. This is
described in the "Writing R Extensions" manual in section 1.2.4.

Q2: Are C++11 features available on Windows?
A2: Not yet. Release 4.6.3 includes limited support for C++11 features.
Again, the "Writing R Extensions" manual will give you more details,
with a link to a page describing what features are available. There are
plans to update the toolchain on Windows to 4.9.2. This will improve C
++11 support on windows but it will not be complete. The first
fully-compliant gcc release is 5.1. However, it is not sufficiently
stable on Windows.

Martyn

> Do I get it right so far? Can you give guidance on how best to proceed?  
> Should I get a newer g++/or-other compiler and make it the system default?  
> What are best or good working practices? Windows/Linux is a must and  
> system tweaks for other Windows users installing/building the package  
> should be minimal, though CRAN compliance would be only a minor extra.


> I hope I did not miss some obvious documentation or already existing  
> I-take-you-by-the-hand-blog-post.
> 
> 
> Best, Peter
> 
> 
> 
> 
> Compilation error:
> 
>    * installing to library 'C:/Users/Admin/Documents/R/win-library/3.2'
>    * installing *source* package 'spanmatcher' ...
>    g++ -m64 -std=c++0x -I"C:/PROGRA~1/R/R-32~1.3/include" -DNDEBUG     
> -I"C:/Users/Admin/Documents/R/win-library/3.2/Rcpp/include"  
> -I"d:/RCompile/r-compiling/local/local323/include"     -O2 -Wall   
> -mtune=core2 -c span_matcher_worker.cpp -o span_matcher_worker.o
>    ** libs
>    g++ -m64 -shared -s -static-libgcc -o spanmatcher.dll tmp.def  
> RcppExports.o span_matcher_worker.o  
> -Ld:/RCompile/r-compiling/local/local323/lib/x64  
> -Ld:/RCompile/r-compiling/local/local323/lib  
> -LC:/PROGRA~1/R/R-32~1.3/bin/x64 -lR
>    collect2: ld returned 148 exit status
>    no DLL was created
>    ERROR: compilation failed for package 'spanmatcher'
> 
> 
> My system:
> 
>    R version 3.2.3 (2015-12-10)
>    Platform: x86_64-w64-mingw32/x64 (64-bit)
>    Running under: Windows >= 8 x64 (build 9200)
> 
>    locale:
>    [1] LC_COLLATE=German_Germany.1252  LC_CTYPE=German_Germany.1252
>    [3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C
>    [5] LC_TIME=German_Germany.1252
> 
>    attached base packages:
>    [1] stats     graphics  grDevices utils     datasets  methods   base
> 
>    other attached packages:
>    [1] devtools_1.9.1 Rcpp_0.12.2
> 
>    loaded via a namespace (and not attached):
>    [1] tools_3.2.3
> 
> 

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