[R] Rcpp cpp11 and R CMD build

[Charles Determan]

Hi Edwin,

If you look at the build output you will notice that the C++11 compiler
flag is not being used.  I just created a small package using Rcpp11 and
your function and it worked without a problem.  I can't give you a specific
reason without seeing your package but there are some possibilities I would
guess right away.

1. Make sure you are 'LinkingTo' Rcpp11 in your DESCRIPTION
2. Unless you are using some custom Makevars file, you should set
'SystemRequirements: C++11' in your DESCRIPTION

Charles

On Wed, Jun 24, 2015 at 10:07 AM, Edwin van Leeuwen <edwinvanl at gmail.com>
wrote:

> Hi all,
>
> I've just started using Rcpp and am trying to get cpp11 support working. As
> suggested I added [[Rcpp:plugins(cpp11)]] to my source file and a test
> function:
> // [[Rcpp::export]]
> int useCpp11() {
>   auto x = 10;
>   return x;
> }
>
> This works fine when using:
> sourceCpp(filename)
> from R, but I would like to be able to compile the package from the command
> line.
> R CMD build mypackage
> fails with the following error:
> R CMD build ../fluEvidenceSynthesis
> * checking for file ‘../fluEvidenceSynthesis/DESCRIPTION’ ... OK
> * preparing ‘fluEvidenceSynthesis’:
> * checking DESCRIPTION meta-information ... OK
> * cleaning src
> * installing the package to process help pages
>       -----------------------------------
> * installing *source* package ‘fluEvidenceSynthesis’ ...
> ** libs
> g++ -I/usr/share/R/include -DNDEBUG
> -I"/home/edwin/R/x86_64-pc-linux-gnu-library/3.2/Rcpp/include"
> -I"/home/edwin/R/x86_64-pc-linux-gnu-library/3.2/BH/include"   -fpic  -g
> -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat
> -Werror=format-security -D_FORTIFY_SOURCE=2 -g  -c RcppExports.cpp -o
> RcppExports.o
> g++ -I/usr/share/R/include -DNDEBUG
> -I"/home/edwin/R/x86_64-pc-linux-gnu-library/3.2/Rcpp/include"
> -I"/home/edwin/R/x86_64-pc-linux-gnu-library/3.2/BH/include"   -fpic  -g
> -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat
> -Werror=format-security -D_FORTIFY_SOURCE=2 -g  -c rcpp_hello_world.cpp -o
> rcpp_hello_world.o
> rcpp_hello_world.cpp: In function ‘int useCpp11()’:
> rcpp_hello_world.cpp:33:10: error: ‘x’ does not name a type
>      auto x = 10;
>           ^
> rcpp_hello_world.cpp:34:12: error: ‘x’ was not declared in this scope
>      return x;
>             ^
> make: *** [rcpp_hello_world.o] Error 1
> ERROR: compilation failed for package ‘fluEvidenceSynthesis’
> * removing ‘/tmp/RtmpWdUduu/Rinst2b601aa285e9/fluEvidenceSynthesis’
>       -----------------------------------
> ERROR: package installation failed
>
>
> Any help appreciated.
>
> Cheers, Edwin
>
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>
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