[Rcpp-devel] large number of warnings for simple use of Rcpp

[Guillaume Blanchet]

Hi ! 

Great thanks ! 

In the mean time, what do you suggest I can do if I want to work with Rcpp ? Or can something be done to the Makevars or is this problem running deeper ?

Have a good day ! 

Guillaume

> Le 2 nov. 2015 à 13:58, Kevin Ushey <kevinushey at gmail.com> a écrit :
> 
> Hi Guillaume,
> 
> Compiling with the Makevars you provided, I see a number of warnings
> related to sign conversion and loss of integer precision (due to the
> use of `-Wconversion` in the Makevars).
> 
> I'll add an issue on the GitHub issue tracker just so we don't lose sight of it.
> 
> Thanks,
> Kevin
> 
> On Mon, Nov 2, 2015 at 10:48 AM, Guillaume Blanchet
> <gblanchet.list at gmail.com> wrote:
>> Hi !
>> 
>> I apologie in advance if this question has already been answered but I have yet to find a solution to my problem.
>> 
>> I recently started to learn Rcpp using the book « Seamless R and C++ Integration with Rcpp » by Dirk Eddelbuettel.
>> 
>> Using the Fibonacci C code from the book, I tried to reproduce the example to get a feeling of how to work with Rcpp. More precisely, I wrote the following C code in a file that I called  « fibonacci.cpp ».
>> 
>> #include <Rcpp.h>
>> using namespace Rcpp;
>> 
>> //[[Rcpp::export]]
>> int fibonacci(const int x) {
>>        if(x < 2){
>>                return(x);
>>        }else{
>>                return fibonacci(x-1)+fibonacci(x-2);
>>        }
>> }
>> 
>> Following, I called this file using the following command line:
>> 
>> sourceCpp("fibonacci.cpp")
>> 
>> What I get in return is a series of 80 warnings. Although, these warning may be helpful to answer this question, to keep this message concise I will not attached them here. However, if you feel they maybe helpful, let me know and I will send them along.
>> 
>> Note that I am currently working on a Macbook Pro with the new OS (El Capitan). Following the advice given on the CRAN, I organized the Makevar file using clang as follow:
>> 
>> CC=clang
>> CXX=clang++
>> CFLAGS=-mtune=native -g -O2 -Wall -pedantic -Wconversion
>> CXXFLAGS=-mtune=native -g -O2 -Wall -pedantic -Wconversion
>> FLIBS=-lgfortran
>> 
>> Any reasons, why I get so many warnings ?
>> 
>> Thanks in advance for your answer !
>> 
>> Have a good day !
>> 
>> Guillaume
>> 
>> 
>> 
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