[Rcpp-devel] Segmentation faults

[Balamuta, James Joseph]

Greetings and Salutations Brook, 

The segfault is related to `int main() {}`. There is no need to use `int main() {}` unless you want to make this standalone in which case you want to use RInside to embed R within a C++ application.

Rcpp enables embedding C++ within R. So, R already is using its own `int main() {}`. Modifying code to the following should work:

In C++

test_fun.cpp

    #include <Rcpp.h>

    // [[Rcpp::plugins(cpp11)]]
    
    // [[Rcpp::export]]
    void test_fun()
    {
      auto i = Rcpp::IntegerVector::create(1,2);
      Rcpp::Rcout << "Hello World!" << std::endl;
    }

In R

Rcpp::sourceCpp("path/to/test_fun.cpp")
test_fun()
# Hello World! 

For other examples, consider looking at examples from the introduction paper: 
https://cran.r-project.org/web/packages/Rcpp/vignettes/Rcpp-introduction.pdf 

Sincerely,

JJB

On 12/6/19, 3:48 PM, "Rcpp-devel on behalf of Brook Milligan" <rcpp-devel-bounces at lists.r-forge.r-project.org on behalf of brook at nmsu.edu> wrote:

    I am trying to build some simple test cases of Rcpp.  One of the simplest I can think of is below.
    
    #include <Rcpp.h>
    
    int main ()
    {
      auto i = Rcpp::IntegerVector::create(1,2);
    }
    
    This compiles fine and links against libR, but segmentation faults when run.  My test system is a Mac with clang++.
    
    Is there an obvious reason this should not work?
    
    Cheers,
    Brook
    
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