Rcpp - sourceCpp - undefined symbol

Question

I\'m using Rcpp to get self-written C++ into R.

I have the 3 follwing C++ files

header.h

#include 
int x();


        

Answer 1

I really do not understand why some folks are so opposed to creating packages.

Here is a quick copy and paste of a screen full of output corresponding to five commands giving me exactly what you wanted with your exact input files.

Five simple steps.

Step One: Create a placeholder package for Rcpp

edd@rob:/tmp/flappix$ Rscript -e 'Rcpp::Rcpp.package.skeleton("stubborn")' 
Creating directories ...                                                                                                                                                                                                   
Creating DESCRIPTION ...                                                                                     
Creating NAMESPACE ...                                 
Creating Read-and-delete-me ...                          
Saving functions and data ...                          
Making help files ...                                                                                                                                                                                                      
Done.                                                                                                        
Further steps are described in './stubborn/Read-and-delete-me'.

Adding Rcpp settings                                                         
 >> added Imports: Rcpp                                                                                                                                                                                                    
 >> added LinkingTo: Rcpp                                                                                    
 >> added useDynLib directive to NAMESPACE            
 >> added importFrom(Rcpp, evalCpp) directive to NAMESPACE
 >> added example src file using Rcpp attributes      
 >> added Rd file for rcpp_hello_world                                                                                                                                                                                     
 >> compiled Rcpp attributes                                                                                 
 edd@rob:/tmp/flappix$

Step Two: Copy your exact three sources files

edd@rob:/tmp/flappix$ cp -vax header.h def.cpp call.cpp stubborn/src/                                        
'header.h' -> 'stubborn/src/header.h'                 
'def.cpp' -> 'stubborn/src/def.cpp'                      
'call.cpp' -> 'stubborn/src/call.cpp'  
edd@rob:/tmp/flappix$

Step Three: Run compileAttributes() to update the exports

edd@rob:/tmp/flappix$ cd stubborn/                         
edd@rob:/tmp/flappix/stubborn$ Rscript -e 'Rcpp::compileAttributes()'
edd@rob:/tmp/flappix$

Step Four: Build the package

edd@rob:/tmp/flappix/stubborn$ R CMD build .             
* checking for file ‘./DESCRIPTION’ ... OK                                                                   
* preparing ‘stubborn’:                                                                                      
* checking DESCRIPTION meta-information ... OK        
* cleaning src                                                                           
* installing the package to process help pages        
* saving partial Rd database                                                                                 
* cleaning src                                        
* checking for LF line-endings in source and make files and shell scripts                                    
* checking for empty or unneeded directories          
* building ‘stubborn_1.0.tar.gz’                                                                             
edd@rob:/tmp/flappix$                                                          

Step Five: Install it

edd@rob:/tmp/flappix/stubborn$ R CMD INSTALL stubborn_1.0.tar.gz
* installing to library ‘/usr/local/lib/R/site-library’
* installing *source* package ‘stubborn’ ...                                                                 
** libs                                               
ccache g++ -I/usr/share/R/include -DNDEBUG  -I"/usr/local/lib/R/site-library/Rcpp/include"    -fpic  -g -O3 -Wall -pipe  -Wno-misleading-indentation -Wno-unused -Wno-ignored-attributes -Wno-deprecated-declarations -marc
h=native -c RcppExports.cpp -o RcppExports.o          
ccache g++ -I/usr/share/R/include -DNDEBUG  -I"/usr/local/lib/R/site-library/Rcpp/include"    -fpic  -g -O3 -Wall -pipe  -Wno-misleading-indentation -Wno-unused -Wno-ignored-attributes -Wno-deprecated-declarations -marc
h=native -c call.cpp -o call.o                                                                 
ccache g++ -I/usr/share/R/include -DNDEBUG  -I"/usr/local/lib/R/site-library/Rcpp/include"    -fpic  -g -O3 -Wall -pipe  -Wno-misleading-indentation -Wno-unused -Wno-ignored-attributes -Wno-deprecated-declarations -marc
h=native -c def.cpp -o def.o                                                          
ccache g++ -I/usr/share/R/include -DNDEBUG  -I"/usr/local/lib/R/site-library/Rcpp/include"    -fpic  -g -O3 -Wall -pipe  -Wno-misleading-indentation -Wno-unused -Wno-ignored-attributes -Wno-deprecated-declarations -marc
h=native -c rcpp_hello_world.cpp -o rcpp_hello_world.o   
ccache g++ -Wl,-S -shared -L/usr/lib/R/lib -Wl,-Bsymbolic-functions -Wl,-z,relro -o stubborn.so RcppExports.o call.o def.o rcpp_hello_world.o -L/usr/lib/R/lib -lR
installing to /usr/local/lib/R/site-library/stubborn/libs                  
** R                                                                                                         
** preparing package for lazy loading                    
** help                                                          
*** installing help indices                           
** building package indices                                                                                  
** testing if installed package can be loaded
* DONE (stubborn)
edd@rob:/tmp/flappix/stubborn$ 

And it obviously loads as it automagically links against all source files in src/.

Answer 2

sourceCpp is meant for single translation units that are compiled and linked, which normally implies individual C++ files. You could use #include def.cpp, but I find that rather odd and would require using a different file than in the package source. However, I am really wondering why you want to source the file when you already build a package out of the set of files.