[Rcpp-devel] Linking code in src/ subfolders

Balamuta, James Joseph balamut2 at illinois.edu
Tue Mar 10 23:23:26 CET 2015

Greetings and Salutations All,

I'm trying to add structure to the src folder since the amount of files I have residing in the src directory could be better organized. Note: These files are made using RcppArmadillo.


I'm looking to go from:

    |-> main.cpp
    |-> testA.cpp
    |-> testA.h
    |-> testB.cpp
    |-> testB.h

To a structure like:

   |-> main.cpp
   |-> A
       |-> testA.cpp
       |-> testA.h
   |-> B
       |-> testB.cpp
       |-> testB.h

Each file has a function:
main.cpp => testfunction(x)
testA.cpp => testfunctionA(x)
testB.cpp => testfunctionB(x)

To illustrate the issue, I have two repositories

SrcDir: https://github.com/coatless/header_cpp_subdir_code
SubdirSrc: https://github.com/coatless/header_cpp_code

If I compile without trying to change the folder structure, the package is made and is able to use without issue.

However, when I attempt to change the folder structure, I was getting a compiler error that identifies with a linking issue:

main.o:main.cpp:(.text+0x650a): undefined reference to `testfunctionA(arma::Col<double> const&)'

I looked at CRANs documentation for a suggested fix and ended up trying to ensure a link by using the makevars file (see: http://cran.r-project.org/doc/manuals/r-release/R-exts.html#Using-Makevars)

I made the following changes:

The Makevars file update seemed to work as the package then compiled.
(Exact changes to Makevars.win: https://github.com/coatless/header_cpp_subdir_code/blob/master/src/Makevars.win )

Herein lies the issues:

1.        Any files I've written in the subdirectories are no longer exported to RcppExport.cpp even though they have a // [[Rcpp::export]] tag preceding the function declaration.

2.       When I try to call the function in main.cpp (testfunction(x)), I receive:


Error in .Call("SubdirSrc_testfunction", PACKAGE = "SubdirSrc", x) :

  "SubdirSrc_testfunction" not available for .Call() for package "SubdirSrc"

Any suggestions would be appreciated.


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