[Rcpp-devel] Linking code in src/ subfolders

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.



E.g.



I?m looking to go from:

src/
    |-> main.cpp

    |-> testA.cpp

    |-> testA.h

    |-> testB.cpp

    |-> testB.h



To a structure like:


src/
   |-> 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:

testfunction(2^(1:5))

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

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





Any suggestions would be appreciated.

Sincerely,


JJB