[Rcpp-devel] help packaging Rcpp modules

[Dirk Eddelbuettel]

Hi James,

On 8 May 2012 at 17:51, James Simone wrote:
| I have followed the Rcpp developer's recommendation that a package
| greatly simplifies using RCPP_MODULE wrappering. Unfortunately, I'm
| having difficulty building and checking even a simple package
| containing an Rcpp module. I have read previous posts on this topic
| but I did not find anything helpful. I must be overlooking something
| very simple, please help.

You did the right thing. 

Unfortunately, things are a little bit in flux right now as some of the
related 'module loading' code got changed recently, and not all pieces have
been put together right.  I am flipping back and forth between our current
SVN version and the most recent release 0.9.10, but I fear that 0.9.10 isn't
quite right with R 2.15.0.

To make matters worse, Romain appears to be mostly off email right now.

So I don't have an immediate fix.  Modules loading should get better with R
2.15.1 making it simpler than the zzz.R you have below -- but in the meantime
you may have to resort to non-Modules code for Rcpp.

Sorry,  Dirk

 
| The package check fails with this error:
| ** testing if installed package can be loaded
| Error : .onLoad failed in loadNamespace() for 'mod', details:
|    call: value[[3L]](cond)
|    error: failed to load module mod from package mod
| no binding for "norm"
| 
| The package skeleton was created with Rcpp.package.skeleton() to which
| I added a C++ source file and then edited files according to the
| 'Read-and-delete-me' file.
| 
| Here are my build and check steps:
| 
| $ R CMD build mod
| * checking for file `mod/DESCRIPTION' ... OK
| * preparing `mod':
| * checking DESCRIPTION meta-information ... OK
| * cleaning src
| * checking for LF line-endings in source and make files
| * checking for empty or unneeded directories
| * building `mod_1.0.tar.gz'
| 
| $ R CMD check mod
| * using log directory '/home/simone/R/Rcpp/module/mod.Rcheck'
| * using R version 2.13.1 (2011-07-08)
| * using platform: x86_64-pc-linux-gnu (64-bit)
| * using session charset: UTF-8
| * checking for file 'mod/DESCRIPTION' ... OK
| * checking extension type ... Package
| * this is package 'mod' version '1.0'
| * checking package name space information ... OK
| * checking package dependencies ... OK
| * checking if this is a source package ... OK
| * checking for executable files ... OK
| * checking whether package 'mod' can be installed ... ERROR
| Installation failed.
| 
| The package skeleton was created with Rcpp.package.skeleton().
| 
| Here is the module directory structure:
| $ /bin/ls -R mod
| mod:
| DESCRIPTION  man  NAMESPACE  R  Read-and-delete-me  src
| 
| mod/man:
| mod-package.Rd
| 
| mod/R:
| zzz.R
| 
| mod/src:
| Makevars  Makevars.win  rcpp_module.cpp
| 
| Here are the key files:
| 
| $ cat mod/NAMESPACE
| useDynLib(mod)
| exportPattern("^[[:alpha:]]+")
| import( Rcpp )
| 
| $ cat mod/R/zzz.R
| 
| .onLoad <- function(libname, pkgname) {
|      require("methods", character=TRUE, quietly=FALSE)
|      loadRcppModules()
| }
| 
| $ cat mod/src/rcpp_module.cpp
| #include <math.h>
| #include <Rcpp.h>
| 
| double norm( double x, double y ) {
|    return sqrt( x*x + y*y );
| }
| 
| RCPP_MODULE(mod) {
|    using namespace Rcpp;
|    function( "norm", &norm );
| }
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