[R] Compiling C++ package source: linking problem?

[Alet Roux]

Dear All

I'm currently developing a package for R (1.9.0) on Win32, with C++ source code.
Having followed the instructions in readme.packages, my code compiles fine with
R CMD SHLIB (as well as R CMD check) ... until I start using the internal R
functions. 

(Interesting: Rprintf seems to be the exception.) For instance, the following
code compiles fine:

#include <R.h>
#include <Rdefines.h>
...
SEXP whatever (SEXP model)
{
	Rprintf ("Hello, here I am!\n");
        return model;
}

However, the following doesn't compile at all:

#include <R.h>
#include <Rdefines.h>
...
SEXP whatever (SEXP model)
{
	SEXP anotherModel;
	PROTECT(anotherModel = NEW_NUMERIC(4));
	UNPROTECT(1);
        return anotherModel;
}

An example of compiler feedback from R CMD SHLIB (I have mingw 3.1.0):
...: undefined reference to 'Rf_allocVector(unsigned,int)'
...: undefined reference to 'Rf_protect(SEXPREC*)'
...: undefined reference to 'Rf_unprotect(int)'

Can anybody tell me what the matter is? Did I miss something?

My PATH variable is as follows:

C:\R\tools;C:\Perl\bin\;C:\mingw\bin;c:\R\rw1090\bin;C:\Program
Files\MiKTeX\miktex\bin;...;C:\Program Files\HTML Help Workshop

I should mention that I'm a complete R and C++ newbie; any help would be
sincerely appreciated.

Regards

Alet

-------------------------------------
Alet Roux
Department of Mathematics
University of Hull
Kingston upon Hull
HU6 7RX
United Kingdom
URL: http://www.hull.ac.uk/php/mapar/
Tel: +44 (1482) 466463
Fax: +44 (1482) 466218