Hi,
I want to make use of some C routines from other packages to write extensions
in C.
In "Writing R Extensions", it says there is an experimental interface to
support this in (or from ?) R 2.4.0.
I had a dummy library containing src/dummy.cpp and R/zzz.R:
====== src/dummy.cpp ====
#include <R.h>
#include <Rinternals.h>
#include <R_ext/Rdynload.h>
extern "C"
{
void dummy(int *a, int *b)
{
printf("dummy\n");
}
}
void R_init_dummy(DllInfo *dll)
{
R_RegisterCCallable("dummy", "dummy", (DL_FUNC)dummy);
}
====== R/zzz.R =========
.First.lib <- function(lib, pkg) {
library.dynam("dummy", pkg, lib)
}
======================
I can compile this using R 2.5.0 under Linux.
But I got the following error when I tried to load the library
>library(dummy):
Error in dyn.load(x, as.logical(local), as.logical(now)) :
unable to load shared library
'/homes/ychen/Rlibs/dummy/libs/dummy.so':
/homes/ychen/Rlibs/dummy/libs/dummy.so: undefined symbol:
_Z19R_RegisterCCallablePcS_PFPvvE
Error in library(dummy) : .First.lib failed for 'dummy'
Can anyone help me out?
Thanks!
Alex
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