IOStuff.h is not a public header, and neither are the entry points within
it. See 'Writing R Extensions'. One is in the category:
Entry points that are where possible (Windows and some modern Unix
compilers/loaders when using @R{} as a shared library) not exported.
On Wed, 7 Nov 2007, Jiangtian Li wrote:
> Dear All,
>
> I tried to write a C++ program that uses R internals and I encounter
> "undefined reference" error when linking to libR.so. Here is an small
> example of the program test.cpp:
>
> extern "C" {
> #include <config.h>
> #include <IOStuff.h>
>
> int main(int argc, char** argv)
> {
> R_IoBufferInit(&R_ConsoleIob);
> return 0;
> }
> }
>
> I built it using:
> g++ -o test -I/dir/to/R-2.5.0/src/include -L/dir/to/R-2.5.0/lib/R/lib -lR
> test.cpp
You need -I/dir/to/R-2.5.0/include to get the public headers.
> and I got the error message:
>
> /tmp/cc4zxrqh.o(.text+0x20): In function `main':
> test.cpp: undefined reference to `R_ConsoleIob'
> /tmp/cc4zxrqh.o(.text+0x25):test.cpp: undefined reference to `R_IoBufferInit'
> collect2: ld returned 1 exit status
>
> I installed R 2.5.0 on Fedora Core 4 with gcc 4.0.2 and configured with
> --prefix=/dir/to/R-2.5.0 --enable-R-shlib
>
> I did that with R 2.2.1 and can build without problem. Any suggestion on
> how to link to libR.so in later R versions? Your help is very appreciated.
>
> Best regards,
> Jiangtian
>
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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