[Rd] free variable, built-in R functions

[Jiangtian Li]

Hi,

I have one question about built-in R functions. I am looking into
interprocedural analysis and since R supports "free variable", it would
become complicated if free variable is read inside a function. It is
uncommon and probably not good to read free variables when implementing R
functions. I suppose R built-in functions don't read free variables
(therefore don't depend on global variables). Could someone in the
development team confirm about that? Thank you very much.

Best regards,
Jiangtian

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[Rd] problem in linking to libR.so with R 2.5.0

[Jiangtian Li]

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 
#include 

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

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

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