From: Daniel Berger <djberg96@...>
Date: 2006-08-02T09:10:05+09:00
Subject: Static functions, extensions, linkage

Hi,

How do you get at a static function from within a C extension?  I tried
this snippet where I attempt to use flo_plus from numeric.c:

/* foo.c */
#include <ruby.h>

extern VALUE flo_plus(VALUE, VALUE);

static VALUE foo_test(VALUE x, VALUE y){
   return flo_plus(x, y);
}

void Init_foo(){
   VALUE cFoo = rb_define_class("Foo", rb_cObject);
   rb_define_method(cFoo, "test", foo_test, 2);
}

# test.rb
$:unshift Dir.pwd
require 'foo'
f = Foo.new
f.test

This result is:

ruby: symbol lookup error:
/home/djberge/programming/ruby/extensions/foo.so: undefined symbol:
flo_plus

I tried linking explicitly against -lruby but that didn't help.

Regards,

Dan