From: Ryan Tarpine <rtarpine@...>
Date: 2001-07-21T13:51:07+09:00
Subject: [ruby-talk:18238] Trouble with C extensions

I'm new to both Linux (I unfortunately abandoned BeOS) and Ruby, so I
might be overlooking something simple, but here's my problem.  I cannot
write even the simplest extension in C that I can load into a Ruby
program.  I started with a real program, but I've whittled it down to
these barebones:

My C source: test.c
--------------------
#include "ruby.h"
 
VALUE cTest;
void Init_Test()
{
    cTest = rb_define_class("Test", rb_cObject);
}

With this as my extconf.rb:
----------------------------
require 'mkmf'
create_makefile("testlib")

Testing with this Ruby source: test.rb
-------------------------------
require 'testlib'
puts "Hello world!"

When I execute "ruby test.rb" after (successful) making, I get
test.rb:1:in `require': (null) - ./testlib.so (LoadError)
        from test.rb:1

Running "ldd testlib.so" gives
        libc.so.6 => /lib/libc.so.6 (0x40011000)
        libgcc_s.so.1 => /usr/local/lib/libgcc_s.so.1 (0x40124000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x2aaaa000)
so the library seems ok.  What's going on?  I've tried Ruby 1.64 plus
the CVS sources I grabbed last night.  I've also tried both gcc 2.95.2
and 3.0.  No luck.

Thanks in advance,
Ryan