From: ts <decoux@...>
Date: 2003-05-22T21:12:40+09:00
Subject: Re: OT: pickaxe chap 17 and gcc (ruby/c)

>>>>> "R" == Rasputin  <rasputin@shrike.mine.nu> writes:

R> rasputin@shrike cruby$ gcc -c -o Test.o -I \
R> /usr/local/lib/ruby/1.6/i386-freebsd4/ simple.c

 Well, the example is

svg% cat Test.c
#include <ruby.h>

static VALUE
t_init(VALUE self)
{
    rb_iv_set(self, "@arr", rb_ary_new());
    return self;
}

static VALUE
t_add(VALUE self, VALUE anObject)
{
    VALUE arr = rb_iv_get(self, "@arr");
    rb_ary_push(arr, anObject);
    return arr;
}

void Init_Test()
{
    VALUE cTest = rb_define_class("Test", rb_cObject);
    rb_define_method(cTest, "initialize", t_init, 0);
    rb_define_method(cTest, "add", t_add, 1);
}
svg% 

 The best after is to create a file extconf.rb

svg% cat extconf.rb 
#!/usr/bin/ruby
require 'mkmf'
create_makefile('Test')
svg% 

 Then

svg% ruby extconf.rb 
creating Makefile
svg% 

svg% make
gcc -fPIC -g -O2 -I. -I/usr/local/lib/ruby/1.8/i686-linux -I/usr/local/lib/ruby/1.8/i686-linux -I.   -c Test.c
gcc -shared -rdynamic   -L"/usr/local/lib" -o Test.so Test.o  -ldl -lcrypt -lm  -lc
svg% 

 and finally you can use it :

svg% ruby -rTest -e 't = Test.new; t.add("Bill Chase"); p t'
#<Test:0x4009a0f0 @arr=["Bill Chase"]>
svg% 


 It's important that the name of the extension ('Test') is the same than
 the name of the init function ('Init_Test')



Guy Decoux