From: Steve <steve@...>
Date: 2005-08-31T21:21:24+09:00
Subject: Re: Compiling a Ruby extension

You can't use mingw to compile your extensions. You need to use the MS 
compiler. You can either get a hold of Visual Studio.Net or follow these 
instructios to cobble together the tools that MS release for free in 
about 5 different packages. http://www.rubygarden.org/ruby?WindowsCompiler

Axel wrote:
> Hello!
> 
> I am trying to manually compile a tiny Ruby extension, but finally run
> into a problem. I wonder if anyone can give me a hint on what's wrong?
> 
> The code for the extension:
> 
> #include <stdio.h>
> #include "ruby.h"
> __declspec(dllexport) void Init_MyExt();
> static VALUE initialize(VALUE self);
> static VALUE perform(VALUE self);
> VALUE cMyExt;
> void Init_MyExt() {
>   cMyExt = rb_define_class("MyExt", rb_cObject);
>   rb_define_method(cMyExt, "initialize", initialize, 0);
>   rb_define_method(cMyExt, "perform", perform, 0);
> }
> static VALUE initialize(VALUE self) {
>   return self;
> }
> static VALUE perform(VALUE self) {
>   puts("Here is the C code!");
>   return self;
> }
> 
> My setup: Windows XP, Ruby One-Click Installer 1.8.2-15, MinGW 3.4.2.
> 
> Now I compile the code above into a DLL:
> 
> gcc -c -IC:\ruby\lib\ruby\1.8\i386-mswin32 myext.c
> gcc -shared -o MyExt.dll -Wl,-s myext.o C:\ruby\lib\msvcrt-ruby18.lib
> 
> Now I try to call this DLL via the following client:
> 
> require 'MyExt'
> e = MyExt.new
> e.perform
> 
> Unfortunatly, this results in the following error message:
> 
> ./MyExt.dll: wrong argument type Fixnum (expected Class) (TypeError)
>         from
> c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:18:in
> `require'
>         from C:/temp/rubyext/test.rb:1
> 
> Any ideas?
>