From: Ryan Davis <ryand-ruby@...>
Date: 2005-05-04T17:35:06+09:00
Subject: Re: C Extensions using MingW (invalid address LoadError)


On May 3, 2005, at 8:39 PM, Kian Wright wrote:

> I've had some real trouble getting my first C extensions for Ruby to 
> link
> correctly, and now they won't load into Ruby properly.
>
> 1) How to correctly compile and link extensions using the mingw gcc
> compiler? [...]

You might want to take a look at RubyInline. Experiment with simple 
stuff just to get a feel for it. When you want, run w/ ruby -d to see 
the commands and flags it is using to compile and link the inlined 
code.

Here is a simple example I wrote earlier today to help a friend out 
with their code. They were coding in ObjC (really just plain C at that 
stage) and having problems. Popping their example into inline made all 
compile and link issues just melt away. I should note that I do not 
develop on windoze and we have had some issues in the past with mingw, 
but those appear to be addressed and I haven't heard about anything 
similar in a while.

#!/usr/local/bin/ruby -w

require 'inline'

class Example

   inline(:C) do |builder|

     builder.c <<-'END'
     void myrand() {
       unsigned int i;
       srandom(0);
       for (i = 0; i < 100; i++) {
         printf("%.17Lf \t", (random() / (double) LONG_MAX ));
       }
       puts("");
     }
     END

   end

end

Example.new.myrand

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