From: Lyle Johnson <ljohnson@...>
Date: 2002-03-28T03:09:47+09:00
Subject: Re: Ruby SWIG problems

> I've been trying to use Ruby SWIG, but been having limited success.
> Currently I'm using SWIG 1.3.11, and Ruby 1.7.2 ('stable' ruby versions
have
> given me even less success than below). Here's the scoop:

<... file listings snipped ...>

> ...and i run the following commands, all via cygwin (Ruby & SWIG both also
> compiled using cygwin):
>
> $ swig -c++ -ruby example.i
> $ gcc -c example.cxx
> $ gcc -c example_wrap.cxx -I/usr/local/lib/ruby/1.6/i386-cygwin
> $ gcc -shared example.o example_wrap.o -o example.so -lcygwin-ruby17
>
> ... all with no errors. Now when i try and use my new module 'example' - i
> get this:
>
> $ irb
> TypeError: wrong argument type Fixnum (expected Class)
>         from (irb):1:in `require'
>         from (irb):1
> irb(main):002:0>
>
> Anyone have any ideas? I've tried using different class definitions, etc
etc
> but with no joy.

You need to compile example_wrap.cxx (i.e. the SWIG-generated wrapper code)
with the -DUSEIMPORTLIB flag, i.e.

    $ gcc -DUSEIMPORTLIB -c
example_wrap.cxx -I/usr/local/lib/1.6/i386-cygwin

This, by the way, has nothing to do with SWIG per se; it's just a
requirement for compiling code that you're going to link against the Ruby
DLL.

On a side note, if you have the time you may also wish to check the
development version of SWIG out from CVS (see http://www.swig.org/cvs.html
for instructions on how to do so). We've made a number of improvements and
bug fixes for the SWIG Ruby module since the SWIG 1.3.11 release.

Hope this helps,

Lyle