From: Dennis Newbold <dennisn@...>
Date: 2002-04-04T00:20:14+09:00
Subject: Re: Request for Advice -- Undefined Symbol

Wow, fast response.  Thanks alot, Sean.  I'll give that a try.

Dennis

On Wed, 3 Apr 2002, Sean Middleditch wrote:

> You need to make the executable export it symbols (-dynamic flag to gcc,
> I think).  The extension is looking for the symbol in Ruby, which you
> said is loaded from the static archive libruby.a, and if your app
> doesn't export it symbols, the loaded library won't be able to find
> them, or Ruby's.
> 
> On Tue, 2002-04-02 at 23:01, Dennis Newbold wrote:
> > Unless you've tried doing something like this, you may not be
> > able to help much, but I'm hoping that someone on the list has
> > encountered this problem or a similar one before.
> > 
> > For reasons to lengthy to go into now, what I am attempting to
> > do is to write a C program which embeds a Ruby interpreter
> > which then runs a ruby script which then "requires" an extension
> > module which is written in C.  Like I said, don't ask why unless
> > you want a 5 minute explanation.
> > 
> > The problem is that one of the routine in the extension module
> > call rb_raise, passing rb_eTypeError as an argument.  rb_eTypeError
> > is coming up as an undefined symbol, and the require statement is
> > failing.  I've given:
> > 
> >   -Wl,-rpath,/usr/lib/ruby/1.6/i686-linux as an argument to gcc
> > 
> > to tell ld-linux.so to include this directory in its search path,
> > and rb_eTypeError is defined in error.o which is found in libruby.a.
> > nm shows the type of rb_eTypeError to be 'C', which means a common
> > symbol, although I'm not sure that makes a difference.  Anyway,
> > so far, I can't figure out why the dynamic loader (dlopen call in
> > dln.c) can't seem to find the definition of rb_eTypeError.
> > 
> > I  tried writing a small example program, which "required" a small
> > exa.rb routine which defined a module with one method which
> > immediately called "raise TypeError, ...".  Unfortunately, for
> > some unknown reason, the example worked, while my program
> > doesn't.
> > 
> > If anyone has any suggestions, I'd appreciate it.  In the meantime,
> > I'll try to come up with a simple example program which illustrates
> > the problem.  Thanks.
> > 
> > Dennis 
> > 
> > ---------------------------------------------
> > |                                           |
> > |     The way to be happy is to be good     |
> > |                                           |
> > ---------------------------------------------
> > 
> 
>