From: Gary <gapjunk@...>
Date: 2007-10-21T01:55:03+09:00
Subject: Re: Building an extension in C++


Thank you Robert!  I agree and understand about catching and
converting C++ exceptions to Ruby exceptions.

Now, on to my next problem.  When I try using new I get linker errors
(grrr)

extern "C" void Init_Test() {
  cTest = rb_define_class("Test", rb_cObject);

  try
  {
    int *x=new int;
  }
  catch (...)
  {
  }
 }

I get the following errors:

undefined reference to '___gxx_personality_sj0'
undefined reference to 'operator new(unsigned int)
undefined reference to '___cxa_begine_catch'
undefined reference to '___cxa_end_catch'

It compiles nicely if I replace:
  int *x=new int;
with
  int *x=NULL

     -Gary

On Oct 20, 9:05 am, Robert Klemme <shortcut...@googlemail.com> wrote:
> On 20.10.2007 17:19, Gary wrote:
>
>
>
>
>
>
>
> > Thank you mental!!!  It works.  I should have figured it out myself,
> > but I needed your help.
>
> > I'm I bit confused about a C-linkage interface to the C++ portion.  Is
> > this going to be more than wrapping the C++ calls in try catch(...)
> > In other words having something like
>
> > extern "C" VALUE t_init(VALUE self)
> > {
> >   //declare any Ruby C++ data conversion vars in C
> >   try
> >     {
> >     //call C++ functions
> >     }
> >   catch(...)
> >     {
> >     //process exceptions
> >     }
> >   //Do any data interactions between C++ and Ruby
> > }
>
> > Once again, thanks!  I spent several hours stumped.
>
> That'll probably suffice.  You might get a bit better results by
> catching explicit exception types and converting them to Ruby world
> exceptions.  Other than that your code should prevent any havoc caused
> by C++ exceptions raised into the Ruby interpreter.
>
> Kind regards
>
>         robert