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Problems with rb_struct_define and 64 bit Ruby
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Daniel Berger  
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 More options Jun 8 2006, 1:02 am
From: "Daniel Berger" <djber...@gmail.com>
Date: Thu, 8 Jun 2006 14:02:47 +0900
Local: Thurs, Jun 8 2006 1:02 am
Subject: Problems with rb_struct_define and 64 bit Ruby
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Hi all,

Ruby 1.8.4, 64 bit, built with --enable-pthread - no other special options
Suse Linux 9.3

It's late and I'm tired, so maybe I'm doing something dumb here, but this
code segfaults:

/* foo.c */
#include "ruby.h"
VALUE v_my_struct;

void Init_foo(){
   v_my_struct =
      rb_struct_define("MyStruct", "fee", "fi", "fo", "alpha", "beta",
"gamma", 0);

}

# extconf.rb
require 'mkmf'
create_makefile('foo')

# test.rb
$:.unshift Dir.pwd
require 'foo'

Take away any one member, and it works.  Any more than five and it
segfaults.  What gives?

Thanks,

Dan


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ts  
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 More options Jun 8 2006, 3:20 am
From: ts <dec...@moulon.inra.fr>
Date: Thu, 8 Jun 2006 16:20:54 +0900
Local: Thurs, Jun 8 2006 3:20 am
Subject: Re: Problems with rb_struct_define and 64 bit Ruby
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>>>>> "D" == Daniel Berger <djber...@gmail.com> writes:

D>       rb_struct_define("MyStruct", "fee", "fi", "fo", "alpha", "beta",
D> "gamma", 0);

   ^^^^^^^^^^

   "gamma", NULL);

D> }

  ...

Guy Decoux


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Austin Ziegler  
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 More options Jun 8 2006, 5:52 pm
From: "Austin Ziegler" <halosta...@gmail.com>
Date: Fri, 9 Jun 2006 06:52:01 +0900
Local: Thurs, Jun 8 2006 5:52 pm
Subject: Re: Problems with rb_struct_define and 64 bit Ruby
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On 6/8/06, ts <dec...@moulon.inra.fr> wrote:

> >>>>> "D" == Daniel Berger <djber...@gmail.com> writes:
> D>       rb_struct_define("MyStruct", "fee", "fi", "fo", "alpha", "beta",
> D> "gamma", 0);

>    ^^^^^^^^^^

>    "gamma", NULL);

> D> }

Gah. That's one of the things that I absolutely *despise* about C as
opposed to C++. I *like* that I can use 0 as if it were the same thing
as NULL and not (void*)0.

-austin
--
Austin Ziegler * halosta...@gmail.com
               * Alternate: aus...@halostatue.ca


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ts  
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 More options Jun 9 2006, 3:58 am
From: ts <dec...@moulon.inra.fr>
Date: Fri, 9 Jun 2006 16:58:01 +0900
Local: Fri, Jun 9 2006 3:58 am
Subject: Re: Problems with rb_struct_define and 64 bit Ruby
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>>>>> "A" == Austin Ziegler <halosta...@gmail.com> writes:

A> Gah. That's one of the things that I absolutely *despise* about C as
A> opposed to C++. I *like* that I can use 0 as if it were the same thing
A> as NULL and not (void*)0.

 Well, the architecture x86_64 was created to make in sort that C
 programmer understand the difference between (int)0 and (void *)0

 :-)

Guy Decoux


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