From bug-octave-request at bevo dot che dot wisc dot edu  Tue Apr  7 15:45:03 1998
Subject: bus error while senseless making global ...
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: Guido Dietz <guido at aia036 dot aia dot RWTH-Aachen dot De>
Cc: bug-octave at bevo dot che dot wisc dot edu
Date: Tue, 7 Apr 1998 15:41:13 -0500 (CDT)

On  7-Apr-1998, Guido Dietz <guido at aia036 dot aia dot RWTH-Aachen dot De> wrote:

| Bug report for Octave 2.0.11 configured for hppa1.1-hp-hpux10.20
| 
| Description:
| -----------
| Trying to make a builtin constant global results in:
| 
|   1>> global i
|   error: bus error -- stopping myself...
|   attempting to save variables to `octave-core'...
|   save to `octave-core' complete

Please try the following patch.

Thanks!

jwe


Tue Apr  7 15:38:29 1998  John W. Eaton  <jwe at bevo dot che dot wisc dot edu>

	* symtab.cc (symbol_record::variable_value): Avoid dereferencing
	NULL pointer.


*** symtab.cc.orig	Tue Apr  7 15:40:01 1998
--- symtab.cc	Tue Apr  7 15:40:17 1998
***************
*** 617,623 ****
    if (is_variable ())
      {
        tree_constant *tmp = (tree_constant *) def ();
!       retval = tmp->value ();
      }
  
    return retval;
--- 617,625 ----
    if (is_variable ())
      {
        tree_constant *tmp = (tree_constant *) def ();
! 
!       if (tmp)
! 	retval = tmp->value ();
      }
  
    return retval;