optimization/6631: Miscompiled structure access

[Janis Johnson]

The following reply was made to PR optimization/6631; it has been noted by GNATS.

From: Janis Johnson <janis187@us.ibm.com>
To: gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: optimization/6631: Miscompiled structure access
Date: Tue, 8 Oct 2002 11:39:50 -0700

 This is a regression from GCC 3.0 that was exposed by the following cp
 patch:
 
 2002-04-30  Mark Mitchell  <mark@codesourcery.com>
 
 	ABI change, returning simple classes from functions.
 	* class.c (finish_struct_bits): Only mark TREE_ADDRESSABLE if
 	TYPE_HAS_TRIVIAL_INIT_REF is false or
 	TYPE_HAS_NONTRIVIAL_DESTRUCTOR is true.
 
 The test passes with optimization on if it is altered by adding a
 destructor or a copy constructor to class QSize, or by removing "const"
 from "inline const QSize operator+".
 
 I'm not planning to investigate this further, but hope this additional
 information will be useful.
 
 Janis