optimization/6597: ICE in set_mem_alias_set compiling Qt with -O2 on ia64

[Janis Johnson]

The following reply was made to PR optimization/6597; it has been noted by GNATS.

From: Janis Johnson <janis187@us.ibm.com>
To: janis187@us.ibm.com
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: optimization/6597: ICE in set_mem_alias_set compiling Qt with -O2 on ia64
Date: Fri, 11 Oct 2002 11:40:16 -0700

 This ICE still occurs with GCC 3.3 20021008 (experimental) on ia64 when
 Qt is compiled with -O2.  It's a regression from GCC 3.1.  It doesn't
 occur when the mainline is built with checking disabled, so it won't
 show up in the release version unless GCC is built with checking
 enabled.  Qt passes all of its tests when built with -O2 using mainline
 G++ built with checking disabled.
 
 The bug was introduced sometime between 20020228 and 20020315.  GCC
 didn't build (even for a simple build of C and C++) on ia64-linux
 between those dates, which was right after 3.1 had branched so there
 were LOTS of changes.
 
 I'll leave this PR open for now, but unless the bug shows up in other
 places it's probably not worth worrying about.  Here's a cut-down test
 case:
 
 struct QWidget {
   void repaint (int x, int y, int w, int h, bool erase=true);
 };
 
 void
 foo ()
 {
   typedef void (QWidget::*t14)(int, int, int, int, bool);
   t14 v14 = &QWidget::repaint;
 }