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Date: Sat, 03 May 2003 23:26:00 -0000
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From: Dan Nicolaescu <dann@ics.uci.edu>
Subject: Re: c/2480: aliasing problem with global structures
Reply-To: Dan Nicolaescu <dann@ics.uci.edu>
X-SW-Source: 2003-05/txt/msg00216.txt.bz2
List-Id: <gcc-prs.sourceware.org>

The following reply was made to PR c/2480; it has been noted by GNATS.

From: Dan Nicolaescu <dann@ics.uci.edu>
To: bangerth@dealii.org
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: c/2480: aliasing problem with global structures
Date: Sat, 03 May 2003 16:18:09 -0700

 With the tweaks below the code in this PR can be added to the
 GCC testsuite in case somebody wants to do that.
 
 /* { dg-do link } */
 
 struct example
 {
   char a;
   int b;
   char c;
 } *ex1;
 
 extern void link_error(void);
 
 void
 bar (void)
 {
   ex1->a = 1;
   ex1->b = 2;
   ex1->c = 3;
   
   if (ex1->a != 1)
     link_error ();
   if (ex1->b != 2)
     link_error ();
   if (ex1->c != 3)
     link_error ();
 
 }
 
 void
 foo (struct example *ex2)
 {
   ex2->a = 1;
   ex2->b = 2;
   ex2->c = 3;
 
   if (ex2->a != 1)
     link_error ();
   if (ex2->b != 2)
     link_error ();
   if (ex2->c != 3)
     link_error ();
 
 }
 
 int main (void)
 {
   bar ();
   foo (ex1);
   return 0;
 }