Bug#376901: gcc4 (*p)+=(*p=6) bug

[NyOS <nyos@nyos.homelinux.net>]

Package: gcc
Version: 4:4.0.3-4

gcc -v
gcc version 4.0.4 20060507 (prerelease) (Debian 4.0.3-3)

Hi!

I use testing version of debian with gcc4, and it compiles the following c  
code wrong way:

#include <stdio.h>

int a=13;
int t[1]={13};
int b=13;
int *p;

int main()
{
  p=&b;
  printf("a:%d t[0]:%d *p:%d\n",a,t[0],*p);
  a+=(a=2)+(a=3);
  t[0]+=(t[0]=2)+(t[0]=3);
  (*p)+=((*p)=2)+((*p)=3);
  printf("a:%d t[0]:%d *p:%d\n",a,t[0],*p);

  a=2;
  t[0]=2;
  *p=2;
  a+=(a=6);
  t[0]+=t[0]=6;
  (*p)+=(*p=6);
  printf("a:%d t[0]:%d *p:%d\n",a,t[0],*p);
}


nyos@nyos:~/src/nyesoteric/urisc/bugvadasz$ gcc a.c && ./a.out
a:13 t[0]:13 *p:13
a:8 t[0]:18 *p:18
a:12 t[0]:8 *p:8

While gcc 3.4 seems ok:
nyos@nyos:~/src/nyesoteric/urisc/bugvadasz$ gcc-3.4 a.c && ./a.out
a:13 t[0]:13 *p:13
a:8 t[0]:8 *p:8
a:12 t[0]:12 *p:12

(Both compiled without -O flag)

__________________________________
Light thinks it travels faster than anything but it is wrong. No matter  
how fast light travels it finds the darkness has always got there first,  
and is waiting for it. - Terry Pratchett