the ternary operator causes incrementation of left hand side expression to occurs before it should in an expression where the variable appears at both side of the affectation expression.
example: *s++ = (*s == 'x') ?  'X': *s;
Note: this does not appears in gcc-2.96 (Mandrake 8.2)

Release:
gcc 2.95.2 - gcc 2.95.3 - gcc 3.04

Environment:
gcc 2.95.3, gcc 3.04 (home compiled on Linux Mandrake 8.1)
Mac OS X : gcc 2.95.2

How-To-Repeat:
#include <stdio.h>
#define STRING "abc"
int main()
{
   char s[10], *t;

   strcpy(s, STRING);
   t = s;
   while (*t != '\0')
    *t++ = (*t == 'b') ? 'X': *t;
 
        /*  this print "Xc" instead of "aXc"  */
   printf("%s\n",s);
}