gcc/testsuite/gcc.dg/uninit-8.c

   1 /* Uninitialized variable warning tests...
   2    Inspired by part of optabs.c:expand_binop.
   3    May be the same as uninit-1.c.  */
   4
   5 /* { dg-do compile } */
   6 /* { dg-options "-O -Wuninitialized" } */
   7
   8 #include <limits.h>
   9
  10 void
  11 add_bignums (int *out, int *x, int *y)
  12 {
  13     int p, sum;
  14     int carry; /* { dg-bogus "carry" "uninitialized variable warning" } */
  15
  16     p = 0;
  17     for (; *x; x++, y++, out++, p++)
  18     {
  19         if (p)
  20             sum = *x + *y + carry;
  21         else
  22             sum = *x + *y;
  23
  24         if (sum < 0)
  25         {
  26             carry = 1;
  27             sum -= INT_MAX;
  28         }
  29         else
  30             carry = 0;
  31     }
  32 }