gcc/testsuite/gcc.dg/torture/pr71132.c

   1 /* { dg-do compile } */
   2 /* { dg-additional-options "-Wno-stringop-overflow" } */
   3 /* The loop below writes past the end of the global object a.
   4    When the loop is transformed into a call to memcpy the buffer
   5    overflow is detected and diagnosed by the -Wstringop-overflow
   6    option enabled by default.  */
   7
   8 typedef unsigned size_t;
   9 struct {
  10     unsigned char buf[sizeof(long)];
  11 } a;
  12 size_t b;
  13 int main()
  14 {
  15   size_t c, i;
  16   unsigned char *d;
  17   for (; c < sizeof(long);)
  18     {
  19       d = a.buf;
  20       b = 0;
  21       for (; b < i; b++)
  22         *d++ = '\0';
  23       for (; c < b; c++)
  24         *d++ = 'a';
  25       c = 0;
  26       for (; i < sizeof(long); i++)
  27         ;
  28     }
  29 }