gcc/testsuite/gcc.dg/pr78973.c

   1 /* PR c/78973 - warning: ‘memcpy’: specified size exceeds maximum object size
   2
   3    Test case for what was initially thought to be a false positive but after
   4    deeper investigation turned out to be a true positive.
   5
   6    { dg-do compile }
   7    { dg-options "-O2 -Wall" } */
   8
   9 void f (void *p, int n)
  10 {
  11   if (n <= 4)
  12     __builtin_memset (p, 0, n);   /* { dg-warning "exceeds maximum object size" "pr79073" { xfail ilp32 } } */
  13 }
  14
  15 void g (void *d, unsigned n)
  16 {
  17   if (n < 5)
  18     n = 5;
  19   f (d, n);
  20 }