gcc/testsuite/gcc.dg/tree-ssa/pr79691.c

   1 /* PR tree-optimization/79691 - -Wformat-truncation suppressed by
   2    (and only by) -Og
   3
   4    { dg-do compile }
   5    { dg-options "-Og -Wall -fdump-tree-optimized" } */
   6
   7 char d[2];
   8
   9 /* Verify -Wformat-overflow works.  */
  10 void f1 (void)
  11 {
  12   __builtin_sprintf (d, "%i", 123);   /* { dg-warning "directive writing 3 bytes" } */
  13 }
  14
  15 /* Verify -Wformat-truncation works.  */
  16 void f2 (void)
  17 {
  18   __builtin_snprintf (d, sizeof d, "%i", 1234);   /* { dg-warning "output truncated writing 4 bytes" } */
  19 }
  20
  21 /* Verify -fprintf-return-value works.  */
  22 int f3 (void)
  23 {
  24   return __builtin_snprintf (0, 0, "%i", 12345);
  25 }
  26
  27 /* Verify -fprintf-return-value results used for constant propagation.  */
  28 int f4 (int i)
  29 {
  30   int n1 = __builtin_snprintf (0, 0, "%i", 1234);
  31   int n2 = __builtin_snprintf (0, 0, "%i", 12345);
  32   return n1 + n2;
  33 }
  34
  35 /* { dg-final { scan-tree-dump-times "sprintf" 1 "optimized" } }
  36    { dg-final { scan-tree-dump-times "snprintf" 1 "optimized" } }
  37    { dg-final { scan-tree-dump " = 9;" "optimized" } } */