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. */
f1(void)10 void f1 (void)
11 {
12 __builtin_sprintf (d, "%i", 123); /* { dg-warning "directive writing 3 bytes" } */
13 }
14
15 /* Verify -Wformat-truncation works. */
f2(void)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. */
f3(void)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. */
f4(int i)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" } } */
38