Viewing file:  Wdangling-pointer.c (1.78 KB) -rw-r--r--
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/* Exercise basic C-only cases of -Wdangling-pointer.
{ dg-do compile }
{ dg-options "-O0 -Wall" }
{ dg-require-effective-target alloca } */
typedef __SIZE_TYPE__ size_t;
extern void* memchr (const void*, int, size_t);
extern char* strchr (const char*, int);
void sink (const void*, ...);
void nowarn_compound_literal (int i)
{
{
int *p = (int[]){ 1, 2, 3 };
sink (p);
}
{
int *q = (int[]){ 1, 2, 3 };
int *p = &q[1];
sink (p);
}
{
int *p = __builtin_memchr ((int[]){ 1, 2, 3 }, 2, 3 * sizeof *p);
sink (p);
}
{
int *p = __builtin_memchr ((int[]){ i, i + 1 }, 3, 2 * sizeof *p);
sink (p);
}
}
void warn_compound_literal (int i)
{
int *p;
{
p = (int[]){ 1, 2, 3 }; // { dg-message "unnamed temporary" },
}
sink (p); // { dg-warning "using dangling pointer 'p' to an unnamed temporary" }
{
int *q =
(int[]){ 1, 2, 3 }; // { dg-message "unnamed temporary" },
p = &q[1];
}
sink (p); // { dg-warning "using dangling pointer 'p' to an unnamed temporary" }
{
p = (int*)memchr (
(int[]){ 1, 2, 3 }, // { dg-message "unnamed temporary" }
2, 3 * sizeof *p);
}
sink (p); // { dg-warning "using dangling pointer 'p' to an unnamed temporary" }
{
p = (int*)memchr (
(int[]){ i, i + 1 },// { dg-message "unnamed temporary" }
3, 2 * sizeof *p);
}
sink (p); // { dg-warning "using dangling pointer 'p' to an unnamed temporary" }
}
void warn_store_compound_literal (int **p)
{
int *q = (int[]) { 1, 2, 3 };
p[0] = q; // { dg-warning "storing the address" }
}
void warn_store_vla (int n, int **p)
{
int a[n];
p[1] = &a[1]; // { dg-warning "-Wdangling-pointer" "pr??????" { xfail *-*-* } }
}
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