1 /* PR 35503 - Warn about restricted pointers
2 Test to exercise that -Wrestrict warnings are issued for memory and
3 sring functions when they are declared in system headers (i.e., not
4 just when they are explicitly declared in the source file.)
5 Also verify that the warnings are issued even for calls where the
6 source of the aliasing violation is in a different function than
9 { dg-options "-O2 -Wrestrict" } */
11 #if __has_include (<stddef.h>)
14 /* For cross-compilers. */
15 typedef __PTRDIFF_TYPE__
ptrdiff_t;
16 typedef __SIZE_TYPE__
size_t;
19 #if __has_include (<string.h>)
27 extern void* memcpy (void*, const void*, size_t);
28 extern char* strcat (char*, const char*);
29 extern char* strcpy (char*, const char*);
30 extern char* strncat (char*, const char*, size_t);
31 extern char* strncpy (char*, const char*, size_t);
35 static void wrap_memcpy (void *d
, const void *s
, size_t n
)
37 memcpy (d
, s
, n
); /* { dg-warning "accessing 2 bytes at offsets 0 and 1 overlaps 1 byte at offset 1" "memcpy" } */
40 void call_memcpy (char *d
)
42 const void *s
= d
+ 1;
43 wrap_memcpy (d
, s
, 2);
47 static void wrap_strcat (char *d
, const char *s
)
49 strcat (d
, s
); /* { dg-warning "source argument is the same as destination" "strcat" } */
52 void call_strcat (char *d
)
59 static void wrap_strcpy (char *d
, const char *s
)
61 strcpy (d
, s
); /* { dg-warning "source argument is the same as destination" "strcpy" } */
64 void call_strcpy (char *d
)
71 static void wrap_strncat (char *d
, const char *s
, size_t n
)
73 strncat (d
, s
, n
); /* { dg-warning "source argument is the same as destination" "strncat" } */
76 void call_strncat (char *d
, size_t n
)
79 wrap_strncat (d
, s
, n
);
83 static void wrap_strncpy (char *d
, const char *s
, size_t n
)
85 strncpy (d
, s
, n
); /* { dg-warning "source argument is the same as destination" "strncpy" } */
88 void call_strncpy (char *d
, size_t n
)
91 wrap_strncpy (d
, s
, n
);