1 // RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic -Wextra -std=c11
2 // RUN: %clang_cc1 %s -fsyntax-only -triple i686-unknown-unknown -verify -pedantic -Wextra -std=c11
3 // RUN: %clang_cc1 %s -fsyntax-only -triple x86_64-unknown-unknown -verify -pedantic -Wextra -std=c11
4
5 #include <stdint.h>
6
7 typedef struct S S; // expected-note 4 {{forward declaration of 'struct S'}}
8 extern _Atomic(S*) e;
a(S * b,void * c)9 void a(S* b, void* c) {
10 void (*fp)(int) = 0;
11 b++; // expected-error {{arithmetic on a pointer to an incomplete type}}
12 b += 1; // expected-error {{arithmetic on a pointer to an incomplete type}}
13 c++; // expected-warning {{arithmetic on a pointer to void is a GNU extension}}
14 c += 1; // expected-warning {{arithmetic on a pointer to void is a GNU extension}}
15 c--; // expected-warning {{arithmetic on a pointer to void is a GNU extension}}
16 c -= 1; // expected-warning {{arithmetic on a pointer to void is a GNU extension}}
17 (void) c[1]; // expected-warning {{subscript of a pointer to void is a GNU extension}}
18 b = 1+b; // expected-error {{arithmetic on a pointer to an incomplete type}}
19 /* The next couple tests are only pedantic warnings in gcc */
20 void (*d)(S*,void*) = a;
21 d += 1; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
22 d++; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
23 d--; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
24 d -= 1; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
25 (void)(1 + d); // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
26 e++; // expected-error {{arithmetic on a pointer to an incomplete type}}
27 intptr_t i = (intptr_t)b;
28 char *f = (char*)0 + i; // expected-warning {{arithmetic on a null pointer treated as a cast from integer to pointer is a GNU extension}}
29 // Cases that don't match the GNU inttoptr idiom get a different warning.
30 f = (char*)0 - i; // expected-warning {{performing pointer arithmetic on a null pointer has undefined behavior}}
31 int *g = (int*)0 + i; // expected-warning {{performing pointer arithmetic on a null pointer has undefined behavior}}
32 }
33