1 // RUN: %clang_cc1 %s -fsyntax-only -verify=gnu,expected -pedantic -Wextra -std=c11
2 // RUN: %clang_cc1 %s -fsyntax-only -triple i686-unknown-unknown -verify=gnu,expected -pedantic -Wextra -std=c11
3 // RUN: %clang_cc1 %s -fsyntax-only -triple x86_64-unknown-unknown -verify=gnu,expected -pedantic -Wextra -std=c11
4 // RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic -Wextra -Wno-gnu -std=c11
5
6 #include <stdint.h>
7
8 typedef struct S S; // expected-note 4 {{forward declaration of 'struct S'}}
9 extern _Atomic(S*) e;
a(S * b,void * c)10 void a(S* b, void* c) {
11 void (*fp)(int) = 0;
12 b++; // expected-error {{arithmetic on a pointer to an incomplete type}}
13 b += 1; // expected-error {{arithmetic on a pointer to an incomplete type}}
14 c++; // gnu-warning {{arithmetic on a pointer to void is a GNU extension}}
15 c += 1; // gnu-warning {{arithmetic on a pointer to void is a GNU extension}}
16 c--; // gnu-warning {{arithmetic on a pointer to void is a GNU extension}}
17 c -= 1; // gnu-warning {{arithmetic on a pointer to void is a GNU extension}}
18 (void) c[1]; // gnu-warning {{subscript of a pointer to void is a GNU extension}}
19 b = 1+b; // expected-error {{arithmetic on a pointer to an incomplete type}}
20 /* The next couple tests are only pedantic warnings in gcc */
21 void (*d)(S*,void*) = a;
22 d += 1; // gnu-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
23 d++; // gnu-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
24 d--; // gnu-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
25 d -= 1; // gnu-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
26 (void)(1 + d); // gnu-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
27 e++; // expected-error {{arithmetic on a pointer to an incomplete type}}
28 intptr_t i = (intptr_t)b;
29 char *f = (char*)0 + i; // gnu-warning {{arithmetic on a null pointer treated as a cast from integer to pointer is a GNU extension}}
30 // Cases that don't match the GNU inttoptr idiom get a different warning.
31 f = (char*)0 - i; // expected-warning {{performing pointer arithmetic on a null pointer has undefined behavior}}
32 int *g = (int*)0 + i; // expected-warning {{performing pointer arithmetic on a null pointer has undefined behavior}}
33 }
34