| // RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic -Wextra -std=c11 |
| // RUN: %clang_cc1 %s -fsyntax-only -triple i686-unknown-unknown -verify -pedantic -Wextra -std=c11 |
| // RUN: %clang_cc1 %s -fsyntax-only -triple x86_64-unknown-unknown -verify -pedantic -Wextra -std=c11 |
| |
| #include <stdint.h> |
| |
| typedef struct S S; // expected-note 4 {{forward declaration of 'struct S'}} |
| extern _Atomic(S*) e; |
| void a(S* b, void* c) { |
| void (*fp)(int) = 0; |
| b++; // expected-error {{arithmetic on a pointer to an incomplete type}} |
| b += 1; // expected-error {{arithmetic on a pointer to an incomplete type}} |
| c++; // expected-warning {{arithmetic on a pointer to void is a GNU extension}} |
| c += 1; // expected-warning {{arithmetic on a pointer to void is a GNU extension}} |
| c--; // expected-warning {{arithmetic on a pointer to void is a GNU extension}} |
| c -= 1; // expected-warning {{arithmetic on a pointer to void is a GNU extension}} |
| (void) c[1]; // expected-warning {{subscript of a pointer to void is a GNU extension}} |
| b = 1+b; // expected-error {{arithmetic on a pointer to an incomplete type}} |
| /* The next couple tests are only pedantic warnings in gcc */ |
| void (*d)(S*,void*) = a; |
| d += 1; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}} |
| d++; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}} |
| d--; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}} |
| d -= 1; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}} |
| (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}} |
| e++; // expected-error {{arithmetic on a pointer to an incomplete type}} |
| intptr_t i = (intptr_t)b; |
| char *f = (char*)0 + i; // expected-warning {{arithmetic on a null pointer treated as a cast from integer to pointer is a GNU extension}} |
| // Cases that don't match the GNU inttoptr idiom get a different warning. |
| f = (char*)0 - i; // expected-warning {{performing pointer arithmetic on a null pointer has undefined behavior}} |
| int *g = (int*)0 + i; // expected-warning {{performing pointer arithmetic on a null pointer has undefined behavior}} |
| } |
