34 lines · c
1// RUN: %clang_cc1 %s -fsyntax-only -verify=gnu,expected -pedantic -Wextra -std=c112// RUN: %clang_cc1 %s -fsyntax-only -triple i686-unknown-unknown -verify=gnu,expected -pedantic -Wextra -std=c113// RUN: %clang_cc1 %s -fsyntax-only -triple x86_64-unknown-unknown -verify=gnu,expected -pedantic -Wextra -std=c114// RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic -Wextra -Wno-gnu -std=c115 6#include <stdint.h>7 8typedef struct S S; // expected-note 4 {{forward declaration of 'struct S'}}9extern _Atomic(S*) e;10void 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