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; 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