| // RUN: %clang_cc1 %s -fsyntax-only -verify -Wc++-compat |
| |
| struct emp_1 { // expected-warning {{empty struct has size 0 in C, size 1 in C++}} |
| }; |
| |
| union emp_2 { // expected-warning {{empty union has size 0 in C, size 1 in C++}} |
| }; |
| |
| struct emp_3 { // expected-warning {{struct has size 0 in C, size 1 in C++}} |
| int : 0; |
| }; |
| |
| union emp_4 { // expected-warning {{union has size 0 in C, size 1 in C++}} |
| int : 0; |
| }; |
| |
| struct emp_5 { // expected-warning {{struct has size 0 in C, size 1 in C++}} |
| int : 0; |
| int : 0; |
| }; |
| |
| union emp_6 { // expected-warning {{union has size 0 in C, size 1 in C++}} |
| int : 0; |
| int : 0; |
| }; |
| |
| struct emp_7 { // expected-warning {{struct has size 0 in C, size 1 in C++}} |
| struct emp_1 f1; |
| }; |
| |
| union emp_8 { // expected-warning {{union has size 0 in C, size 1 in C++}} |
| struct emp_1 f1; |
| }; |
| |
| struct emp_9 { // expected-warning {{struct has size 0 in C, non-zero size in C++}} |
| struct emp_1 f1; |
| union emp_2 f2; |
| }; |
| |
| // Checks for pointer subtraction (PR15683) |
| struct emp_1 *func_1p(struct emp_1 *x) { return x - 5; } |
| |
| int func_1() { |
| struct emp_1 v[1]; |
| return v - v; // expected-warning {{subtraction of pointers to type 'struct emp_1' of zero size has undefined behavior}} |
| } |
| |
| int func_2(struct emp_1 *x) { |
| return 1 + x - x; // expected-warning {{subtraction of pointers to type 'struct emp_1' of zero size has undefined behavior}} |
| } |
| |
| int func_3(struct emp_1 *x, struct emp_1 *y) { |
| return x - y; // expected-warning {{subtraction of pointers to type 'struct emp_1' of zero size has undefined behavior}} |
| } |
| |
| int func_4(struct emp_1 *x, const struct emp_1 *y) { |
| return x - y; // expected-warning {{subtraction of pointers to type 'struct emp_1' of zero size has undefined behavior}} |
| } |
| |
| int func_5(volatile struct emp_1 *x, const struct emp_1 *y) { |
| return x - y; // expected-warning {{subtraction of pointers to type 'struct emp_1' of zero size has undefined behavior}} |
| } |
| |
| int func_6() { |
| union emp_2 v[1]; |
| return v - v; // expected-warning {{subtraction of pointers to type 'union emp_2' of zero size has undefined behavior}} |
| } |
| |
| struct A; // expected-note {{forward declaration of 'struct A'}} |
| |
| int func_7(struct A *x, struct A *y) { |
| return x - y; // expected-error {{arithmetic on a pointer to an incomplete type 'struct A'}} |
| } |
| |
| int func_8(struct emp_1 (*x)[10], struct emp_1 (*y)[10]) { |
| return x - y; // expected-warning {{subtraction of pointers to type 'struct emp_1 [10]' of zero size has undefined behavior}} |
| } |
| |
| int func_9(struct emp_1 (*x)[], struct emp_1 (*y)[]) { |
| return x - y; // expected-error {{arithmetic on a pointer to an incomplete type 'struct emp_1 []'}} |
| } |
| |
| int func_10(int (*x)[0], int (*y)[0]) { |
| return x - y; // expected-warning {{subtraction of pointers to type 'int [0]' of zero size has undefined behavior}} |
| } |