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150
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1 // RUN: %clang_cc1 %s -triple %itanium_abi_triple -fsyntax-only -verify -Wc++-compat
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2
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3 // Note: Empty C structs are 4 bytes in the Microsoft ABI.
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4
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5 struct emp_1 { // expected-warning {{empty struct has size 0 in C, size 1 in C++}}
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6 };
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7
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8 union emp_2 { // expected-warning {{empty union has size 0 in C, size 1 in C++}}
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9 };
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10
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11 struct emp_3 { // expected-warning {{struct has size 0 in C, size 1 in C++}}
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12 int : 0;
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13 };
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14
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15 union emp_4 { // expected-warning {{union has size 0 in C, size 1 in C++}}
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16 int : 0;
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17 };
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18
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19 struct emp_5 { // expected-warning {{struct has size 0 in C, size 1 in C++}}
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20 int : 0;
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21 int : 0;
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22 };
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23
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24 union emp_6 { // expected-warning {{union has size 0 in C, size 1 in C++}}
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25 int : 0;
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26 int : 0;
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27 };
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28
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29 struct emp_7 { // expected-warning {{struct has size 0 in C, size 1 in C++}}
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30 struct emp_1 f1;
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31 };
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32
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33 union emp_8 { // expected-warning {{union has size 0 in C, size 1 in C++}}
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34 struct emp_1 f1;
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35 };
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36
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37 struct emp_9 { // expected-warning {{struct has size 0 in C, non-zero size in C++}}
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38 struct emp_1 f1;
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39 union emp_2 f2;
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40 };
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41
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42 // Checks for pointer subtraction (PR15683)
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43 struct emp_1 *func_1p(struct emp_1 *x) { return x - 5; }
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44
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45 int func_1() {
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46 struct emp_1 v[1];
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47 return v - v; // expected-warning {{subtraction of pointers to type 'struct emp_1' of zero size has undefined behavior}}
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48 }
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49
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50 int func_2(struct emp_1 *x) {
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51 return 1 + x - x; // expected-warning {{subtraction of pointers to type 'struct emp_1' of zero size has undefined behavior}}
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52 }
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53
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54 int func_3(struct emp_1 *x, struct emp_1 *y) {
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55 return x - y; // expected-warning {{subtraction of pointers to type 'struct emp_1' of zero size has undefined behavior}}
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56 }
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57
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58 int func_4(struct emp_1 *x, const struct emp_1 *y) {
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59 return x - y; // expected-warning {{subtraction of pointers to type 'struct emp_1' of zero size has undefined behavior}}
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60 }
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61
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62 int func_5(volatile struct emp_1 *x, const struct emp_1 *y) {
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63 return x - y; // expected-warning {{subtraction of pointers to type 'struct emp_1' of zero size has undefined behavior}}
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64 }
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65
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66 int func_6() {
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67 union emp_2 v[1];
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68 return v - v; // expected-warning {{subtraction of pointers to type 'union emp_2' of zero size has undefined behavior}}
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69 }
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70
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71 struct A; // expected-note {{forward declaration of 'struct A'}}
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72
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73 int func_7(struct A *x, struct A *y) {
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74 return x - y; // expected-error {{arithmetic on a pointer to an incomplete type 'struct A'}}
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75 }
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76
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77 int func_8(struct emp_1 (*x)[10], struct emp_1 (*y)[10]) {
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78 return x - y; // expected-warning {{subtraction of pointers to type 'struct emp_1 [10]' of zero size has undefined behavior}}
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79 }
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80
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81 int func_9(struct emp_1 (*x)[], struct emp_1 (*y)[]) {
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82 return x - y; // expected-error {{arithmetic on a pointer to an incomplete type 'struct emp_1 []'}}
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83 }
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84
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85 int func_10(int (*x)[0], int (*y)[0]) {
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86 return x - y; // expected-warning {{subtraction of pointers to type 'int [0]' of zero size has undefined behavior}}
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87 }
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