1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++1y -triple x86_64-linux-gnu %s
2
3 // If there is a preceding declaration of the entity *in the same scope* in
4 // which the bound was specified, an omitted array bound is taken to be the
5 // same as in that earlier declaration
6
7 // rdar://13535367
8 namespace test0 {
9 extern "C" int array[];
declare()10 void declare() { extern int array[100]; }
11 int value1 = sizeof(array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
12 extern "C" int array[];
13 int value2 = sizeof(array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
14 }
15
16 namespace test1 {
17 extern "C" int array[];
test()18 void test() {
19 { extern int array[100]; }
20 extern int array[];
21 int x = sizeof(array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
22 }
23 }
24
25 namespace test2 {
declare()26 void declare() { extern int array[100]; }
27 extern int array[];
28 int value = sizeof(array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
29 }
30
31 namespace test3 {
test()32 void test() {
33 { extern int array[100]; }
34 extern int array[];
35 int x = sizeof(array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
36 }
37 }
38
39 namespace test4 {
40 extern int array[];
test()41 void test() {
42 extern int array[100];
43 int x = sizeof(array);
44 }
45 int y = sizeof(array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
46 }
47
48 namespace test5 {
test()49 void test() {
50 extern int array[100];
51 extern int array[];
52 int x = sizeof(array);
53 }
54 }
55
56 namespace test6 {
test()57 void test() {
58 extern int array[100];
59 {
60 extern int array[];
61 int x = sizeof(array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
62 }
63 int y = sizeof(array);
64 extern int array[];
65 int z = sizeof(array);
66 }
67 }
68
69 namespace test7 {
70 extern int array[100];
test()71 void test() {
72 extern int array[];
73 int x = sizeof(array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
74 }
75 int y = sizeof(array);
76 extern int array[];
77 int z = sizeof(array);
78 }
79
80 namespace test8 {
81 extern int array[];
test()82 void test() {
83 extern int array[100];
84 int x = sizeof(array);
85 }
86 int y = sizeof(array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
87 extern int array[];
88 int z = sizeof(array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
89 }
90
91 namespace dependent {
f()92 template<typename T> void f() {
93 extern int arr1[];
94 extern T arr1;
95 extern T arr2;
96 extern int arr2[];
97 static_assert(sizeof(arr1) == 12, "");
98 static_assert(sizeof(arr2) == 12, "");
99
100 // Use a failing test to ensure the type isn't considered dependent.
101 static_assert(sizeof(arr2) == 13, ""); // expected-error {{failed}}
102 }
103
g()104 void g() { f<int[3]>(); } // expected-note {{in instantiation of}}
105
h1()106 template<typename T> void h1() {
107 extern T arr3;
108 {
109 int arr3;
110 {
111 extern int arr3[];
112 // Detected in template definition.
113 (void)sizeof(arr3); // expected-error {{incomplete}}
114 }
115 }
116 }
117
h2()118 template<typename T> void h2() {
119 extern int arr4[3];
120 {
121 int arr4;
122 {
123 extern T arr4;
124 // Detected in template instantiation.
125 (void)sizeof(arr4); // expected-error {{incomplete}}
126 }
127 }
128 }
129
i()130 void i() {
131 h1<int[3]>();
132 h2<int[]>(); // expected-note {{in instantiation of}}
133 }
134
135 int arr5[3];
j()136 template<typename T> void j() {
137 extern T arr5;
138 extern T arr6;
139 (void)sizeof(arr5); // expected-error {{incomplete}}
140 (void)sizeof(arr6); // expected-error {{incomplete}}
141 }
142 int arr6[3];
143
k()144 void k() { j<int[]>(); } // expected-note {{in instantiation of}}
145
l()146 template<typename T, typename U> void l() {
147 extern T arrX; // expected-note {{previous}}
148 extern U arrX; // expected-error {{different type: 'int [4]' vs 'int [3]'}}
149 (void)sizeof(arrX); // expected-error {{incomplete}}
150 }
151
m()152 void m() {
153 l<int[], int[3]>(); // ok
154 l<int[3], int[]>(); // ok
155 l<int[3], int[3]>(); // ok
156 l<int[3], int[4]>(); // expected-note {{in instantiation of}}
157 l<int[], int[]>(); // expected-note {{in instantiation of}}
158 }
159
n()160 template<typename T> void n() {
161 extern T n_var; // expected-error {{redeclaration of 'n_var' with a different type: 'double' vs 'int'}} expected-note {{previous}}
162 extern T n_fn(); // expected-error {{functions that differ only in their return type cannot be overloaded}} expected-note {{previous}}
163 }
164 template void n<int>();
165 template void n<double>(); // expected-note {{in instantiation of}}
166
o()167 template<typename T> void o() {
168 extern T o_var; // expected-note {{previous}}
169 extern T o_fn(); // expected-note {{previous}}
170 }
171 template void o<int>();
172 float o_var; // expected-error {{redefinition of 'o_var' with a different type: 'float' vs 'int'}}
173 float o_fn(); // expected-error {{functions that differ only in their return type cannot be overloaded}}
174
175 int p_var;
176 int p_fn();
p()177 template<typename T> void p() {
178 extern T p_var;
179 extern T p_fn();
180 }
181 }
182
183 namespace use_outside_ns {
184 namespace A {
185 extern int a[3];
186 extern int b[];
187 extern int c[3];
f()188 void f() {
189 extern int a[];
190 extern int b[3];
191 }
x()192 template<typename T> void x() {
193 extern T c;
194 extern T d;
195 }
196 extern int d[3];
197 template void x<int[]>();
198 }
199 int w = sizeof(A::a);
200 int x = sizeof(A::b); // expected-error {{incomplete}}
201 int y = sizeof(A::c);
202 int z = sizeof(A::d);
203 namespace A {
g()204 int g() { return sizeof(a); }
h()205 int h() { return sizeof(b); } // expected-error {{incomplete}}
i()206 int i() { return sizeof(c); }
j()207 int j() { return sizeof(d); }
208 }
209 }
210
211 extern int arr[];
f1()212 void f1() { extern int arr[2]; } // expected-note {{previous}}
f2()213 void f2() { extern int arr[3]; } // expected-error {{different type: 'int [3]' vs 'int [2]'}}
214