1// RUN: %clang_cc1 -fsyntax-only -verify %s
2
3// rdar: // 8125274
4static int a16[];  // expected-warning {{tentative array definition assumed to have one element}}
5
6void f16(void) {
7    extern int a16[];
8}
9
10
11// PR10013: Scope of extern declarations extend past enclosing block
12extern int PR10013_x;
13int PR10013(void) {
14  int *PR10013_x = 0;
15  {
16    extern int PR10013_x;
17    extern int PR10013_x;
18  }
19
20  return PR10013_x; // expected-warning{{incompatible pointer to integer conversion}}
21}
22
23static int test1_a[]; // expected-warning {{tentative array definition assumed to have one element}}
24extern int test1_a[];
25
26// rdar://13535367
27void test2declarer() { extern int test2_array[100]; }
28extern int test2_array[];
29int test2v = sizeof(test2_array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
30
31void test3declarer() {
32  { extern int test3_array[100]; }
33  extern int test3_array[];
34  int x = sizeof(test3_array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
35}
36
37void test4() {
38  extern int test4_array[];
39  {
40    extern int test4_array[100];
41    int x = sizeof(test4_array); // fine
42  }
43  int x = sizeof(test4_array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
44}
45
46// Test that invalid local extern declarations of library
47// builtins behave reasonably.
48extern void abort(void); // expected-note 2 {{previous declaration is here}}
49extern float *calloc(); // expected-warning {{incompatible redeclaration of library function}} expected-note {{is a builtin}} expected-note 2 {{previous declaration is here}}
50void test5a() {
51  int abort(); // expected-error {{conflicting types}}
52  float *malloc(); // expected-warning {{incompatible redeclaration of library function}} expected-note 2 {{is a builtin}}
53  int *calloc(); // expected-error {{conflicting types}}
54}
55void test5b() {
56  int abort(); // expected-error {{conflicting types}}
57  float *malloc(); // expected-warning {{incompatible redeclaration of library function}}
58  int *calloc(); // expected-error {{conflicting types}}
59}
60void test5c() {
61  void (*_abort)(void) = &abort;
62  void *(*_malloc)() = &malloc;
63  float *(*_calloc)() = &calloc;
64}
65
66void test6() {
67  extern int test6_array1[100];
68  extern int test6_array2[100];
69  void test6_fn1(int*);
70  void test6_fn2(int*);
71  {
72    // Types are only merged from visible declarations.
73    char test6_array2;
74    char test6_fn2;
75    {
76      extern int test6_array1[];
77      extern int test6_array2[];
78      (void)sizeof(test6_array1); // ok
79      (void)sizeof(test6_array2); // expected-error {{incomplete type}}
80
81      void test6_fn1();
82      void test6_fn2();
83      test6_fn1(1.2); // expected-error {{passing 'double' to parameter of incompatible type 'int *'}}
84      // FIXME: This is valid, but we should warn on it.
85      test6_fn2(1.2);
86    }
87  }
88}
89