Douglas Gregor | e12a11f | 2011-06-29 21:22:02 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -fsyntax-only -verify %s |
Fariborz Jahanian | 7d99e98 | 2010-06-24 18:50:41 +0000 | [diff] [blame] | 2 | |
| 3 | // rdar: // 8125274 |
| 4 | static int a16[]; // expected-warning {{tentative array definition assumed to have one element}} |
| 5 | |
| 6 | void f16(void) { |
| 7 | extern int a16[]; |
| 8 | } |
| 9 | |
Douglas Gregor | e12a11f | 2011-06-29 21:22:02 +0000 | [diff] [blame] | 10 | |
| 11 | // PR10013: Scope of extern declarations extend past enclosing block |
| 12 | extern int PR10013_x; |
| 13 | int 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 | |
Rafael Espindola | 372df45 | 2012-12-17 22:23:47 +0000 | [diff] [blame] | 23 | static int test1_a[]; // expected-warning {{tentative array definition assumed to have one element}} |
| 24 | extern int test1_a[]; |
John McCall | 5b8740f | 2013-04-01 18:34:28 +0000 | [diff] [blame] | 25 | |
| 26 | // rdar://13535367 |
| 27 | void test2declarer() { extern int test2_array[100]; } |
| 28 | extern int test2_array[]; |
| 29 | int test2v = sizeof(test2_array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}} |
| 30 | |
| 31 | void 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 | } |
John McCall | 927b0af | 2013-04-13 00:20:21 +0000 | [diff] [blame] | 36 | |
| 37 | void 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 | } |
John McCall | 088831d | 2013-04-14 08:50:55 +0000 | [diff] [blame] | 45 | |
| 46 | // Test that invalid local extern declarations of library |
| 47 | // builtins behave reasonably. |
| 48 | extern void abort(void); // expected-note 2 {{previous declaration is here}} |
| 49 | extern float *calloc(); // expected-warning {{incompatible redeclaration of library function}} expected-note {{is a builtin}} expected-note 2 {{previous declaration is here}} |
| 50 | void 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 | } |
| 55 | void 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 | } |
| 60 | void test5c() { |
| 61 | void (*_abort)(void) = &abort; |
| 62 | void *(*_malloc)() = &malloc; |
| 63 | float *(*_calloc)() = &calloc; |
| 64 | } |
Richard Smith | dd9459f | 2013-08-13 18:18:50 +0000 | [diff] [blame] | 65 | |
| 66 | void 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 | } |