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