1 // RUN: %clang_cc1 %s -verify=expected,both -fsyntax-only -Werror=implicit-function-declaration -std=c99
2 // RUN: %clang_cc1 %s -verify=expected,both -fsyntax-only -std=c11
3 // RUN: %clang_cc1 %s -verify=c2x,both -fsyntax-only -std=c2x
4
5 /// -Werror-implicit-function-declaration is a deprecated alias used by many projects.
6 // RUN: %clang_cc1 %s -verify=expected,both -fsyntax-only -Werror-implicit-function-declaration
7
8 // c2x-note@*:* {{'__builtin_va_list' declared here}}
9
10 typedef int int32_t;
11 typedef unsigned char Boolean;
12
13 extern int printf(__const char *__restrict __format, ...); // both-note{{'printf' declared here}}
func(void)14 void func(void) {
15 int32_t *vector[16];
16 const char compDesc[16 + 1];
17 int32_t compCount = 0;
18 if (_CFCalendarDecomposeAbsoluteTimeV(compDesc, vector, compCount)) { // expected-error {{call to undeclared function '_CFCalendarDecomposeAbsoluteTimeV'; ISO C99 and later do not support implicit function declarations}} \
19 expected-note {{previous implicit declaration}} \
20 c2x-error {{use of undeclared identifier '_CFCalendarDecomposeAbsoluteTimeV'}}
21 }
22
23 printg("Hello, World!\n"); // expected-error{{call to undeclared function 'printg'; ISO C99 and later do not support implicit function declarations}} \
24 expected-note{{did you mean 'printf'?}} \
25 c2x-error {{use of undeclared identifier 'printg'; did you mean 'printf'?}}
26
27 __builtin_is_les(1, 3); // expected-error{{use of unknown builtin '__builtin_is_les'}} \
28 c2x-error {{unknown type name '__builtin_is_les'; did you mean '__builtin_va_list'?}} \
29 c2x-error {{expected identifier or '('}} \
30 c2x-error {{expected ')'}} \
31 c2x-note {{to match this '('}}
32 }
_CFCalendarDecomposeAbsoluteTimeV(const char * componentDesc,int32_t ** vector,int32_t count)33 Boolean _CFCalendarDecomposeAbsoluteTimeV(const char *componentDesc, int32_t **vector, int32_t count) { // expected-error {{conflicting types}}
34 return 0;
35 }
36
37
38 // Test the typo-correction callback in Sema::ImplicitlyDefineFunction
39 extern int sformatf(char *str, __const char *__restrict __format, ...); // expected-note{{'sformatf' declared here}}
test_implicit(void)40 void test_implicit(void) {
41 int formats = 0; // c2x-note {{'formats' declared here}}
42 formatd("Hello, World!\n"); // expected-error{{call to undeclared function 'formatd'; ISO C99 and later do not support implicit function declarations}} \
43 expected-note{{did you mean 'sformatf'?}} \
44 c2x-error {{use of undeclared identifier 'formatd'; did you mean 'formats'?}} \
45 c2x-error {{called object type 'int' is not a function or function pointer}}
46 }
47
test_suggestion(void)48 void test_suggestion(void) {
49 bark(); // expected-error {{call to undeclared function 'bark'; ISO C99 and later do not support implicit function declarations}} \
50 c2x-error {{use of undeclared identifier 'bark'}}
51 bork(); // expected-error {{call to undeclared function 'bork'; ISO C99 and later do not support implicit function declarations}} \
52 c2x-error {{use of undeclared identifier 'bork'}}
53 }
54
55 // The following used to cause an assertion from trying to define the implicit
56 // function within a structure scope as opposed to within function or global
57 // scoped.
GH48579_1(void)58 int GH48579_1(void) {
59 struct {
60 int x __attribute__((aligned(({ a(); })))); // expected-error {{call to undeclared function 'a'; ISO C99 and later do not support implicit function declarations}} \
61 c2x-error {{use of undeclared identifier 'a'}} \
62 both-error {{'aligned' attribute requires integer constant}}
63 } x;
64 }
65
GH48579_2(void)66 void GH48579_2(void) {
67 struct S {
68 int array[({ a(); })]; // expected-error {{call to undeclared function 'a'; ISO C99 and later do not support implicit function declarations}} \
69 c2x-error {{use of undeclared identifier 'a'}} \
70 expected-error {{fields must have a constant size: 'variable length array in structure' extension will never be supported}} \
71 c2x-error {{size of array has non-integer type 'void'}}
72 };
73 }
74
75 int GH48579_3 = ({a();}); // both-error {{statement expression not allowed at file scope}}
76 void GH48579_4(int array[({ a(); })]); // both-error {{statement expression not allowed at file scope}}
77
pragma_warning(void)78 void pragma_warning(void) {
79 #pragma clang diagnostic warning "-Wimplicit-function-declaration"
80 bark(); // expected-warning {{call to undeclared function 'bark'; ISO C99 and later do not support implicit function declarations}} \
81 c2x-error {{use of undeclared identifier 'bark'}}
82 }
83
pragma_error(void)84 void pragma_error(void) {
85 #pragma clang diagnostic error "-Wimplicit-function-declaration"
86 bark(); // expected-error {{call to undeclared function 'bark'; ISO C99 and later do not support implicit function declarations}} \
87 c2x-error {{use of undeclared identifier 'bark'}}
88 }
89
pragma_ignored(void)90 void pragma_ignored(void) {
91 #pragma clang diagnostic ignored "-Wimplicit-function-declaration"
92 bark(); // c2x-error {{use of undeclared identifier 'bark'}}
93 }
94