63342ae4b8
When implicitly defining a function in C, we would try to find an appropriate declaration context for the function to be declared within. However, we did not account for GNU statement expressions, which masquerade as a compound statement and can be used in other contexts such as within structure member declarations. Fixes https://github.com/llvm/llvm-project/issues/48579
77 lines
4.5 KiB
C
77 lines
4.5 KiB
C
// RUN: %clang_cc1 %s -verify=expected,both -fsyntax-only -Werror=implicit-function-declaration -std=c99
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// RUN: %clang_cc1 %s -verify=expected,both -fsyntax-only -std=c11
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// RUN: %clang_cc1 %s -verify=c2x,both -fsyntax-only -std=c2x
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/// -Werror-implicit-function-declaration is a deprecated alias used by many projects.
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// RUN: %clang_cc1 %s -verify=expected,both -fsyntax-only -Werror-implicit-function-declaration
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// c2x-note@*:* {{'__builtin_va_list' declared here}}
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typedef int int32_t;
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typedef unsigned char Boolean;
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extern int printf(__const char *__restrict __format, ...); // both-note{{'printf' declared here}}
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void func(void) {
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int32_t *vector[16];
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const char compDesc[16 + 1];
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int32_t compCount = 0;
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if (_CFCalendarDecomposeAbsoluteTimeV(compDesc, vector, compCount)) { // expected-error {{call to undeclared function '_CFCalendarDecomposeAbsoluteTimeV'; ISO C99 and later do not support implicit function declarations}} \
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expected-note {{previous implicit declaration}} \
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c2x-error {{use of undeclared identifier '_CFCalendarDecomposeAbsoluteTimeV'}}
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}
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printg("Hello, World!\n"); // expected-error{{call to undeclared function 'printg'; ISO C99 and later do not support implicit function declarations}} \
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expected-note{{did you mean 'printf'?}} \
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c2x-error {{use of undeclared identifier 'printg'; did you mean 'printf'?}}
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__builtin_is_les(1, 3); // expected-error{{use of unknown builtin '__builtin_is_les'}} \
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c2x-error {{unknown type name '__builtin_is_les'; did you mean '__builtin_va_list'?}} \
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c2x-error {{expected identifier or '('}} \
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c2x-error {{expected ')'}} \
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c2x-note {{to match this '('}}
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}
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Boolean _CFCalendarDecomposeAbsoluteTimeV(const char *componentDesc, int32_t **vector, int32_t count) { // expected-error {{conflicting types}}
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return 0;
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}
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// Test the typo-correction callback in Sema::ImplicitlyDefineFunction
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extern int sformatf(char *str, __const char *__restrict __format, ...); // expected-note{{'sformatf' declared here}}
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void test_implicit(void) {
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int formats = 0; // c2x-note {{'formats' declared here}}
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formatd("Hello, World!\n"); // expected-error{{call to undeclared function 'formatd'; ISO C99 and later do not support implicit function declarations}} \
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expected-note{{did you mean 'sformatf'?}} \
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c2x-error {{use of undeclared identifier 'formatd'; did you mean 'formats'?}} \
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c2x-error {{called object type 'int' is not a function or function pointer}}
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}
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void test_suggestion(void) {
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bark(); // expected-error {{call to undeclared function 'bark'; ISO C99 and later do not support implicit function declarations}} \
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c2x-error {{use of undeclared identifier 'bark'}}
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bork(); // expected-error {{call to undeclared function 'bork'; ISO C99 and later do not support implicit function declarations}} \
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c2x-error {{use of undeclared identifier 'bork'}}
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}
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// The following used to cause an assertion from trying to define the implicit
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// function within a structure scope as opposed to within function or global
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// scoped.
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int GH48579_1(void) {
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struct {
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int x __attribute__((aligned(({ a(); })))); // expected-error {{call to undeclared function 'a'; ISO C99 and later do not support implicit function declarations}} \
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c2x-error {{use of undeclared identifier 'a'}} \
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both-error {{'aligned' attribute requires integer constant}}
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} x;
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}
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void GH48579_2(void) {
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struct S {
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int array[({ a(); })]; // expected-error {{call to undeclared function 'a'; ISO C99 and later do not support implicit function declarations}} \
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c2x-error {{use of undeclared identifier 'a'}} \
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expected-error {{fields must have a constant size: 'variable length array in structure' extension will never be supported}} \
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c2x-error {{size of array has non-integer type 'void'}}
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};
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}
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int GH48579_3 = ({a();}); // both-error {{statement expression not allowed at file scope}}
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void GH48579_4(int array[({ a(); })]); // both-error {{statement expression not allowed at file scope}}
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