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In GCC, `#pragma GCC diagnostic warning "-Wfoo"` overrides command-line `-Werror=foo` and errors that can become warnings (pedwarn with -pedantic-errors and permerror). ``` #pragma GCC diagnostic warning "-Wnarrowing" int x = {4.2}; #pragma GCC diagnostic warning "-Wundef" #if FOO #endif // gcc -c -Werror=undef -Werror=narrowing => two warnings ``` These diagnostics are similar to our Warning/ExtWarn/Extension diagnostics with DefaultError. This patch ports the behavior to Clang. Fix #93474 Pull Request: https://github.com/llvm/llvm-project/pull/93647
94 lines
5.2 KiB
C
94 lines
5.2 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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void pragma_warning(void) {
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#pragma clang diagnostic warning "-Wimplicit-function-declaration"
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bark(); // expected-warning {{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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}
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void pragma_error(void) {
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#pragma clang diagnostic error "-Wimplicit-function-declaration"
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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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}
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void pragma_ignored(void) {
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#pragma clang diagnostic ignored "-Wimplicit-function-declaration"
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bark(); // c2x-error {{use of undeclared identifier 'bark'}}
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}
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