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9955f14aaf
WG14 has elected to remove support for K&R C functions in C2x. The feature was introduced into C89 already deprecated, so after this long of a deprecation period, the committee has made an empty parameter list mean the same thing in C as it means in C++: the function accepts no arguments exactly as if the function were written with (void) as the parameter list. This patch implements WG14 N2841 No function declarators without prototypes (http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2841.htm) and WG14 N2432 Remove support for function definitions with identifier lists (http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2432.pdf). It also adds The -fno-knr-functions command line option to opt into this behavior in other language modes. Differential Revision: https://reviews.llvm.org/D123955
44 lines
1.8 KiB
C
44 lines
1.8 KiB
C
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -Wno-strict-prototypes -fsyntax-only -verify -std=c2x %s
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struct S {};
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struct S * [[clang::address_space(1)]] Foo;
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enum [[clang::enum_extensibility(open)]] EnumOpen {
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C0 = 1, C1 = 10
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};
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enum [[clang::flag_enum]] EnumFlag {
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D0 = 1, D1 = 8
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};
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[[clang::overloadable]] void foo(void *c);
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[[clang::overloadable]] void foo(char *c);
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void context_okay(void *context [[clang::swift_context]]) [[clang::swiftcall]];
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void context_okay2(void *context [[clang::swift_context]], void *selfType, char **selfWitnessTable) [[clang::swiftcall]];
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void context_async_okay(void *context [[clang::swift_async_context]]) [[clang::swiftasynccall]];
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void context_async_okay2(void *context [[clang::swift_async_context]], void *selfType, char **selfWitnessTable) [[clang::swiftasynccall]];
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[[clang::ownership_returns(foo)]] void *f1(void);
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[[clang::ownership_returns(foo)]] void *f2();
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[[clang::unavailable("not available - replaced")]] void foo2(void); // expected-note {{'foo2' has been explicitly marked unavailable here}}
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void bar(void) {
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foo2(); // expected-error {{'foo2' is unavailable: not available - replaced}}
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}
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[[nodiscard]] int without_underscores(void);
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[[__nodiscard__]] int underscores(void);
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// Match GCC's behavior for C attributes as well.
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[[gnu::constructor]] void ctor_func(void);
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[[gnu::destructor]] void dtor_func(void);
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[[gnu::hot]] void hot_func(void);
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[[__gnu__::hot]] void hot_func2(void);
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[[gnu::__hot__]] void hot_func3(void);
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[[__gnu__::__hot__]] void hot_func4(void);
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// Note how not all GCC attributes are supported in C.
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[[gnu::abi_tag("")]] void abi_func(void); // expected-warning {{unknown attribute 'abi_tag' ignored}}
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struct S s [[gnu::init_priority(1)]]; // expected-warning {{unknown attribute 'init_priority' ignored}}
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