522934da1f
GCC 10.1 introduced support for the [[]] style spelling of attributes in C mode. Similar to how GCC supports __attribute__((foo)) as [[gnu::foo]] in C++ mode, it now supports the same spelling in C mode as well. This patch makes a change in Clang so that when you use the GCC attribute spelling, the attribute is automatically available in all three spellings by default. However, like Clang, GCC has some attributes it only recognizes in C++ mode (specifically, abi_tag and init_priority), which this patch also honors.
42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -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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void foo(void *c) [[clang::overloadable]];
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void foo(char *c) [[clang::overloadable]];
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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 *f1(void) [[clang::ownership_returns(foo)]];
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void *f2() [[clang::ownership_returns(foo)]]; // expected-warning {{'ownership_returns' attribute only applies to non-K&R-style functions}}
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void foo2(void) [[clang::unavailable("not available - replaced")]]; // 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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