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24ad121582
user interface and documentation, and update __cplusplus for C++20. WG21 considers the C++20 standard to be finished (even though it still has some more steps to pass through in the ISO process). The old flag names are accepted for compatibility, as usual, and we still have lots of references to C++2a in comments and identifiers; those can be cleaned up separately.
74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
// RUN: %clang_cc1 -std=c++17 %s -verify
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// RUN: %clang_cc1 -std=c++20 %s -verify
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// RUN: %clang_cc1 -std=c++20 %s -verify -Wc++17-compat -DCOMPAT
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//
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// RUN: %clang_cc1 -std=c++17 %s -E -o - | FileCheck %s --check-prefix=CXX17
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// RUN: %clang_cc1 -std=c++20 %s -E -o - | FileCheck %s --check-prefix=CXX20
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namespace N {
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struct A {};
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void operator<=(A, A);
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#if __cplusplus > 201703L
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void operator<=>(A, A);
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#ifdef COMPAT
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// expected-warning@-2 {{'<=>' operator is incompatible with C++ standards before C++20}}
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#endif
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#endif
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template<auto> struct X {};
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X<operator<=>
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#if __cplusplus <= 201703L
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// expected-warning@-2 {{'<=>' is a single token in C++20; add a space to avoid a change in behavior}}
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#else
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>
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#endif
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#ifdef COMPAT
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// expected-warning@-7 {{'<=>' operator is incompatible with C++ standards before C++20}}
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#endif
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x;
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}
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// <=> can be formed by pasting other comparison operators.
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#if __cplusplus > 201703L
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#define STR(x) #x
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#define STR_EXPANDED(x) STR(x)
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#define PASTE(x, y) x ## y
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constexpr char a[] = STR_EXPANDED(PASTE(<, =>));
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constexpr char b[] = STR_EXPANDED(PASTE(<=, >));
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static_assert(__builtin_strcmp(a, "<=>") == 0);
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static_assert(__builtin_strcmp(b, "<=>") == 0);
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#endif
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// -E must not accidentally form a <=> token.
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// CXX17: preprocess1: < =>
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// CXX17: preprocess2: <=>
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// CXX17: preprocess3: < =>
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// CXX17: preprocess4: <=>=
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// CXX17: preprocess5: <=>>
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// CXX17: preprocess6: <=>>=
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// CXX17: preprocess7: <=>
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// CXX17: preprocess8: <=>=
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//
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// CXX20: preprocess1: < =>
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// CXX20: preprocess2: <= >
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// CXX20: preprocess3: < =>
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// CXX20: preprocess4: <= >=
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// CXX20: preprocess5: <= >>
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// CXX20: preprocess6: <= >>=
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// CXX20: preprocess7: <=>
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// CXX20: preprocess8: <=>=
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#define ID(x) x
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[[some_vendor::some_attribute( // expected-warning {{unknown attribute}}
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preprocess1: ID(<)ID(=>),
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preprocess2: ID(<=)ID(>),
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preprocess3: ID(<)ID(=)ID(>),
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preprocess4: ID(<=)ID(>=),
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preprocess5: ID(<=)ID(>>),
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preprocess6: ID(<=)ID(>>=),
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preprocess7: ID(<=>) // expected-warning 0-1{{'<=>'}}
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preprocess8: ID(<=>=) // expected-warning 0-1{{'<=>'}}
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)]];
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