74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
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// 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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