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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.
69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -std=c++17 -Wc++20-compat-pedantic -verify %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++20 -pedantic -verify %s
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struct A { // expected-note 0+{{candidate}}
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A() = default; // expected-note 0+{{candidate}}
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int x, y;
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};
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A a1 = {1, 2};
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#if __cplusplus <= 201703L
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// expected-warning@-2 {{aggregate initialization of type 'A' with user-declared constructors is incompatible with C++20}}
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#else
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// expected-error@-4 {{no matching constructor}}
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#endif
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A a2 = {};
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struct B : A { A a; };
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B b1 = {{}, {}}; // ok
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B b2 = {1, 2, 3, 4};
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#if __cplusplus <= 201703L
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// expected-warning@-2 2{{aggregate initialization of type 'A' with user-declared constructors is incompatible with C++20}}
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#else
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// expected-error@-4 2{{no viable conversion from 'int' to 'A'}}
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#endif
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// Essentially any use of a u8 string literal in C++<=17 is broken by C++20.
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// Just warn on all such string literals.
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struct string { string(const char*); }; // expected-note 0+{{candidate}}
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char u8arr[] = u8"hello";
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const char *u8ptr = "wo" u8"rld";
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string u8str = u8"test" u8"test";
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#if __cplusplus <= 201703L
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// expected-warning@-4 {{type of UTF-8 string literal will change}} expected-note@-4 {{remove 'u8' prefix}}
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// expected-warning@-4 {{type of UTF-8 string literal will change}} expected-note@-4 {{remove 'u8' prefix}}
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// expected-warning@-4 {{type of UTF-8 string literal will change}} expected-note@-4 {{remove 'u8' prefix}}
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#else
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// expected-error@-8 {{ISO C++20 does not permit initialization of char array with UTF-8 string literal}}
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// expected-error@-8 {{cannot initialize a variable of type 'const char *' with an lvalue of type 'const char8_t [6]'}}
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// expected-error@-8 {{no viable conversion from 'const char8_t [9]' to 'string'}}
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#endif
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template<bool b>
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struct C {
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explicit(C)(int);
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};
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#if __cplusplus <= 201703L
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// expected-warning@-3 {{this expression will be parsed as explicit(bool) in C++20}}
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#if defined(__cpp_conditional_explicit)
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#error "the feature test macro __cpp_conditional_explicit isn't correct"
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#endif
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#else
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// expected-error@-8 {{does not refer to a value}}
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// expected-error@-9 {{expected member name or ';'}}
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// expected-error@-10 {{expected ')'}}
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// expected-note@-12 {{declared here}}
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// expected-note@-12 {{to match this '('}}
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#if !defined(__cpp_conditional_explicit) || __cpp_conditional_explicit != 201806L
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#error "the feature test macro __cpp_conditional_explicit isn't correct"
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#endif
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#endif
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auto l = []() consteval {};
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int consteval();
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#if __cplusplus <= 201703L
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// expected-warning@-3 {{'consteval' is a keyword in C++20}}
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// expected-error@-4 {{expected body of lambda expression}}
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#else
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// expected-error@-5 {{expected unqualified-id}}
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#endif
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