| 1 | // RUN: %clang_cc1 -fsyntax-only -std=c++17 -Wc++2a-compat-pedantic -verify %s |
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| 2 | // RUN: %clang_cc1 -fsyntax-only -std=c++2a -pedantic -verify %s |
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| 3 | |
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| 4 | struct A { // expected-note 0+{{candidate}} |
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| 5 | A() = default; // expected-note 0+{{candidate}} |
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| 6 | int x, y; |
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| 7 | }; |
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| 8 | A a1 = {1, 2}; |
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| 9 | #if __cplusplus <= 201703L |
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| 10 | // expected-warning@-2 {{aggregate initialization of type 'A' with user-declared constructors is incompatible with C++2a}} |
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| 11 | #else |
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| 12 | // expected-error@-4 {{no matching constructor}} |
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| 13 | #endif |
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| 14 | A a2 = {}; |
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| 15 | |
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| 16 | struct B : A { A a; }; |
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| 17 | B b1 = {{}, {}}; // ok |
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| 18 | B b2 = {1, 2, 3, 4}; |
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| 19 | #if __cplusplus <= 201703L |
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| 20 | // expected-warning@-2 2{{aggregate initialization of type 'A' with user-declared constructors is incompatible with C++2a}} |
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| 21 | #else |
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| 22 | // expected-error@-4 2{{no viable conversion from 'int' to 'A'}} |
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| 23 | #endif |
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| 24 | |
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| 25 | // Essentially any use of a u8 string literal in C++<=17 is broken by C++20. |
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| 26 | // Just warn on all such string literals. |
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| 27 | struct string { string(const char*); }; // expected-note 0+{{candidate}} |
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| 28 | char u8arr[] = u8"hello"; |
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| 29 | const char *u8ptr = "wo" u8"rld"; |
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| 30 | string u8str = u8"test" u8"test"; |
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| 31 | #if __cplusplus <= 201703L |
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| 32 | // expected-warning@-4 {{type of UTF-8 string literal will change}} expected-note@-4 {{remove 'u8' prefix}} |
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| 33 | // expected-warning@-4 {{type of UTF-8 string literal will change}} expected-note@-4 {{remove 'u8' prefix}} |
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| 34 | // expected-warning@-4 {{type of UTF-8 string literal will change}} expected-note@-4 {{remove 'u8' prefix}} |
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| 35 | #else |
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| 36 | // expected-error@-8 {{ISO C++20 does not permit initialization of char array with UTF-8 string literal}} |
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| 37 | // expected-error@-8 {{cannot initialize a variable of type 'const char *' with an lvalue of type 'const char8_t [6]'}} |
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| 38 | // expected-error@-8 {{no viable conversion from 'const char8_t [9]' to 'string'}} |
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| 39 | #endif |
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| 40 | |
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