1 // Test diagnostics for ill-formed STL <compare> headers.
2 
3 // RUN: %clang_cc1 -triple x86_64-apple-darwin -fcxx-exceptions -fsyntax-only -pedantic -verify -Wsign-compare -std=c++2a %s
4 // RUN: %clang_cc1 -triple x86_64-apple-darwin -fcxx-exceptions -fsyntax-only -pedantic -verify -Wsign-compare -std=c++2a -DTEST_TRIVIAL=1 %s
5 
6 #ifndef TEST_TRIVIAL
compare_not_found_test()7 void compare_not_found_test() {
8   // expected-error@+1 {{cannot use builtin operator '<=>' because type 'std::partial_ordering' was not found; include <compare>}}
9   (void)(0.0 <=> 42.123);
10 }
11 
12 struct deduction_compare_not_found {
13   // expected-error@+1 {{cannot default 'operator<=>' because type 'std::strong_ordering' was not found; include <compare>}}
14   friend auto operator<=>(const deduction_compare_not_found&, const deduction_compare_not_found&) = default;
15 };
16 
17 struct comparable {
18   int operator<=>(comparable);
19 };
20 struct default_compare_not_found {
21   // expected-error@+1 {{cannot default 'operator<=>' because type 'std::strong_ordering' was not found; include <compare>}}
22   friend int operator<=>(const default_compare_not_found&, const default_compare_not_found&) = default;
23 };
24 bool b = default_compare_not_found() < default_compare_not_found(); // expected-note {{first required here}}
25 
26 namespace std {
27 inline namespace __1 {
28 struct partial_ordering; // expected-note {{forward declaration}}
29 }
30 } // namespace std
31 
compare_incomplete_test()32 auto compare_incomplete_test() {
33   // expected-error@+1 {{incomplete type 'std::partial_ordering' where a complete type is required}}
34   return (-1.2 <=> 123.0);
35 }
36 
37 namespace std {
38 inline namespace __1 {
39 struct partial_ordering {
40   unsigned value;
41 };
42 } // namespace __1
43 } // namespace std
44 
missing_member_test()45 auto missing_member_test() {
46   // expected-error@+1 {{standard library implementation of 'std::partial_ordering' is not supported; member 'equivalent' is missing}}
47   return (1.0 <=> 1.0);
48 }
49 
50 namespace std {
51 inline namespace __1 {
52 struct strong_ordering {
53   long long value;
54   static const strong_ordering equal; // expected-note {{declared here}}
55 };
56 } // namespace __1
57 } // namespace std
58 
test_non_constexpr_var()59 auto test_non_constexpr_var() {
60   // expected-error@+1 {{standard library implementation of 'std::strong_ordering' is not supported; member 'equal' does not have expected form}}
61   return (1 <=> 0);
62 }
63 
64 #else
65 
66 namespace std {
67 inline namespace __1 {
68 struct strong_ordering {
69   char value = 0;
70   constexpr strong_ordering() = default;
71   // non-trivial
strong_orderingstd::__1::strong_ordering72   constexpr strong_ordering(strong_ordering const &other) : value(other.value) {}
73 };
74 } // namespace __1
75 } // namespace std
76 
test_non_trivial(int LHS,int RHS)77 auto test_non_trivial(int LHS, int RHS) {
78   // expected-error@+1 {{standard library implementation of 'std::strong_ordering' is not supported; the type is not trivially copyable}}
79   return LHS <=> RHS;
80 }
81 
82 #endif
83