1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wc++98-compat -verify %s
2 // RUN: %clang_cc1 -fsyntax-only -std=c++14 -Wc++98-compat -verify %s -DCXX14COMPAT
3 
4 namespace std {
5   struct type_info;
6   using size_t = decltype(sizeof(0)); // expected-warning {{decltype}} expected-warning {{alias}}
7   template<typename T> struct initializer_list {
8     initializer_list(T*, size_t);
9     T *p;
10     size_t n;
11     T *begin();
12     T *end();
13   };
14 }
15 
16 template<typename ...T>  // expected-warning {{variadic templates are incompatible with C++98}}
17 class Variadic1 {};
18 
19 template<template<typename> class ...T>  // expected-warning {{variadic templates are incompatible with C++98}}
20 class Variadic2 {};
21 
22 template<int ...I>  // expected-warning {{variadic templates are incompatible with C++98}}
23 class Variadic3 {};
24 
25 alignas(8) int with_alignas; // expected-warning {{'alignas' is incompatible with C++98}}
26 int with_attribute [[ ]]; // expected-warning {{C++11 attribute syntax is incompatible with C++98}}
27 
28 void Literals() {
29   (void)u8"str"; // expected-warning {{unicode literals are incompatible with C++98}}
30   (void)u"str"; // expected-warning {{unicode literals are incompatible with C++98}}
31   (void)U"str"; // expected-warning {{unicode literals are incompatible with C++98}}
32   (void)u'x'; // expected-warning {{unicode literals are incompatible with C++98}}
33   (void)U'x'; // expected-warning {{unicode literals are incompatible with C++98}}
34 
35   (void)u8R"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
36   (void)uR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
37   (void)UR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
38   (void)R"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
39   (void)LR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
40 }
41 
42 template<typename T> struct S {};
43 namespace TemplateParsing {
44   S<::S<void> > s; // expected-warning {{'<::' is treated as digraph '<:' (aka '[') followed by ':' in C++98}}
45   S< ::S<void>> t; // expected-warning {{consecutive right angle brackets are incompatible with C++98 (use '> >')}}
46 }
47 
48 void Lambda() {
49   []{}(); // expected-warning {{lambda expressions are incompatible with C++98}}
50 }
51 
52 struct Ctor {
53   Ctor(int, char);
54   Ctor(double, long);
55 };
56 struct InitListCtor {
57   InitListCtor(std::initializer_list<bool>);
58 };
59 
60 int InitList(int i = {}) { // expected-warning {{generalized initializer lists are incompatible with C++98}} \
61                            // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
62   (void)new int {}; // expected-warning {{generalized initializer lists are incompatible with C++98}} \
63                     // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
64   (void)int{}; // expected-warning {{generalized initializer lists are incompatible with C++98}} \
65                // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
66   int x { 0 }; // expected-warning {{generalized initializer lists are incompatible with C++98}}
67   S<int> s = {}; // ok, aggregate
68   s = {}; // expected-warning {{generalized initializer lists are incompatible with C++98}}
69   std::initializer_list<int> xs = { 1, 2, 3 }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}}
70   auto ys = { 1, 2, 3 }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}} \
71                          // expected-warning {{'auto' type specifier is incompatible with C++98}}
72   Ctor c1 = { 1, 2 }; // expected-warning {{constructor call from initializer list is incompatible with C++98}}
73   Ctor c2 = { 3.0, 4l }; // expected-warning {{constructor call from initializer list is incompatible with C++98}}
74   InitListCtor ilc = { true, false }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}}
75   const int &r = { 0 }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}}
76   struct { int a; const int &r; } rr = { 0, {0} }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}}
77   return { 0 }; // expected-warning {{generalized initializer lists are incompatible with C++98}}
78 }
79 struct DelayedDefaultArgumentParseInitList {
80   void f(int i = {1}) { // expected-warning {{generalized initializer lists are incompatible with C++98}}
81   }
82 };
83 
84 int operator"" _hello(const char *); // expected-warning {{literal operators are incompatible with C++98}}
85 
86 enum EnumFixed : int { // expected-warning {{enumeration types with a fixed underlying type are incompatible with C++98}}
87 };
88 
89 enum class EnumScoped { // expected-warning {{scoped enumerations are incompatible with C++98}}
90 };
91 
92 void Deleted() = delete; // expected-warning {{deleted function definitions are incompatible with C++98}}
93 struct Defaulted {
94   Defaulted() = default; // expected-warning {{defaulted function definitions are incompatible with C++98}}
95 };
96 
97 int &&RvalueReference = 0; // expected-warning {{rvalue references are incompatible with C++98}}
98 struct RefQualifier {
99   void f() &; // expected-warning {{reference qualifiers on functions are incompatible with C++98}}
100 };
101 
102 auto f() -> int; // expected-warning {{trailing return types are incompatible with C++98}}
103 
104 void RangeFor() {
105   int xs[] = {1, 2, 3};
106   for (int &a : xs) { // expected-warning {{range-based for loop is incompatible with C++98}}
107   }
108   for (auto &b : {1, 2, 3}) {
109   // expected-warning@-1 {{range-based for loop is incompatible with C++98}}
110   // expected-warning@-2 {{'auto' type specifier is incompatible with C++98}}
111   // expected-warning@-3 {{initialization of initializer_list object is incompatible with C++98}}
112   // expected-warning@-4 {{reference initialized from initializer list is incompatible with C++98}}
113   }
114   struct Agg { int a, b; } const &agg = { 1, 2 }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}}
115 }
116 
117 struct InClassInit {
118   int n = 0; // expected-warning {{in-class initialization of non-static data members is incompatible with C++98}}
119 };
120 
121 struct OverrideControlBase {
122   virtual void f();
123   virtual void g();
124 };
125 struct OverrideControl final : OverrideControlBase { // expected-warning {{'final' keyword is incompatible with C++98}}
126   virtual void f() override; // expected-warning {{'override' keyword is incompatible with C++98}}
127   virtual void g() final; // expected-warning {{'final' keyword is incompatible with C++98}}
128 };
129 
130 using AliasDecl = int; // expected-warning {{alias declarations are incompatible with C++98}}
131 template<typename T> using AliasTemplate = T; // expected-warning {{alias declarations are incompatible with C++98}}
132 
133 inline namespace InlineNS { // expected-warning {{inline namespaces are incompatible with C++98}}
134 }
135 
136 auto auto_deduction = 0; // expected-warning {{'auto' type specifier is incompatible with C++98}}
137 int *p = new auto(0); // expected-warning {{'auto' type specifier is incompatible with C++98}}
138 
139 const int align_of = alignof(int); // expected-warning {{alignof expressions are incompatible with C++98}}
140 char16_t c16 = 0; // expected-warning {{'char16_t' type specifier is incompatible with C++98}}
141 char32_t c32 = 0; // expected-warning {{'char32_t' type specifier is incompatible with C++98}}
142 constexpr int const_expr = 0; // expected-warning {{'constexpr' specifier is incompatible with C++98}}
143 decltype(const_expr) decl_type = 0; // expected-warning {{'decltype' type specifier is incompatible with C++98}}
144 __decltype(const_expr) decl_type2 = 0; // ok
145 void no_except() noexcept; // expected-warning {{noexcept specifications are incompatible with C++98}}
146 bool no_except_expr = noexcept(1 + 1); // expected-warning {{noexcept expressions are incompatible with C++98}}
147 void *null = nullptr; // expected-warning {{'nullptr' is incompatible with C++98}}
148 static_assert(true, "!"); // expected-warning {{static_assert declarations are incompatible with C++98}}
149 
150 struct InhCtorBase {
151   InhCtorBase(int);
152 };
153 struct InhCtorDerived : InhCtorBase {
154   using InhCtorBase::InhCtorBase; // expected-warning {{inheriting constructors are incompatible with C++98}}
155 };
156 
157 struct FriendMember {
158   static void MemberFn();
159   friend void FriendMember::MemberFn(); // expected-warning {{friend declaration naming a member of the declaring class is incompatible with C++98}}
160 };
161 
162 struct DelegCtor {
163   DelegCtor(int) : DelegCtor() {} // expected-warning {{delegating constructors are incompatible with C++98}}
164   DelegCtor();
165 };
166 
167 template<int n = 0> void DefaultFuncTemplateArg(); // expected-warning {{default template arguments for a function template are incompatible with C++98}}
168 
169 template<typename T> int TemplateFn(T) { return 0; }
170 void LocalTemplateArg() {
171   struct S {};
172   TemplateFn(S()); // expected-warning {{local type 'S' as template argument is incompatible with C++98}}
173 }
174 struct {} obj_of_unnamed_type; // expected-note {{here}}
175 int UnnamedTemplateArg = TemplateFn(obj_of_unnamed_type); // expected-warning {{unnamed type as template argument is incompatible with C++98}}
176 
177 namespace RedundantParensInAddressTemplateParam {
178   int n;
179   template<int*p> struct S {};
180   S<(&n)> s; // expected-warning {{redundant parentheses surrounding address non-type template argument are incompatible with C++98}}
181   S<(((&n)))> t; // expected-warning {{redundant parentheses surrounding address non-type template argument are incompatible with C++98}}
182 }
183 
184 namespace TemplateSpecOutOfScopeNs {
185   template<typename T> struct S {}; // expected-note {{here}}
186 }
187 template<> struct TemplateSpecOutOfScopeNs::S<char> {}; // expected-warning {{class template specialization of 'S' outside namespace 'TemplateSpecOutOfScopeNs' is incompatible with C++98}}
188 
189 struct Typename {
190   template<typename T> struct Inner {};
191 };
192 typename ::Typename TypenameOutsideTemplate(); // expected-warning {{use of 'typename' outside of a template is incompatible with C++98}}
193 Typename::template Inner<int> TemplateOutsideTemplate(); // expected-warning {{use of 'template' keyword outside of a template is incompatible with C++98}}
194 
195 struct TrivialButNonPOD {
196   int f(int);
197 private:
198   int k;
199 };
200 void Ellipsis(int n, ...);
201 void TrivialButNonPODThroughEllipsis() {
202   Ellipsis(1, TrivialButNonPOD()); // expected-warning {{passing object of trivial but non-POD type 'TrivialButNonPOD' through variadic function is incompatible with C++98}}
203 }
204 
205 struct HasExplicitConversion {
206   explicit operator bool(); // expected-warning {{explicit conversion functions are incompatible with C++98}}
207 };
208 
209 struct Struct {};
210 enum Enum { enum_val = 0 };
211 struct BadFriends {
212   friend enum ::Enum; // expected-warning {{befriending enumeration type 'enum ::Enum' is incompatible with C++98}}
213   friend int; // expected-warning {{non-class friend type 'int' is incompatible with C++98}}
214   friend Struct; // expected-warning {{befriending 'Struct' without 'struct' keyword is incompatible with C++98}}
215 };
216 
217 int n = {}; // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
218 
219 class PrivateMember {
220   struct ImPrivate {};
221 };
222 template<typename T> typename T::ImPrivate SFINAEAccessControl(T t) { // expected-warning {{substitution failure due to access control is incompatible with C++98}}
223   return typename T::ImPrivate();
224 }
225 int SFINAEAccessControl(...) { return 0; }
226 int CheckSFINAEAccessControl = SFINAEAccessControl(PrivateMember()); // expected-note {{while substituting deduced template arguments into function template 'SFINAEAccessControl' [with T = PrivateMember]}}
227 
228 namespace UnionOrAnonStructMembers {
229   struct NonTrivCtor {
230     NonTrivCtor(); // expected-note 2{{user-provided default constructor}}
231   };
232   struct NonTrivCopy {
233     NonTrivCopy(const NonTrivCopy&); // expected-note 2{{user-provided copy constructor}}
234   };
235   struct NonTrivDtor {
236     ~NonTrivDtor(); // expected-note 2{{user-provided destructor}}
237   };
238   union BadUnion {
239     NonTrivCtor ntc; // expected-warning {{union member 'ntc' with a non-trivial constructor is incompatible with C++98}}
240     NonTrivCopy ntcp; // expected-warning {{union member 'ntcp' with a non-trivial copy constructor is incompatible with C++98}}
241     NonTrivDtor ntd; // expected-warning {{union member 'ntd' with a non-trivial destructor is incompatible with C++98}}
242   };
243   struct Wrap {
244     struct {
245       NonTrivCtor ntc; // expected-warning {{anonymous struct member 'ntc' with a non-trivial constructor is incompatible with C++98}}
246       NonTrivCopy ntcp; // expected-warning {{anonymous struct member 'ntcp' with a non-trivial copy constructor is incompatible with C++98}}
247       NonTrivDtor ntd; // expected-warning {{anonymous struct member 'ntd' with a non-trivial destructor is incompatible with C++98}}
248     };
249   };
250   union WithStaticDataMember {
251     static constexpr double d = 0.0; // expected-warning {{static data member 'd' in union is incompatible with C++98}} expected-warning {{'constexpr' specifier is incompatible with C++98}}
252     static const int n = 0; // expected-warning {{static data member 'n' in union is incompatible with C++98}}
253     static int k; // expected-warning {{static data member 'k' in union is incompatible with C++98}}
254   };
255 }
256 
257 int EnumNNS = Enum::enum_val; // expected-warning {{enumeration type in nested name specifier is incompatible with C++98}}
258 template<typename T> void EnumNNSFn() {
259   int k = T::enum_val; // expected-warning {{enumeration type in nested name specifier is incompatible with C++98}}
260 };
261 template void EnumNNSFn<Enum>(); // expected-note {{in instantiation}}
262 
263 void JumpDiagnostics(int n) {
264   goto DirectJump; // expected-warning {{jump from this goto statement to its label is incompatible with C++98}}
265   TrivialButNonPOD tnp1; // expected-note {{jump bypasses initialization of non-POD variable}}
266 
267 DirectJump:
268   void *Table[] = {&&DirectJump, &&Later};
269   goto *Table[n]; // expected-warning {{jump from this indirect goto statement to one of its possible targets is incompatible with C++98}}
270 
271   TrivialButNonPOD tnp2; // expected-note {{jump bypasses initialization of non-POD variable}}
272 Later: // expected-note {{possible target of indirect goto statement}}
273   switch (n) {
274     TrivialButNonPOD tnp3; // expected-note {{jump bypasses initialization of non-POD variable}}
275   default: // expected-warning {{jump from switch statement to this case label is incompatible with C++98}}
276     return;
277   }
278 }
279 
280 namespace UnevaluatedMemberAccess {
281   struct S {
282     int n;
283     int f() { return sizeof(S::n); } // ok
284   };
285   int k = sizeof(S::n); // expected-warning {{use of non-static data member 'n' in an unevaluated context is incompatible with C++98}}
286   const std::type_info &ti = typeid(S::n); // expected-warning {{use of non-static data member 'n' in an unevaluated context is incompatible with C++98}}
287 }
288 
289 namespace LiteralUCNs {
290   char c1 = '\u001e'; // expected-warning {{universal character name referring to a control character is incompatible with C++98}}
291   wchar_t c2 = L'\u0041'; // expected-warning {{specifying character 'A' with a universal character name is incompatible with C++98}}
292   const char *s1 = "foo\u0031"; // expected-warning {{specifying character '1' with a universal character name is incompatible with C++98}}
293   const wchar_t *s2 = L"bar\u0085"; // expected-warning {{universal character name referring to a control character is incompatible with C++98}}
294 }
295 
296 namespace NonTypeTemplateArgs {
297   template<typename T, T v> struct S {};
298   const int k = 5; // expected-note {{here}}
299   static void f() {} // expected-note {{here}}
300   S<const int&, k> s1; // expected-warning {{non-type template argument referring to object 'k' with internal linkage is incompatible with C++98}}
301   S<void(&)(), f> s2; // expected-warning {{non-type template argument referring to function 'f' with internal linkage is incompatible with C++98}}
302 }
303 
304 namespace NullPointerTemplateArg {
305   struct A {};
306   template<int*> struct X {};
307   template<int A::*> struct Y {};
308   X<(int*)0> x; // expected-warning {{use of null pointer as non-type template argument is incompatible with C++98}}
309   Y<(int A::*)0> y; // expected-warning {{use of null pointer as non-type template argument is incompatible with C++98}}
310 }
311 
312 namespace PR13480 {
313   struct basic_iterator {
314     basic_iterator(const basic_iterator &it) {} // expected-note {{because type 'PR13480::basic_iterator' has a user-provided copy constructor}}
315     basic_iterator(basic_iterator &it) {}
316   };
317 
318   union test {
319     basic_iterator it; // expected-warning {{union member 'it' with a non-trivial copy constructor is incompatible with C++98}}
320   };
321 }
322 
323 namespace AssignOpUnion {
324   struct a {
325     void operator=(const a &it) {} // expected-note {{because type 'AssignOpUnion::a' has a user-provided copy assignment operator}}
326     void operator=(a &it) {}
327   };
328 
329   struct b {
330     void operator=(const b &it) {} // expected-note {{because type 'AssignOpUnion::b' has a user-provided copy assignment operator}}
331   };
332 
333   union test1 {
334     a x; // expected-warning {{union member 'x' with a non-trivial copy assignment operator is incompatible with C++98}}
335     b y; // expected-warning {{union member 'y' with a non-trivial copy assignment operator is incompatible with C++98}}
336   };
337 }
338 
339 namespace rdar11736429 {
340   struct X { // expected-note {{because type 'rdar11736429::X' has no default constructor}}
341     X(const X&) = delete; // expected-warning{{deleted function definitions are incompatible with C++98}} \
342     // expected-note {{implicit default constructor suppressed by user-declared constructor}}
343   };
344 
345   union S {
346     X x; // expected-warning{{union member 'x' with a non-trivial constructor is incompatible with C++98}}
347   };
348 }
349 
350 template<typename T> T var = T(10);
351 #ifdef CXX14COMPAT
352 // expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
353 #else
354 // expected-warning@-4 {{variable templates are a C++14 extension}}
355 #endif
356 
357 // No diagnostic for specializations of variable templates; we will have
358 // diagnosed the primary template.
359 template<typename T> T* var<T*> = new T();
360 template<> int var<int> = 10;
361 template int var<int>;
362 float fvar = var<float>;
363 
364 class A {
365   template<typename T> static T var = T(10);
366 #ifdef CXX14COMPAT
367 // expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
368 #else
369 // expected-warning@-4 {{variable templates are a C++14 extension}}
370 #endif
371 
372   template<typename T> static T* var<T*> = new T();
373 };
374 
375 struct B {  template<typename T> static T v; };
376 #ifdef CXX14COMPAT
377 // expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
378 #else
379 // expected-warning@-4 {{variable templates are a C++14 extension}}
380 #endif
381 
382 template<typename T> T B::v = T();
383 #ifdef CXX14COMPAT
384 // expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
385 #else
386 // expected-warning@-4 {{variable templates are a C++14 extension}}
387 #endif
388 
389 template<typename T> T* B::v<T*> = new T();
390 template<> int B::v<int> = 10;
391 template int B::v<int>;
392 float fsvar = B::v<float>;
393 
394 #ifdef CXX14COMPAT
395 int digit_seps = 123'456; // expected-warning {{digit separators are incompatible with C++ standards before C++14}}
396 #endif
397