1// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wc++98-compat -verify %s
2// RUN: %clang_cc1 -fsyntax-only -std=c++1y -Wc++98-compat -verify %s -DCXX1YCOMPAT
3
4namespace 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
16template<typename ...T>  // expected-warning {{variadic templates are incompatible with C++98}}
17class Variadic1 {};
18
19template<template<typename> class ...T>  // expected-warning {{variadic templates are incompatible with C++98}}
20class Variadic2 {};
21
22template<int ...I>  // expected-warning {{variadic templates are incompatible with C++98}}
23class Variadic3 {};
24
25alignas(8) int with_alignas; // expected-warning {{'alignas' is incompatible with C++98}}
26int with_attribute [[ ]]; // expected-warning {{C++11 attribute syntax is incompatible with C++98}}
27
28void 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
42template<typename T> struct S {};
43namespace 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
48void Lambda() {
49  []{}(); // expected-warning {{lambda expressions are incompatible with C++98}}
50}
51
52struct Ctor {
53  Ctor(int, char);
54  Ctor(double, long);
55};
56struct InitListCtor {
57  InitListCtor(std::initializer_list<bool>);
58};
59
60int 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}
79struct DelayedDefaultArgumentParseInitList {
80  void f(int i = {1}) { // expected-warning {{generalized initializer lists are incompatible with C++98}}
81  }
82};
83
84int operator"" _hello(const char *); // expected-warning {{literal operators are incompatible with C++98}}
85
86enum EnumFixed : int { // expected-warning {{enumeration types with a fixed underlying type are incompatible with C++98}}
87};
88
89enum class EnumScoped { // expected-warning {{scoped enumerations are incompatible with C++98}}
90};
91
92void Deleted() = delete; // expected-warning {{deleted function definitions are incompatible with C++98}}
93struct Defaulted {
94  Defaulted() = default; // expected-warning {{defaulted function definitions are incompatible with C++98}}
95};
96
97int &&RvalueReference = 0; // expected-warning {{rvalue references are incompatible with C++98}}
98struct RefQualifier {
99  void f() &; // expected-warning {{reference qualifiers on functions are incompatible with C++98}}
100};
101
102auto f() -> int; // expected-warning {{trailing return types are incompatible with C++98}}
103
104void 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
117struct InClassInit {
118  int n = 0; // expected-warning {{in-class initialization of non-static data members is incompatible with C++98}}
119};
120
121struct OverrideControlBase {
122  virtual void f();
123  virtual void g();
124};
125struct 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
130using AliasDecl = int; // expected-warning {{alias declarations are incompatible with C++98}}
131template<typename T> using AliasTemplate = T; // expected-warning {{alias declarations are incompatible with C++98}}
132
133inline namespace InlineNS { // expected-warning {{inline namespaces are incompatible with C++98}}
134}
135
136auto auto_deduction = 0; // expected-warning {{'auto' type specifier is incompatible with C++98}}
137int *p = new auto(0); // expected-warning {{'auto' type specifier is incompatible with C++98}}
138
139const int align_of = alignof(int); // expected-warning {{alignof expressions are incompatible with C++98}}
140char16_t c16 = 0; // expected-warning {{'char16_t' type specifier is incompatible with C++98}}
141char32_t c32 = 0; // expected-warning {{'char32_t' type specifier is incompatible with C++98}}
142constexpr int const_expr = 0; // expected-warning {{'constexpr' specifier is incompatible with C++98}}
143decltype(const_expr) decl_type = 0; // expected-warning {{'decltype' type specifier is incompatible with C++98}}
144__decltype(const_expr) decl_type2 = 0; // ok
145void no_except() noexcept; // expected-warning {{noexcept specifications are incompatible with C++98}}
146bool no_except_expr = noexcept(1 + 1); // expected-warning {{noexcept expressions are incompatible with C++98}}
147void *null = nullptr; // expected-warning {{'nullptr' is incompatible with C++98}}
148static_assert(true, "!"); // expected-warning {{static_assert declarations are incompatible with C++98}}
149
150struct InhCtorBase {
151  InhCtorBase(int);
152};
153struct InhCtorDerived : InhCtorBase {
154  using InhCtorBase::InhCtorBase; // expected-warning {{inheriting constructors are incompatible with C++98}}
155};
156
157struct 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
162struct DelegCtor {
163  DelegCtor(int) : DelegCtor() {} // expected-warning {{delegating constructors are incompatible with C++98}}
164  DelegCtor();
165};
166
167template<int n = 0> void DefaultFuncTemplateArg(); // expected-warning {{default template arguments for a function template are incompatible with C++98}}
168
169template<typename T> int TemplateFn(T) { return 0; }
170void LocalTemplateArg() {
171  struct S {};
172  TemplateFn(S()); // expected-warning {{local type 'S' as template argument is incompatible with C++98}}
173}
174struct {} obj_of_unnamed_type; // expected-note {{here}}
175int UnnamedTemplateArg = TemplateFn(obj_of_unnamed_type); // expected-warning {{unnamed type as template argument is incompatible with C++98}}
176
177namespace 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
184namespace TemplateSpecOutOfScopeNs {
185  template<typename T> struct S {}; // expected-note {{here}}
186}
187template<> struct TemplateSpecOutOfScopeNs::S<char> {}; // expected-warning {{class template specialization of 'S' outside namespace 'TemplateSpecOutOfScopeNs' is incompatible with C++98}}
188
189struct Typename {
190  template<typename T> struct Inner {};
191};
192typename ::Typename TypenameOutsideTemplate(); // expected-warning {{use of 'typename' outside of a template is incompatible with C++98}}
193Typename::template Inner<int> TemplateOutsideTemplate(); // expected-warning {{use of 'template' keyword outside of a template is incompatible with C++98}}
194
195struct TrivialButNonPOD {
196  int f(int);
197private:
198  int k;
199};
200void Ellipsis(int n, ...);
201void 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
205struct HasExplicitConversion {
206  explicit operator bool(); // expected-warning {{explicit conversion functions are incompatible with C++98}}
207};
208
209struct Struct {};
210enum Enum { enum_val = 0 };
211struct 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
217int n = {}; // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
218
219class PrivateMember {
220  struct ImPrivate {};
221};
222template<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}
225int SFINAEAccessControl(...) { return 0; }
226int CheckSFINAEAccessControl = SFINAEAccessControl(PrivateMember()); // expected-note {{while substituting deduced template arguments into function template 'SFINAEAccessControl' [with T = PrivateMember]}}
227
228namespace CopyCtorIssues {
229  struct Private {
230    Private();
231  private:
232    Private(const Private&); // expected-note {{declared private here}}
233  };
234  struct NoViable {
235    NoViable();
236    NoViable(NoViable&); // expected-note {{not viable}}
237  };
238  struct Ambiguous {
239    Ambiguous();
240    Ambiguous(const Ambiguous &, int = 0); // expected-note {{candidate}}
241    Ambiguous(const Ambiguous &, double = 0); // expected-note {{candidate}}
242  };
243  struct Deleted {
244    Private p; // expected-note {{implicitly deleted}}
245  };
246
247  const Private &a = Private(); // expected-warning {{copying variable of type 'CopyCtorIssues::Private' when binding a reference to a temporary would invoke an inaccessible constructor in C++98}}
248  const NoViable &b = NoViable(); // expected-warning {{copying variable of type 'CopyCtorIssues::NoViable' when binding a reference to a temporary would find no viable constructor in C++98}}
249  const Ambiguous &c = Ambiguous(); // expected-warning {{copying variable of type 'CopyCtorIssues::Ambiguous' when binding a reference to a temporary would find ambiguous constructors in C++98}}
250  const Deleted &d = Deleted(); // expected-warning {{copying variable of type 'CopyCtorIssues::Deleted' when binding a reference to a temporary would invoke a deleted constructor in C++98}}
251}
252
253namespace UnionOrAnonStructMembers {
254  struct NonTrivCtor {
255    NonTrivCtor(); // expected-note 2{{user-provided default constructor}}
256  };
257  struct NonTrivCopy {
258    NonTrivCopy(const NonTrivCopy&); // expected-note 2{{user-provided copy constructor}}
259  };
260  struct NonTrivDtor {
261    ~NonTrivDtor(); // expected-note 2{{user-provided destructor}}
262  };
263  union BadUnion {
264    NonTrivCtor ntc; // expected-warning {{union member 'ntc' with a non-trivial constructor is incompatible with C++98}}
265    NonTrivCopy ntcp; // expected-warning {{union member 'ntcp' with a non-trivial copy constructor is incompatible with C++98}}
266    NonTrivDtor ntd; // expected-warning {{union member 'ntd' with a non-trivial destructor is incompatible with C++98}}
267  };
268  struct Wrap {
269    struct {
270      NonTrivCtor ntc; // expected-warning {{anonymous struct member 'ntc' with a non-trivial constructor is incompatible with C++98}}
271      NonTrivCopy ntcp; // expected-warning {{anonymous struct member 'ntcp' with a non-trivial copy constructor is incompatible with C++98}}
272      NonTrivDtor ntd; // expected-warning {{anonymous struct member 'ntd' with a non-trivial destructor is incompatible with C++98}}
273    };
274  };
275  union WithStaticDataMember {
276    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}}
277    static const int n = 0; // expected-warning {{static data member 'n' in union is incompatible with C++98}}
278    static int k; // expected-warning {{static data member 'k' in union is incompatible with C++98}}
279  };
280}
281
282int EnumNNS = Enum::enum_val; // expected-warning {{enumeration type in nested name specifier is incompatible with C++98}}
283template<typename T> void EnumNNSFn() {
284  int k = T::enum_val; // expected-warning {{enumeration type in nested name specifier is incompatible with C++98}}
285};
286template void EnumNNSFn<Enum>(); // expected-note {{in instantiation}}
287
288void JumpDiagnostics(int n) {
289  goto DirectJump; // expected-warning {{goto would jump into protected scope in C++98}}
290  TrivialButNonPOD tnp1; // expected-note {{jump bypasses initialization of non-POD variable}}
291
292DirectJump:
293  void *Table[] = {&&DirectJump, &&Later};
294  goto *Table[n]; // expected-warning {{indirect goto might cross protected scopes in C++98}}
295
296  TrivialButNonPOD tnp2; // expected-note {{jump bypasses initialization of non-POD variable}}
297Later: // expected-note {{possible target of indirect goto}}
298  switch (n) {
299    TrivialButNonPOD tnp3; // expected-note {{jump bypasses initialization of non-POD variable}}
300  default: // expected-warning {{switch case would be in a protected scope in C++98}}
301    return;
302  }
303}
304
305namespace UnevaluatedMemberAccess {
306  struct S {
307    int n;
308    int f() { return sizeof(S::n); } // ok
309  };
310  int k = sizeof(S::n); // expected-warning {{use of non-static data member 'n' in an unevaluated context is incompatible with C++98}}
311  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}}
312}
313
314namespace LiteralUCNs {
315  char c1 = '\u001e'; // expected-warning {{universal character name referring to a control character is incompatible with C++98}}
316  wchar_t c2 = L'\u0041'; // expected-warning {{specifying character 'A' with a universal character name is incompatible with C++98}}
317  const char *s1 = "foo\u0031"; // expected-warning {{specifying character '1' with a universal character name is incompatible with C++98}}
318  const wchar_t *s2 = L"bar\u0085"; // expected-warning {{universal character name referring to a control character is incompatible with C++98}}
319}
320
321namespace NonTypeTemplateArgs {
322  template<typename T, T v> struct S {};
323  const int k = 5; // expected-note {{here}}
324  static void f() {} // expected-note {{here}}
325  S<const int&, k> s1; // expected-warning {{non-type template argument referring to object 'k' with internal linkage is incompatible with C++98}}
326  S<void(&)(), f> s2; // expected-warning {{non-type template argument referring to function 'f' with internal linkage is incompatible with C++98}}
327}
328
329namespace NullPointerTemplateArg {
330  struct A {};
331  template<int*> struct X {};
332  template<int A::*> struct Y {};
333  X<(int*)0> x; // expected-warning {{use of null pointer as non-type template argument is incompatible with C++98}}
334  Y<(int A::*)0> y; // expected-warning {{use of null pointer as non-type template argument is incompatible with C++98}}
335}
336
337namespace PR13480 {
338  struct basic_iterator {
339    basic_iterator(const basic_iterator &it) {} // expected-note {{because type 'PR13480::basic_iterator' has a user-provided copy constructor}}
340    basic_iterator(basic_iterator &it) {}
341  };
342
343  union test {
344    basic_iterator it; // expected-warning {{union member 'it' with a non-trivial copy constructor is incompatible with C++98}}
345  };
346}
347
348namespace AssignOpUnion {
349  struct a {
350    void operator=(const a &it) {} // expected-note {{because type 'AssignOpUnion::a' has a user-provided copy assignment operator}}
351    void operator=(a &it) {}
352  };
353
354  struct b {
355    void operator=(const b &it) {} // expected-note {{because type 'AssignOpUnion::b' has a user-provided copy assignment operator}}
356  };
357
358  union test1 {
359    a x; // expected-warning {{union member 'x' with a non-trivial copy assignment operator is incompatible with C++98}}
360    b y; // expected-warning {{union member 'y' with a non-trivial copy assignment operator is incompatible with C++98}}
361  };
362}
363
364namespace rdar11736429 {
365  struct X { // expected-note {{because type 'rdar11736429::X' has no default constructor}}
366    X(const X&) = delete; // expected-warning{{deleted function definitions are incompatible with C++98}} \
367    // expected-note {{implicit default constructor suppressed by user-declared constructor}}
368  };
369
370  union S {
371    X x; // expected-warning{{union member 'x' with a non-trivial constructor is incompatible with C++98}}
372  };
373}
374
375template<typename T> T var = T(10);
376#ifdef CXX1YCOMPAT
377// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++1y}}
378#else
379// expected-warning@-4 {{variable templates are a C++1y extension}}
380#endif
381
382// No diagnostic for specializations of variable templates; we will have
383// diagnosed the primary template.
384template<typename T> T* var<T*> = new T();
385template<> int var<int> = 10;
386template int var<int>;
387float fvar = var<float>;
388
389class A {
390  template<typename T> static T var = T(10);
391#ifdef CXX1YCOMPAT
392// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++1y}}
393#else
394// expected-warning@-4 {{variable templates are a C++1y extension}}
395#endif
396
397  template<typename T> static T* var<T*> = new T();
398};
399
400struct B {  template<typename T> static T v; };
401#ifdef CXX1YCOMPAT
402// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++1y}}
403#else
404// expected-warning@-4 {{variable templates are a C++1y extension}}
405#endif
406
407template<typename T> T B::v = T();
408#ifdef CXX1YCOMPAT
409// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++1y}}
410#else
411// expected-warning@-4 {{variable templates are a C++1y extension}}
412#endif
413
414template<typename T> T* B::v<T*> = new T();
415template<> int B::v<int> = 10;
416template int B::v<int>;
417float fsvar = B::v<float>;
418
419#ifdef CXX1YCOMPAT
420int digit_seps = 123'456; // expected-warning {{digit separators are incompatible with C++ standards before C++1y}}
421#endif
422