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
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}} expected-warning {{scalar}}
78}
79struct DelayedDefaultArgumentParseInitList {
80  void f(int i = {1}) { // expected-warning {{generalized initializer lists are incompatible with C++98}} expected-warning {{scalar}}
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#ifdef CXX14COMPAT
104auto ff() { return 5; } // expected-warning {{'auto' type specifier is incompatible with C++98}}
105#endif
106
107void RangeFor() {
108  int xs[] = {1, 2, 3};
109  for (int &a : xs) { // expected-warning {{range-based for loop is incompatible with C++98}}
110  }
111  for (auto &b : {1, 2, 3}) {
112  // expected-warning@-1 {{range-based for loop is incompatible with C++98}}
113  // expected-warning@-2 {{'auto' type specifier is incompatible with C++98}}
114  // expected-warning@-3 {{initialization of initializer_list object is incompatible with C++98}}
115  // expected-warning@-4 {{reference initialized from initializer list is incompatible with C++98}}
116  }
117  struct Agg { int a, b; } const &agg = { 1, 2 }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}}
118}
119
120struct InClassInit {
121  int n = 0; // expected-warning {{in-class initialization of non-static data members is incompatible with C++98}}
122};
123
124struct OverrideControlBase {
125  virtual void f();
126  virtual void g();
127};
128struct OverrideControl final : OverrideControlBase { // expected-warning {{'final' keyword is incompatible with C++98}}
129  virtual void f() override; // expected-warning {{'override' keyword is incompatible with C++98}}
130  virtual void g() final; // expected-warning {{'final' keyword is incompatible with C++98}}
131};
132
133using AliasDecl = int; // expected-warning {{alias declarations are incompatible with C++98}}
134template<typename T> using AliasTemplate = T; // expected-warning {{alias declarations are incompatible with C++98}}
135
136inline namespace InlineNS { // expected-warning {{inline namespaces are incompatible with C++98}}
137}
138
139auto auto_deduction = 0; // expected-warning {{'auto' type specifier is incompatible with C++98}}
140int *p = new auto(0); // expected-warning {{'auto' type specifier is incompatible with C++98}}
141
142const int align_of = alignof(int); // expected-warning {{alignof expressions are incompatible with C++98}}
143char16_t c16 = 0; // expected-warning {{'char16_t' type specifier is incompatible with C++98}}
144char32_t c32 = 0; // expected-warning {{'char32_t' type specifier is incompatible with C++98}}
145constexpr int const_expr = 0; // expected-warning {{'constexpr' specifier is incompatible with C++98}}
146decltype(const_expr) decl_type = 0; // expected-warning {{'decltype' type specifier is incompatible with C++98}}
147__decltype(const_expr) decl_type2 = 0; // ok
148void no_except() noexcept; // expected-warning {{noexcept specifications are incompatible with C++98}}
149bool no_except_expr = noexcept(1 + 1); // expected-warning {{noexcept expressions are incompatible with C++98}}
150void *null = nullptr; // expected-warning {{'nullptr' is incompatible with C++98}}
151static_assert(true, "!"); // expected-warning {{static_assert declarations are incompatible with C++98}}
152
153struct InhCtorBase {
154  InhCtorBase(int);
155};
156struct InhCtorDerived : InhCtorBase {
157  using InhCtorBase::InhCtorBase; // expected-warning {{inheriting constructors are incompatible with C++98}}
158};
159
160struct FriendMember {
161  static void MemberFn();
162  friend void FriendMember::MemberFn(); // expected-warning {{friend declaration naming a member of the declaring class is incompatible with C++98}}
163};
164
165struct DelegCtor {
166  DelegCtor(int) : DelegCtor() {} // expected-warning {{delegating constructors are incompatible with C++98}}
167  DelegCtor();
168};
169
170template<int n = 0> void DefaultFuncTemplateArg(); // expected-warning {{default template arguments for a function template are incompatible with C++98}}
171
172template<typename T> int TemplateFn(T) { return 0; }
173void LocalTemplateArg() {
174  struct S {};
175  TemplateFn(S()); // expected-warning {{local type 'S' as template argument is incompatible with C++98}}
176}
177struct {} obj_of_unnamed_type; // expected-note {{here}}
178int UnnamedTemplateArg = TemplateFn(obj_of_unnamed_type); // expected-warning {{unnamed type as template argument is incompatible with C++98}}
179
180namespace RedundantParensInAddressTemplateParam {
181  int n;
182  template<int*p> struct S {};
183  S<(&n)> s; // expected-warning {{redundant parentheses surrounding address non-type template argument are incompatible with C++98}}
184  S<(((&n)))> t; // expected-warning {{redundant parentheses surrounding address non-type template argument are incompatible with C++98}}
185}
186
187namespace TemplateSpecOutOfScopeNs {
188  template<typename T> struct S {}; // expected-note {{here}}
189}
190template<> struct TemplateSpecOutOfScopeNs::S<char> {}; // expected-warning {{class template specialization of 'S' outside namespace 'TemplateSpecOutOfScopeNs' is incompatible with C++98}}
191
192struct Typename {
193  template<typename T> struct Inner {};
194};
195typename ::Typename TypenameOutsideTemplate(); // expected-warning {{use of 'typename' outside of a template is incompatible with C++98}}
196Typename::template Inner<int> TemplateOutsideTemplate(); // expected-warning {{use of 'template' keyword outside of a template is incompatible with C++98}}
197
198struct TrivialButNonPOD {
199  int f(int);
200private:
201  int k;
202};
203void Ellipsis(int n, ...);
204void TrivialButNonPODThroughEllipsis() {
205  Ellipsis(1, TrivialButNonPOD()); // expected-warning {{passing object of trivial but non-POD type 'TrivialButNonPOD' through variadic function is incompatible with C++98}}
206}
207
208struct HasExplicitConversion {
209  explicit operator bool(); // expected-warning {{explicit conversion functions are incompatible with C++98}}
210};
211
212struct Struct {};
213enum Enum { enum_val = 0 };
214struct BadFriends {
215  friend enum ::Enum; // expected-warning {{befriending enumeration type 'enum ::Enum' is incompatible with C++98}}
216  friend int; // expected-warning {{non-class friend type 'int' is incompatible with C++98}}
217  friend Struct; // expected-warning {{befriending 'Struct' without 'struct' keyword is incompatible with C++98}}
218};
219
220int n = {}; // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
221
222class PrivateMember {
223  struct ImPrivate {};
224};
225template<typename T> typename T::ImPrivate SFINAEAccessControl(T t) { // expected-warning {{substitution failure due to access control is incompatible with C++98}}
226  return typename T::ImPrivate();
227}
228int SFINAEAccessControl(...) { return 0; }
229int CheckSFINAEAccessControl = SFINAEAccessControl(PrivateMember()); // expected-note {{while substituting deduced template arguments into function template 'SFINAEAccessControl' [with T = PrivateMember]}}
230
231namespace UnionOrAnonStructMembers {
232  struct NonTrivCtor {
233    NonTrivCtor(); // expected-note 2{{user-provided default constructor}}
234  };
235  struct NonTrivCopy {
236    NonTrivCopy(const NonTrivCopy&); // expected-note 2{{user-provided copy constructor}}
237  };
238  struct NonTrivDtor {
239    ~NonTrivDtor(); // expected-note 2{{user-provided destructor}}
240  };
241  union BadUnion {
242    NonTrivCtor ntc; // expected-warning {{union member 'ntc' with a non-trivial constructor is incompatible with C++98}}
243    NonTrivCopy ntcp; // expected-warning {{union member 'ntcp' with a non-trivial copy constructor is incompatible with C++98}}
244    NonTrivDtor ntd; // expected-warning {{union member 'ntd' with a non-trivial destructor is incompatible with C++98}}
245  };
246  struct Wrap {
247    struct {
248      NonTrivCtor ntc; // expected-warning {{anonymous struct member 'ntc' with a non-trivial constructor is incompatible with C++98}}
249      NonTrivCopy ntcp; // expected-warning {{anonymous struct member 'ntcp' with a non-trivial copy constructor is incompatible with C++98}}
250      NonTrivDtor ntd; // expected-warning {{anonymous struct member 'ntd' with a non-trivial destructor is incompatible with C++98}}
251    };
252  };
253  union WithStaticDataMember {
254    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}}
255    static const int n = 0; // expected-warning {{static data member 'n' in union is incompatible with C++98}}
256    static int k; // expected-warning {{static data member 'k' in union is incompatible with C++98}}
257  };
258}
259
260int EnumNNS = Enum::enum_val; // expected-warning {{enumeration type in nested name specifier is incompatible with C++98}}
261template<typename T> void EnumNNSFn() {
262  int k = T::enum_val; // expected-warning {{enumeration type in nested name specifier is incompatible with C++98}}
263};
264template void EnumNNSFn<Enum>(); // expected-note {{in instantiation}}
265
266void JumpDiagnostics(int n) {
267  goto DirectJump; // expected-warning {{jump from this goto statement to its label is incompatible with C++98}}
268  TrivialButNonPOD tnp1; // expected-note {{jump bypasses initialization of non-POD variable}}
269
270DirectJump:
271  void *Table[] = {&&DirectJump, &&Later};
272  goto *Table[n]; // expected-warning {{jump from this indirect goto statement to one of its possible targets is incompatible with C++98}}
273
274  TrivialButNonPOD tnp2; // expected-note {{jump bypasses initialization of non-POD variable}}
275Later: // expected-note {{possible target of indirect goto statement}}
276  switch (n) {
277    TrivialButNonPOD tnp3; // expected-note {{jump bypasses initialization of non-POD variable}}
278  default: // expected-warning {{jump from switch statement to this case label is incompatible with C++98}}
279    return;
280  }
281}
282
283namespace UnevaluatedMemberAccess {
284  struct S {
285    int n;
286    int f() { return sizeof(S::n); } // ok
287  };
288  int k = sizeof(S::n); // expected-warning {{use of non-static data member 'n' in an unevaluated context is incompatible with C++98}}
289  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}}
290}
291
292namespace LiteralUCNs {
293  char c1 = '\u001e'; // expected-warning {{universal character name referring to a control character is incompatible with C++98}}
294  wchar_t c2 = L'\u0041'; // expected-warning {{specifying character 'A' with a universal character name is incompatible with C++98}}
295  const char *s1 = "foo\u0031"; // expected-warning {{specifying character '1' with a universal character name is incompatible with C++98}}
296  const wchar_t *s2 = L"bar\u0085"; // expected-warning {{universal character name referring to a control character is incompatible with C++98}}
297}
298
299namespace NonTypeTemplateArgs {
300  template<typename T, T v> struct S {};
301  const int k = 5; // expected-note {{here}}
302  static void f() {} // expected-note {{here}}
303  S<const int&, k> s1; // expected-warning {{non-type template argument referring to object 'k' with internal linkage is incompatible with C++98}}
304  S<void(&)(), f> s2; // expected-warning {{non-type template argument referring to function 'f' with internal linkage is incompatible with C++98}}
305}
306
307namespace NullPointerTemplateArg {
308  struct A {};
309  template<int*> struct X {};
310  template<int A::*> struct Y {};
311  X<(int*)0> x; // expected-warning {{use of null pointer as non-type template argument is incompatible with C++98}}
312  Y<(int A::*)0> y; // expected-warning {{use of null pointer as non-type template argument is incompatible with C++98}}
313}
314
315namespace PR13480 {
316  struct basic_iterator {
317    basic_iterator(const basic_iterator &it) {} // expected-note {{because type 'PR13480::basic_iterator' has a user-provided copy constructor}}
318    basic_iterator(basic_iterator &it) {}
319  };
320
321  union test {
322    basic_iterator it; // expected-warning {{union member 'it' with a non-trivial copy constructor is incompatible with C++98}}
323  };
324}
325
326namespace AssignOpUnion {
327  struct a {
328    void operator=(const a &it) {} // expected-note {{because type 'AssignOpUnion::a' has a user-provided copy assignment operator}}
329    void operator=(a &it) {}
330  };
331
332  struct b {
333    void operator=(const b &it) {} // expected-note {{because type 'AssignOpUnion::b' has a user-provided copy assignment operator}}
334  };
335
336  union test1 {
337    a x; // expected-warning {{union member 'x' with a non-trivial copy assignment operator is incompatible with C++98}}
338    b y; // expected-warning {{union member 'y' with a non-trivial copy assignment operator is incompatible with C++98}}
339  };
340}
341
342namespace rdar11736429 {
343  struct X { // expected-note {{because type 'rdar11736429::X' has no default constructor}}
344    X(const X&) = delete; // expected-warning{{deleted function definitions are incompatible with C++98}} \
345    // expected-note {{implicit default constructor suppressed by user-declared constructor}}
346  };
347
348  union S {
349    X x; // expected-warning{{union member 'x' with a non-trivial constructor is incompatible with C++98}}
350  };
351}
352
353template<typename T> T var = T(10);
354#ifdef CXX14COMPAT
355// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
356#else
357// expected-warning@-4 {{variable templates are a C++14 extension}}
358#endif
359
360// No diagnostic for specializations of variable templates; we will have
361// diagnosed the primary template.
362template<typename T> T* var<T*> = new T();
363template<> int var<int> = 10;
364template int var<int>;
365float fvar = var<float>;
366
367class A {
368  template<typename T> static T var = T(10);
369#ifdef CXX14COMPAT
370// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
371#else
372// expected-warning@-4 {{variable templates are a C++14 extension}}
373#endif
374
375  template<typename T> static T* var<T*> = new T();
376};
377
378struct B {  template<typename T> static T v; };
379#ifdef CXX14COMPAT
380// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
381#else
382// expected-warning@-4 {{variable templates are a C++14 extension}}
383#endif
384
385template<typename T> T B::v = T();
386#ifdef CXX14COMPAT
387// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
388#else
389// expected-warning@-4 {{variable templates are a C++14 extension}}
390#endif
391
392template<typename T> T* B::v<T*> = new T();
393template<> int B::v<int> = 10;
394template int B::v<int>;
395float fsvar = B::v<float>;
396
397#ifdef CXX14COMPAT
398int digit_seps = 123'456; // expected-warning {{digit separators are incompatible with C++ standards before C++14}}
399#endif
400