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 // RUN: %clang_cc1 -fsyntax-only -std=c++17 -Wc++98-compat -verify %s -DCXX14COMPAT -DCXX17COMPAT 4 5 namespace std { 6 struct type_info; 7 using size_t = decltype(sizeof(0)); // expected-warning {{decltype}} expected-warning {{alias}} 8 template<typename T> struct initializer_list { 9 initializer_list(const T*, size_t); 10 const T *p; 11 size_t n; 12 const T *begin(); 13 const T *end(); 14 }; 15 } 16 17 template<typename ...T> // expected-warning {{variadic templates are incompatible with C++98}} 18 class Variadic1 {}; 19 20 template<template<typename> class ...T> // expected-warning {{variadic templates are incompatible with C++98}} 21 class Variadic2 {}; 22 23 template<int ...I> // expected-warning {{variadic templates are incompatible with C++98}} 24 class Variadic3 {}; 25 26 alignas(8) int with_alignas; // expected-warning {{'alignas' is incompatible with C++98}} 27 int with_attribute [[ ]]; // expected-warning {{[[]] attributes are incompatible with C++ standards before C++11}} 28 29 void Literals() { 30 (void)u8"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"str"; // expected-warning {{unicode literals are incompatible with C++98}} 33 (void)u'x'; // expected-warning {{unicode literals are incompatible with C++98}} 34 (void)U'x'; // expected-warning {{unicode literals are incompatible with C++98}} 35 36 (void)u8R"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)UR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}} 39 (void)R"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}} 40 (void)LR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}} 41 } 42 43 template<typename T> struct S {}; 44 namespace TemplateParsing { 45 S<::S<void> > s; // expected-warning {{'<::' is treated as digraph '<:' (aka '[') followed by ':' in C++98}} 46 S< ::S<void>> t; // expected-warning {{consecutive right angle brackets are incompatible with C++98 (use '> >')}} 47 } 48 49 void Lambda() { 50 []{}(); // expected-warning {{lambda expressions are incompatible with C++98}} 51 // Don't warn about implicit "-> auto" here. 52 [](){}(); // expected-warning {{lambda expressions are incompatible with C++98}} 53 } 54 55 struct Ctor { 56 Ctor(int, char); 57 Ctor(double, long); 58 }; 59 struct InitListCtor { 60 InitListCtor(std::initializer_list<bool>); 61 }; 62 63 int InitList(int i = {}) { // expected-warning {{generalized initializer lists are incompatible with C++98}} \ 64 // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}} 65 (void)new int {}; // expected-warning {{generalized initializer lists are incompatible with C++98}} \ 66 // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}} 67 (void)int{}; // expected-warning {{generalized initializer lists are incompatible with C++98}} \ 68 // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}} 69 int x { 0 }; // expected-warning {{generalized initializer lists are incompatible with C++98}} 70 S<int> s = {}; // ok, aggregate 71 s = {}; // expected-warning {{generalized initializer lists are incompatible with C++98}} 72 std::initializer_list<int> xs = { 1, 2, 3 }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}} 73 auto ys = { 1, 2, 3 }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}} \ 74 // expected-warning {{'auto' type specifier is incompatible with C++98}} 75 Ctor c1 = { 1, 2 }; // expected-warning {{constructor call from initializer list is incompatible with C++98}} 76 Ctor c2 = { 3.0, 4l }; // expected-warning {{constructor call from initializer list is incompatible with C++98}} 77 InitListCtor ilc = { true, false }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}} 78 const int &r = { 0 }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}} 79 struct { int a; const int &r; } rr = { 0, {0} }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}} 80 return { 0 }; // expected-warning {{generalized initializer lists are incompatible with C++98}} expected-warning {{scalar}} 81 } 82 struct DelayedDefaultArgumentParseInitList { 83 void f(int i = {1}) { // expected-warning {{generalized initializer lists are incompatible with C++98}} expected-warning {{scalar}} 84 } 85 }; 86 87 int operator""_hello(const char *); // expected-warning {{literal operators are incompatible with C++98}} 88 89 enum EnumFixed : int { // expected-warning {{enumeration types with a fixed underlying type are incompatible with C++98}} 90 }; 91 92 enum class EnumScoped { // expected-warning {{scoped enumerations are incompatible with C++98}} 93 }; 94 95 void Deleted() = delete; // expected-warning {{deleted function definitions are incompatible with C++98}} 96 struct Defaulted { 97 Defaulted() = default; // expected-warning {{defaulted function definitions are incompatible with C++98}} 98 }; 99 100 int &&RvalueReference = 0; // expected-warning {{rvalue references are incompatible with C++98}} 101 struct RefQualifier { 102 void f() &; // expected-warning {{reference qualifiers on functions are incompatible with C++98}} 103 }; 104 105 auto f() -> int; // expected-warning {{trailing return types are incompatible with C++98}} 106 #ifdef CXX14COMPAT 107 auto ff() { return 5; } // expected-warning {{'auto' type specifier is incompatible with C++98}} 108 // expected-warning@-1 {{return type deduction is incompatible with C++ standards before C++14}} 109 #endif 110 111 void RangeFor() { 112 int xs[] = {1, 2, 3}; 113 for (int &a : xs) { // expected-warning {{range-based for loop is incompatible with C++98}} 114 } 115 for (auto &b : {1, 2, 3}) { 116 // expected-warning@-1 {{range-based for loop is incompatible with C++98}} 117 // expected-warning@-2 {{'auto' type specifier is incompatible with C++98}} 118 // expected-warning@-3 {{initialization of initializer_list object is incompatible with C++98}} 119 // expected-warning@-4 {{reference initialized from initializer list is incompatible with C++98}} 120 } 121 struct Agg { int a, b; } const &agg = { 1, 2 }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}} 122 } 123 124 struct InClassInit { 125 int n = 0; // expected-warning {{default member initializer for non-static data members is incompatible with C++98}} 126 }; 127 128 struct OverrideControlBase { 129 virtual void f(); 130 virtual void g(); 131 }; 132 struct OverrideControl final : OverrideControlBase { // expected-warning {{'final' keyword is incompatible with C++98}} 133 virtual void f() override; // expected-warning {{'override' keyword is incompatible with C++98}} 134 virtual void g() final; // expected-warning {{'final' keyword is incompatible with C++98}} 135 }; 136 137 using AliasDecl = int; // expected-warning {{alias declarations are incompatible with C++98}} 138 template<typename T> using AliasTemplate = T; // expected-warning {{alias declarations are incompatible with C++98}} 139 140 inline namespace InlineNS { // expected-warning {{inline namespaces are incompatible with C++98}} 141 } 142 143 auto auto_deduction = 0; // expected-warning {{'auto' type specifier is incompatible with C++98}} 144 int *p = new auto(0); // expected-warning {{'auto' type specifier is incompatible with C++98}} 145 146 const int align_of = alignof(int); // expected-warning {{alignof expressions are incompatible with C++98}} 147 char16_t c16 = 0; // expected-warning {{'char16_t' type specifier is incompatible with C++98}} 148 char32_t c32 = 0; // expected-warning {{'char32_t' type specifier is incompatible with C++98}} 149 constexpr int const_expr = 0; // expected-warning {{'constexpr' specifier is incompatible with C++98}} 150 decltype(const_expr) decl_type = 0; // expected-warning {{'decltype' type specifier is incompatible with C++98}} 151 __decltype(const_expr) decl_type2 = 0; // ok 152 void no_except() noexcept; // expected-warning {{noexcept specifications are incompatible with C++98}} 153 bool no_except_expr = noexcept(1 + 1); // expected-warning {{noexcept expressions are incompatible with C++98}} 154 void *null = nullptr; // expected-warning {{'nullptr' is incompatible with C++98}} 155 static_assert(true, "!"); // expected-warning {{'static_assert' declarations are incompatible with C++98}} 156 157 struct InhCtorBase { 158 InhCtorBase(int); 159 }; 160 struct InhCtorDerived : InhCtorBase { 161 using InhCtorBase::InhCtorBase; // expected-warning {{inheriting constructors are incompatible with C++98}} 162 }; 163 164 struct FriendMember { 165 static void MemberFn(); 166 friend void FriendMember::MemberFn(); // expected-warning {{friend declaration naming a member of the declaring class is incompatible with C++98}} 167 }; 168 169 struct DelegCtor { 170 DelegCtor(int) : DelegCtor() {} // expected-warning {{delegating constructors are incompatible with C++98}} 171 DelegCtor(); 172 }; 173 174 template<int n = 0> void DefaultFuncTemplateArg(); // expected-warning {{default template arguments for a function template are incompatible with C++98}} 175 176 template<typename T> int TemplateFn(T) { return 0; } 177 void LocalTemplateArg() { 178 struct S {}; 179 TemplateFn(S()); // expected-warning {{local type 'S' as template argument is incompatible with C++98}} 180 } 181 struct {} obj_of_unnamed_type; // expected-note {{here}} 182 int UnnamedTemplateArg = TemplateFn(obj_of_unnamed_type); // expected-warning {{unnamed type as template argument is incompatible with C++98}} 183 184 // FIXME: We do not implement C++98 compatibility warnings for the C++17 185 // template argument evaluation rules. 186 #ifndef CXX17COMPAT 187 namespace RedundantParensInAddressTemplateParam { 188 int n; 189 template<int*p> struct S {}; 190 S<(&n)> s; // expected-warning {{redundant parentheses surrounding address non-type template argument are incompatible with C++98}} 191 S<(((&n)))> t; // expected-warning {{redundant parentheses surrounding address non-type template argument are incompatible with C++98}} 192 } 193 #endif 194 195 namespace TemplateSpecOutOfScopeNs { 196 template<typename T> struct S {}; 197 } 198 template<> struct TemplateSpecOutOfScopeNs::S<char> {}; 199 200 struct Typename { 201 template<typename T> struct Inner {}; 202 }; 203 typename ::Typename TypenameOutsideTemplate(); // expected-warning {{use of 'typename' outside of a template is incompatible with C++98}} 204 Typename::template Inner<int> TemplateOutsideTemplate(); // expected-warning {{use of 'template' keyword outside of a template is incompatible with C++98}} 205 206 struct TrivialButNonPOD { 207 int f(int); 208 private: 209 int k; 210 }; 211 void Ellipsis(int n, ...); 212 void TrivialButNonPODThroughEllipsis() { 213 Ellipsis(1, TrivialButNonPOD()); // expected-warning {{passing object of trivial but non-POD type 'TrivialButNonPOD' through variadic function is incompatible with C++98}} 214 } 215 216 struct HasExplicitConversion { 217 explicit operator bool(); // expected-warning {{explicit conversion functions are incompatible with C++98}} 218 }; 219 220 struct Struct {}; 221 enum Enum { enum_val = 0 }; 222 struct BadFriends { 223 friend enum ::Enum; // expected-warning {{elaborated enum specifier cannot be declared as a friend}} 224 // expected-note@-1 {{remove 'enum' to befriend an enum}} 225 friend int; // expected-warning {{non-class friend type 'int' is incompatible with C++98}} 226 friend Struct; // expected-warning {{befriending 'Struct' without 'struct' keyword is incompatible with C++98}} 227 }; 228 229 int n = {}; // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}} 230 231 class PrivateMember { 232 struct ImPrivate {}; 233 }; 234 template<typename T> typename T::ImPrivate SFINAEAccessControl(T t) { // expected-warning {{substitution failure due to access control is incompatible with C++98}} 235 return typename T::ImPrivate(); 236 } 237 int SFINAEAccessControl(...) { return 0; } 238 int CheckSFINAEAccessControl = SFINAEAccessControl(PrivateMember()); // expected-note {{while substituting deduced template arguments into function template 'SFINAEAccessControl' [with T = PrivateMember]}} 239 240 namespace UnionOrAnonStructMembers { 241 struct NonTrivCtor { 242 NonTrivCtor(); // expected-note 2{{user-provided default constructor}} 243 }; 244 struct NonTrivCopy { 245 NonTrivCopy(const NonTrivCopy&); // expected-note 2{{user-provided copy constructor}} 246 }; 247 struct NonTrivDtor { 248 ~NonTrivDtor(); // expected-note 2{{user-provided destructor}} 249 }; 250 union BadUnion { 251 NonTrivCtor ntc; // expected-warning {{union member 'ntc' with a non-trivial default constructor is incompatible with C++98}} 252 NonTrivCopy ntcp; // expected-warning {{union member 'ntcp' with a non-trivial copy constructor is incompatible with C++98}} 253 NonTrivDtor ntd; // expected-warning {{union member 'ntd' with a non-trivial destructor is incompatible with C++98}} 254 }; 255 struct Wrap { 256 struct { 257 NonTrivCtor ntc; // expected-warning {{anonymous struct member 'ntc' with a non-trivial default constructor is incompatible with C++98}} 258 NonTrivCopy ntcp; // expected-warning {{anonymous struct member 'ntcp' with a non-trivial copy constructor is incompatible with C++98}} 259 NonTrivDtor ntd; // expected-warning {{anonymous struct member 'ntd' with a non-trivial destructor is incompatible with C++98}} 260 }; 261 }; 262 union WithStaticDataMember { 263 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}} 264 static const int n = 0; // expected-warning {{static data member 'n' in union is incompatible with C++98}} 265 static int k; // expected-warning {{static data member 'k' in union is incompatible with C++98}} 266 }; 267 } 268 269 int EnumNNS = Enum::enum_val; // expected-warning {{enumeration type in nested name specifier is incompatible with C++98}} 270 template<typename T> void EnumNNSFn() { 271 int k = T::enum_val; // expected-warning {{enumeration type in nested name specifier is incompatible with C++98}} 272 }; 273 template void EnumNNSFn<Enum>(); // expected-note {{in instantiation}} 274 275 void JumpDiagnostics(int n) { 276 goto DirectJump; // expected-warning {{jump from this goto statement to its label is incompatible with C++98}} 277 TrivialButNonPOD tnp1; // expected-note {{jump bypasses initialization of non-POD variable}} 278 279 DirectJump: 280 void *Table[] = {&&DirectJump, &&Later}; 281 goto *Table[n]; // expected-warning {{jump from this indirect goto statement to one of its possible targets is incompatible with C++98}} 282 283 TrivialButNonPOD tnp2; // expected-note {{jump bypasses initialization of non-POD variable}} 284 Later: // expected-note {{possible target of indirect goto statement}} 285 switch (n) { 286 TrivialButNonPOD tnp3; // expected-note {{jump bypasses initialization of non-POD variable}} 287 default: // expected-warning {{jump from switch statement to this case label is incompatible with C++98}} 288 return; 289 } 290 } 291 292 namespace UnevaluatedMemberAccess { 293 struct S { 294 int n; 295 int f() { return sizeof(S::n); } // ok 296 }; 297 int k = sizeof(S::n); // expected-warning {{use of non-static data member 'n' in an unevaluated context is incompatible with C++98}} 298 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}} 299 } 300 301 namespace LiteralUCNs { 302 char c1 = '\u001e'; // expected-warning {{universal character name referring to a control character is incompatible with C++98}} 303 wchar_t c2 = L'\u0041'; // expected-warning {{specifying character 'A' with a universal character name is incompatible with C++98}} 304 const char *s1 = "foo\u0031"; // expected-warning {{specifying character '1' with a universal character name is incompatible with C++98}} 305 const wchar_t *s2 = L"bar\u0085"; // expected-warning {{universal character name referring to a control character is incompatible with C++98}} 306 } 307 308 // FIXME: We do not implement C++98 compatibility warnings for the C++17 309 // template argument evaluation rules. 310 #ifndef CXX17COMPAT 311 namespace NonTypeTemplateArgs { 312 template<typename T, T v> struct S {}; 313 const int k = 5; // expected-note {{here}} 314 static void f() {} // expected-note {{here}} 315 S<const int&, k> s1; // expected-warning {{non-type template argument referring to object 'k' with internal linkage is incompatible with C++98}} 316 S<void(&)(), f> s2; // expected-warning {{non-type template argument referring to function 'f' with internal linkage is incompatible with C++98}} 317 } 318 319 namespace NullPointerTemplateArg { 320 struct A {}; 321 template<int*> struct X {}; 322 template<int A::*> struct Y {}; 323 X<(int*)0> x; // expected-warning {{use of null pointer as non-type template argument is incompatible with C++98}} 324 Y<(int A::*)0> y; // expected-warning {{use of null pointer as non-type template argument is incompatible with C++98}} 325 } 326 #endif 327 328 namespace PR13480 { 329 struct basic_iterator { 330 basic_iterator(const basic_iterator &it) {} // expected-note {{because type 'PR13480::basic_iterator' has a user-provided copy constructor}} 331 basic_iterator(basic_iterator &it) {} 332 }; 333 334 union test { 335 basic_iterator it; // expected-warning {{union member 'it' with a non-trivial copy constructor is incompatible with C++98}} 336 }; 337 } 338 339 namespace AssignOpUnion { 340 struct a { 341 void operator=(const a &it) {} // expected-note {{because type 'AssignOpUnion::a' has a user-provided copy assignment operator}} 342 void operator=(a &it) {} 343 }; 344 345 struct b { 346 void operator=(const b &it) {} // expected-note {{because type 'AssignOpUnion::b' has a user-provided copy assignment operator}} 347 }; 348 349 union test1 { 350 a x; // expected-warning {{union member 'x' with a non-trivial copy assignment operator is incompatible with C++98}} 351 b y; // expected-warning {{union member 'y' with a non-trivial copy assignment operator is incompatible with C++98}} 352 }; 353 } 354 355 namespace rdar11736429 { 356 struct X { // expected-note {{because type 'rdar11736429::X' has no default constructor}} 357 X(const X&) = delete; // expected-warning{{deleted function definitions are incompatible with C++98}} \ 358 // expected-note {{implicit default constructor suppressed by user-declared constructor}} 359 }; 360 361 union S { 362 X x; // expected-warning{{union member 'x' with a non-trivial default constructor is incompatible with C++98}} 363 }; 364 } 365 366 template<typename T> T var = T(10); 367 #ifdef CXX14COMPAT 368 // expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}} 369 #else 370 // expected-warning@-4 {{variable templates are a C++14 extension}} 371 #endif 372 373 // No diagnostic for specializations of variable templates; we will have 374 // diagnosed the primary template. 375 template<typename T> T* var<T*> = new T(); 376 template<> int var<int> = 10; 377 template char var<char>; 378 float fvar = var<float>; 379 380 class A { 381 template<typename T> static T var = T(10); 382 #ifdef CXX14COMPAT 383 // expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}} 384 #else 385 // expected-warning@-4 {{variable templates are a C++14 extension}} 386 #endif 387 388 template<typename T> static T* var<T*> = new T(); 389 }; 390 391 struct B { template<typename T> static T v; }; 392 #ifdef CXX14COMPAT 393 // expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}} 394 #else 395 // expected-warning@-4 {{variable templates are a C++14 extension}} 396 #endif 397 398 template<typename T> T B::v = T(); 399 #ifdef CXX14COMPAT 400 // expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}} 401 #else 402 // expected-warning@-4 {{variable templates are a C++14 extension}} 403 #endif 404 405 template<typename T> T* B::v<T*> = new T(); 406 template<> int B::v<int> = 10; 407 template char B::v<char>; 408 float fsvar = B::v<float>; 409 410 #ifdef CXX14COMPAT 411 int digit_seps = 123'456; // expected-warning {{digit separators are incompatible with C++ standards before C++14}} 412 #endif 413 414 #ifdef CXX17COMPAT 415 template<class T> struct CTAD {}; 416 void ctad_test() { 417 CTAD<int> s; 418 CTAD t = s; // expected-warning {{class template argument deduction is incompatible with C++ standards before C++17}} 419 } 420 #endif 421