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llvm-for-llvmta/tools/clang/test/SemaCXX/cxx98-compat.cpp

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// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wc++98-compat -verify %s
// RUN: %clang_cc1 -fsyntax-only -std=c++14 -Wc++98-compat -verify %s -DCXX14COMPAT
// RUN: %clang_cc1 -fsyntax-only -std=c++17 -Wc++98-compat -verify %s -DCXX14COMPAT -DCXX17COMPAT
namespace std {
struct type_info;
using size_t = decltype(sizeof(0)); // expected-warning {{decltype}} expected-warning {{alias}}
template<typename T> struct initializer_list {
initializer_list(T*, size_t);
T *p;
size_t n;
T *begin();
T *end();
};
}
template<typename ...T> // expected-warning {{variadic templates are incompatible with C++98}}
class Variadic1 {};
template<template<typename> class ...T> // expected-warning {{variadic templates are incompatible with C++98}}
class Variadic2 {};
template<int ...I> // expected-warning {{variadic templates are incompatible with C++98}}
class Variadic3 {};
alignas(8) int with_alignas; // expected-warning {{'alignas' is incompatible with C++98}}
int with_attribute [[ ]]; // expected-warning {{C++11 attribute syntax is incompatible with C++98}}
void Literals() {
(void)u8"str"; // expected-warning {{unicode literals are incompatible with C++98}}
(void)u"str"; // expected-warning {{unicode literals are incompatible with C++98}}
(void)U"str"; // expected-warning {{unicode literals are incompatible with C++98}}
(void)u'x'; // expected-warning {{unicode literals are incompatible with C++98}}
(void)U'x'; // expected-warning {{unicode literals are incompatible with C++98}}
(void)u8R"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
(void)uR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
(void)UR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
(void)R"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
(void)LR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
}
template<typename T> struct S {};
namespace TemplateParsing {
S<::S<void> > s; // expected-warning {{'<::' is treated as digraph '<:' (aka '[') followed by ':' in C++98}}
S< ::S<void>> t; // expected-warning {{consecutive right angle brackets are incompatible with C++98 (use '> >')}}
}
void Lambda() {
[]{}(); // expected-warning {{lambda expressions are incompatible with C++98}}
// Don't warn about implicit "-> auto" here.
[](){}(); // expected-warning {{lambda expressions are incompatible with C++98}}
}
struct Ctor {
Ctor(int, char);
Ctor(double, long);
};
struct InitListCtor {
InitListCtor(std::initializer_list<bool>);
};
int InitList(int i = {}) { // expected-warning {{generalized initializer lists are incompatible with C++98}} \
// expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
(void)new int {}; // expected-warning {{generalized initializer lists are incompatible with C++98}} \
// expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
(void)int{}; // expected-warning {{generalized initializer lists are incompatible with C++98}} \
// expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
int x { 0 }; // expected-warning {{generalized initializer lists are incompatible with C++98}}
S<int> s = {}; // ok, aggregate
s = {}; // expected-warning {{generalized initializer lists are incompatible with C++98}}
std::initializer_list<int> xs = { 1, 2, 3 }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}}
auto ys = { 1, 2, 3 }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}} \
// expected-warning {{'auto' type specifier is incompatible with C++98}}
Ctor c1 = { 1, 2 }; // expected-warning {{constructor call from initializer list is incompatible with C++98}}
Ctor c2 = { 3.0, 4l }; // expected-warning {{constructor call from initializer list is incompatible with C++98}}
InitListCtor ilc = { true, false }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}}
const int &r = { 0 }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}}
struct { int a; const int &r; } rr = { 0, {0} }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}}
return { 0 }; // expected-warning {{generalized initializer lists are incompatible with C++98}} expected-warning {{scalar}}
}
struct DelayedDefaultArgumentParseInitList {
void f(int i = {1}) { // expected-warning {{generalized initializer lists are incompatible with C++98}} expected-warning {{scalar}}
}
};
int operator"" _hello(const char *); // expected-warning {{literal operators are incompatible with C++98}}
enum EnumFixed : int { // expected-warning {{enumeration types with a fixed underlying type are incompatible with C++98}}
};
enum class EnumScoped { // expected-warning {{scoped enumerations are incompatible with C++98}}
};
void Deleted() = delete; // expected-warning {{deleted function definitions are incompatible with C++98}}
struct Defaulted {
Defaulted() = default; // expected-warning {{defaulted function definitions are incompatible with C++98}}
};
int &&RvalueReference = 0; // expected-warning {{rvalue references are incompatible with C++98}}
struct RefQualifier {
void f() &; // expected-warning {{reference qualifiers on functions are incompatible with C++98}}
};
auto f() -> int; // expected-warning {{trailing return types are incompatible with C++98}}
#ifdef CXX14COMPAT
auto ff() { return 5; } // expected-warning {{'auto' type specifier is incompatible with C++98}}
// expected-warning@-1 {{return type deduction is incompatible with C++ standards before C++14}}
#endif
void RangeFor() {
int xs[] = {1, 2, 3};
for (int &a : xs) { // expected-warning {{range-based for loop is incompatible with C++98}}
}
for (auto &b : {1, 2, 3}) {
// expected-warning@-1 {{range-based for loop is incompatible with C++98}}
// expected-warning@-2 {{'auto' type specifier is incompatible with C++98}}
// expected-warning@-3 {{initialization of initializer_list object is incompatible with C++98}}
// expected-warning@-4 {{reference initialized from initializer list is incompatible with C++98}}
}
struct Agg { int a, b; } const &agg = { 1, 2 }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}}
}
struct InClassInit {
int n = 0; // expected-warning {{default member initializer for non-static data members is incompatible with C++98}}
};
struct OverrideControlBase {
virtual void f();
virtual void g();
};
struct OverrideControl final : OverrideControlBase { // expected-warning {{'final' keyword is incompatible with C++98}}
virtual void f() override; // expected-warning {{'override' keyword is incompatible with C++98}}
virtual void g() final; // expected-warning {{'final' keyword is incompatible with C++98}}
};
using AliasDecl = int; // expected-warning {{alias declarations are incompatible with C++98}}
template<typename T> using AliasTemplate = T; // expected-warning {{alias declarations are incompatible with C++98}}
inline namespace InlineNS { // expected-warning {{inline namespaces are incompatible with C++98}}
}
auto auto_deduction = 0; // expected-warning {{'auto' type specifier is incompatible with C++98}}
int *p = new auto(0); // expected-warning {{'auto' type specifier is incompatible with C++98}}
const int align_of = alignof(int); // expected-warning {{alignof expressions are incompatible with C++98}}
char16_t c16 = 0; // expected-warning {{'char16_t' type specifier is incompatible with C++98}}
char32_t c32 = 0; // expected-warning {{'char32_t' type specifier is incompatible with C++98}}
constexpr int const_expr = 0; // expected-warning {{'constexpr' specifier is incompatible with C++98}}
decltype(const_expr) decl_type = 0; // expected-warning {{'decltype' type specifier is incompatible with C++98}}
__decltype(const_expr) decl_type2 = 0; // ok
void no_except() noexcept; // expected-warning {{noexcept specifications are incompatible with C++98}}
bool no_except_expr = noexcept(1 + 1); // expected-warning {{noexcept expressions are incompatible with C++98}}
void *null = nullptr; // expected-warning {{'nullptr' is incompatible with C++98}}
static_assert(true, "!"); // expected-warning {{static_assert declarations are incompatible with C++98}}
struct InhCtorBase {
InhCtorBase(int);
};
struct InhCtorDerived : InhCtorBase {
using InhCtorBase::InhCtorBase; // expected-warning {{inheriting constructors are incompatible with C++98}}
};
struct FriendMember {
static void MemberFn();
friend void FriendMember::MemberFn(); // expected-warning {{friend declaration naming a member of the declaring class is incompatible with C++98}}
};
struct DelegCtor {
DelegCtor(int) : DelegCtor() {} // expected-warning {{delegating constructors are incompatible with C++98}}
DelegCtor();
};
template<int n = 0> void DefaultFuncTemplateArg(); // expected-warning {{default template arguments for a function template are incompatible with C++98}}
template<typename T> int TemplateFn(T) { return 0; }
void LocalTemplateArg() {
struct S {};
TemplateFn(S()); // expected-warning {{local type 'S' as template argument is incompatible with C++98}}
}
struct {} obj_of_unnamed_type; // expected-note {{here}}
int UnnamedTemplateArg = TemplateFn(obj_of_unnamed_type); // expected-warning {{unnamed type as template argument is incompatible with C++98}}
// FIXME: We do not implement C++98 compatibility warnings for the C++17
// template argument evaluation rules.
#ifndef CXX17COMPAT
namespace RedundantParensInAddressTemplateParam {
int n;
template<int*p> struct S {};
S<(&n)> s; // expected-warning {{redundant parentheses surrounding address non-type template argument are incompatible with C++98}}
S<(((&n)))> t; // expected-warning {{redundant parentheses surrounding address non-type template argument are incompatible with C++98}}
}
#endif
namespace TemplateSpecOutOfScopeNs {
template<typename T> struct S {};
}
template<> struct TemplateSpecOutOfScopeNs::S<char> {};
struct Typename {
template<typename T> struct Inner {};
};
typename ::Typename TypenameOutsideTemplate(); // expected-warning {{use of 'typename' outside of a template is incompatible with C++98}}
Typename::template Inner<int> TemplateOutsideTemplate(); // expected-warning {{use of 'template' keyword outside of a template is incompatible with C++98}}
struct TrivialButNonPOD {
int f(int);
private:
int k;
};
void Ellipsis(int n, ...);
void TrivialButNonPODThroughEllipsis() {
Ellipsis(1, TrivialButNonPOD()); // expected-warning {{passing object of trivial but non-POD type 'TrivialButNonPOD' through variadic function is incompatible with C++98}}
}
struct HasExplicitConversion {
explicit operator bool(); // expected-warning {{explicit conversion functions are incompatible with C++98}}
};
struct Struct {};
enum Enum { enum_val = 0 };
struct BadFriends {
friend enum ::Enum; // expected-warning {{befriending enumeration type 'enum ::Enum' is incompatible with C++98}}
friend int; // expected-warning {{non-class friend type 'int' is incompatible with C++98}}
friend Struct; // expected-warning {{befriending 'Struct' without 'struct' keyword is incompatible with C++98}}
};
int n = {}; // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
class PrivateMember {
struct ImPrivate {};
};
template<typename T> typename T::ImPrivate SFINAEAccessControl(T t) { // expected-warning {{substitution failure due to access control is incompatible with C++98}}
return typename T::ImPrivate();
}
int SFINAEAccessControl(...) { return 0; }
int CheckSFINAEAccessControl = SFINAEAccessControl(PrivateMember()); // expected-note {{while substituting deduced template arguments into function template 'SFINAEAccessControl' [with T = PrivateMember]}}
namespace UnionOrAnonStructMembers {
struct NonTrivCtor {
NonTrivCtor(); // expected-note 2{{user-provided default constructor}}
};
struct NonTrivCopy {
NonTrivCopy(const NonTrivCopy&); // expected-note 2{{user-provided copy constructor}}
};
struct NonTrivDtor {
~NonTrivDtor(); // expected-note 2{{user-provided destructor}}
};
union BadUnion {
NonTrivCtor ntc; // expected-warning {{union member 'ntc' with a non-trivial default constructor is incompatible with C++98}}
NonTrivCopy ntcp; // expected-warning {{union member 'ntcp' with a non-trivial copy constructor is incompatible with C++98}}
NonTrivDtor ntd; // expected-warning {{union member 'ntd' with a non-trivial destructor is incompatible with C++98}}
};
struct Wrap {
struct {
NonTrivCtor ntc; // expected-warning {{anonymous struct member 'ntc' with a non-trivial default constructor is incompatible with C++98}}
NonTrivCopy ntcp; // expected-warning {{anonymous struct member 'ntcp' with a non-trivial copy constructor is incompatible with C++98}}
NonTrivDtor ntd; // expected-warning {{anonymous struct member 'ntd' with a non-trivial destructor is incompatible with C++98}}
};
};
union WithStaticDataMember {
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}}
static const int n = 0; // expected-warning {{static data member 'n' in union is incompatible with C++98}}
static int k; // expected-warning {{static data member 'k' in union is incompatible with C++98}}
};
}
int EnumNNS = Enum::enum_val; // expected-warning {{enumeration type in nested name specifier is incompatible with C++98}}
template<typename T> void EnumNNSFn() {
int k = T::enum_val; // expected-warning {{enumeration type in nested name specifier is incompatible with C++98}}
};
template void EnumNNSFn<Enum>(); // expected-note {{in instantiation}}
void JumpDiagnostics(int n) {
goto DirectJump; // expected-warning {{jump from this goto statement to its label is incompatible with C++98}}
TrivialButNonPOD tnp1; // expected-note {{jump bypasses initialization of non-POD variable}}
DirectJump:
void *Table[] = {&&DirectJump, &&Later};
goto *Table[n]; // expected-warning {{jump from this indirect goto statement to one of its possible targets is incompatible with C++98}}
TrivialButNonPOD tnp2; // expected-note {{jump bypasses initialization of non-POD variable}}
Later: // expected-note {{possible target of indirect goto statement}}
switch (n) {
TrivialButNonPOD tnp3; // expected-note {{jump bypasses initialization of non-POD variable}}
default: // expected-warning {{jump from switch statement to this case label is incompatible with C++98}}
return;
}
}
namespace UnevaluatedMemberAccess {
struct S {
int n;
int f() { return sizeof(S::n); } // ok
};
int k = sizeof(S::n); // expected-warning {{use of non-static data member 'n' in an unevaluated context is incompatible with C++98}}
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}}
}
namespace LiteralUCNs {
char c1 = '\u001e'; // expected-warning {{universal character name referring to a control character is incompatible with C++98}}
wchar_t c2 = L'\u0041'; // expected-warning {{specifying character 'A' with a universal character name is incompatible with C++98}}
const char *s1 = "foo\u0031"; // expected-warning {{specifying character '1' with a universal character name is incompatible with C++98}}
const wchar_t *s2 = L"bar\u0085"; // expected-warning {{universal character name referring to a control character is incompatible with C++98}}
}
// FIXME: We do not implement C++98 compatibility warnings for the C++17
// template argument evaluation rules.
#ifndef CXX17COMPAT
namespace NonTypeTemplateArgs {
template<typename T, T v> struct S {};
const int k = 5; // expected-note {{here}}
static void f() {} // expected-note {{here}}
S<const int&, k> s1; // expected-warning {{non-type template argument referring to object 'k' with internal linkage is incompatible with C++98}}
S<void(&)(), f> s2; // expected-warning {{non-type template argument referring to function 'f' with internal linkage is incompatible with C++98}}
}
namespace NullPointerTemplateArg {
struct A {};
template<int*> struct X {};
template<int A::*> struct Y {};
X<(int*)0> x; // expected-warning {{use of null pointer as non-type template argument is incompatible with C++98}}
Y<(int A::*)0> y; // expected-warning {{use of null pointer as non-type template argument is incompatible with C++98}}
}
#endif
namespace PR13480 {
struct basic_iterator {
basic_iterator(const basic_iterator &it) {} // expected-note {{because type 'PR13480::basic_iterator' has a user-provided copy constructor}}
basic_iterator(basic_iterator &it) {}
};
union test {
basic_iterator it; // expected-warning {{union member 'it' with a non-trivial copy constructor is incompatible with C++98}}
};
}
namespace AssignOpUnion {
struct a {
void operator=(const a &it) {} // expected-note {{because type 'AssignOpUnion::a' has a user-provided copy assignment operator}}
void operator=(a &it) {}
};
struct b {
void operator=(const b &it) {} // expected-note {{because type 'AssignOpUnion::b' has a user-provided copy assignment operator}}
};
union test1 {
a x; // expected-warning {{union member 'x' with a non-trivial copy assignment operator is incompatible with C++98}}
b y; // expected-warning {{union member 'y' with a non-trivial copy assignment operator is incompatible with C++98}}
};
}
namespace rdar11736429 {
struct X { // expected-note {{because type 'rdar11736429::X' has no default constructor}}
X(const X&) = delete; // expected-warning{{deleted function definitions are incompatible with C++98}} \
// expected-note {{implicit default constructor suppressed by user-declared constructor}}
};
union S {
X x; // expected-warning{{union member 'x' with a non-trivial default constructor is incompatible with C++98}}
};
}
template<typename T> T var = T(10);
#ifdef CXX14COMPAT
// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
#else
// expected-warning@-4 {{variable templates are a C++14 extension}}
#endif
// No diagnostic for specializations of variable templates; we will have
// diagnosed the primary template.
template<typename T> T* var<T*> = new T();
template<> int var<int> = 10;
template char var<char>;
float fvar = var<float>;
class A {
template<typename T> static T var = T(10);
#ifdef CXX14COMPAT
// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
#else
// expected-warning@-4 {{variable templates are a C++14 extension}}
#endif
template<typename T> static T* var<T*> = new T();
};
struct B { template<typename T> static T v; };
#ifdef CXX14COMPAT
// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
#else
// expected-warning@-4 {{variable templates are a C++14 extension}}
#endif
template<typename T> T B::v = T();
#ifdef CXX14COMPAT
// expected-warning@-2 {{variable templates are incompatible with C++ standards before C++14}}
#else
// expected-warning@-4 {{variable templates are a C++14 extension}}
#endif
template<typename T> T* B::v<T*> = new T();
template<> int B::v<int> = 10;
template char B::v<char>;
float fsvar = B::v<float>;
#ifdef CXX14COMPAT
int digit_seps = 123'456; // expected-warning {{digit separators are incompatible with C++ standards before C++14}}
#endif
#ifdef CXX17COMPAT
template<class T> struct CTAD {};
void ctad_test() {
CTAD<int> s;
CTAD t = s; // expected-warning {{class template argument deduction is incompatible with C++ standards before C++17}}
}
#endif
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