On Tue, Oct 2, 2018 at 12:02 PM, Hans Wennborg <h...@chromium.org> wrote:
> I'm confused about what implicitly deleted means. In this code for example:
>
> struct S {
> S(const S&) = default;
> S& operator=(const S&) = default;
> const int x;
> };
>
> void f(S &s) {
> S t = s;
> }
>
> Clang will warn that operator= is implicitly deleted.
>
> But it seems the code still works fine, whereas if operator= were
> actually deleted it would not compile. So what does implicitly deleted
> mean then?
Oh, I see, my example is wrong. The assignment operator really is
deleted and it uses the copy constructor instead.
>
>
> On Fri, Sep 28, 2018 at 3:16 AM, Richard Smith via cfe-commits
> <cfe-commits@lists.llvm.org> wrote:
>> Author: rsmith
>> Date: Thu Sep 27 18:16:43 2018
>> New Revision: 343285
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=343285&view=rev
>> Log:
>> [cxx2a] P0641R2: (Some) type mismatches on defaulted functions only
>> render the function deleted instead of rendering the program ill-formed.
>>
>> This change also adds an enabled-by-default warning for the case where
>> an explicitly-defaulted special member function of a non-template class
>> is implicitly deleted by the type checking rules. (This fires either due
>> to this language change or due to pre-C++20 reasons for the member being
>> implicitly deleted). I've tested this on a large codebase and found only
>> bugs (where the program means something that's clearly different from
>> what the programmer intended), so this is enabled by default, but we
>> should revisit this if there are problems with this being enabled by
>> default.
>>
>> Modified:
>> cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
>> cfe/trunk/lib/Sema/SemaDeclCXX.cpp
>> cfe/trunk/test/CXX/class.derived/class.abstract/p16.cpp
>> cfe/trunk/test/CXX/dcl.decl/dcl.fct.def/dcl.fct.def.default/p1.cpp
>> cfe/trunk/test/CXX/drs/dr6xx.cpp
>> cfe/trunk/test/CXX/special/class.copy/p12-0x.cpp
>> cfe/trunk/test/CXX/special/class.copy/p23-cxx11.cpp
>> cfe/trunk/test/CXX/special/class.ctor/p5-0x.cpp
>> cfe/trunk/test/CXX/special/class.dtor/p5-0x.cpp
>> cfe/trunk/test/SemaCUDA/implicit-member-target.cu
>> cfe/trunk/test/SemaCXX/cxx0x-deleted-default-ctor.cpp
>> cfe/trunk/test/SemaCXX/cxx17-compat.cpp
>> cfe/trunk/test/SemaCXX/dr1301.cpp
>> cfe/trunk/test/SemaCXX/microsoft-dtor-lookup-cxx11.cpp
>> cfe/trunk/test/SemaTemplate/exception-spec-crash.cpp
>> cfe/trunk/www/cxx_status.html
>>
>> Modified: cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td (original)
>> +++ cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td Thu Sep 27 18:16:43
>> 2018
>> @@ -7760,9 +7760,19 @@ def err_incorrect_defaulted_exception_sp
>> def err_incorrect_defaulted_constexpr : Error<
>> "defaulted definition of %sub{select_special_member_kind}0 "
>> "is not constexpr">;
>> +def warn_defaulted_method_deleted : Warning<
>> + "explicitly defaulted %sub{select_special_member_kind}0 is implicitly "
>> + "deleted">, InGroup<DiagGroup<"defaulted-function-deleted">>;
>> def err_out_of_line_default_deletes : Error<
>> "defaulting this %sub{select_special_member_kind}0 "
>> "would delete it after its first declaration">;
>> +def note_deleted_type_mismatch : Note<
>> + "function is implicitly deleted because its declared type does not match "
>> + "the type of an implicit %sub{select_special_member_kind}0">;
>> +def warn_cxx17_compat_defaulted_method_type_mismatch : Warning<
>> + "explicitly defaulting this %sub{select_special_member_kind}0 with a type
>> "
>> + "different from the implicit type is incompatible with C++ standards
>> before "
>> + "C++2a">, InGroup<CXXPre2aCompat>, DefaultIgnore;
>> def warn_vbase_moved_multiple_times : Warning<
>> "defaulted move assignment operator of %0 will move assign virtual base "
>> "class %1 multiple times">, InGroup<DiagGroup<"multiple-move-vbase">>;
>>
>> Modified: cfe/trunk/lib/Sema/SemaDeclCXX.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaDeclCXX.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/lib/Sema/SemaDeclCXX.cpp (original)
>> +++ cfe/trunk/lib/Sema/SemaDeclCXX.cpp Thu Sep 27 18:16:43 2018
>> @@ -6451,20 +6451,29 @@ void Sema::CheckExplicitlyDefaultedSpeci
>> // copy operation can take a non-const reference) as an implicit
>> // declaration, and
>> // -- not have default arguments.
>> + // C++2a changes the second bullet to instead delete the function if it's
>> + // defaulted on its first declaration, unless it's "an assignment
>> operator,
>> + // and its return type differs or its parameter type is not a reference".
>> + bool DeleteOnTypeMismatch = getLangOpts().CPlusPlus2a && First;
>> + bool ShouldDeleteForTypeMismatch = false;
>> unsigned ExpectedParams = 1;
>> if (CSM == CXXDefaultConstructor || CSM == CXXDestructor)
>> ExpectedParams = 0;
>> if (MD->getNumParams() != ExpectedParams) {
>> - // This also checks for default arguments: a copy or move constructor
>> with a
>> + // This checks for default arguments: a copy or move constructor with a
>> // default argument is classified as a default constructor, and
>> assignment
>> // operations and destructors can't have default arguments.
>> Diag(MD->getLocation(), diag::err_defaulted_special_member_params)
>> << CSM << MD->getSourceRange();
>> HadError = true;
>> } else if (MD->isVariadic()) {
>> - Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic)
>> - << CSM << MD->getSourceRange();
>> - HadError = true;
>> + if (DeleteOnTypeMismatch)
>> + ShouldDeleteForTypeMismatch = true;
>> + else {
>> + Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic)
>> + << CSM << MD->getSourceRange();
>> + HadError = true;
>> + }
>> }
>>
>> const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>();
>> @@ -6489,9 +6498,13 @@ void Sema::CheckExplicitlyDefaultedSpeci
>>
>> // A defaulted special member cannot have cv-qualifiers.
>> if (Type->getTypeQuals()) {
>> - Diag(MD->getLocation(), diag::err_defaulted_special_member_quals)
>> - << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14;
>> - HadError = true;
>> + if (DeleteOnTypeMismatch)
>> + ShouldDeleteForTypeMismatch = true;
>> + else {
>> + Diag(MD->getLocation(), diag::err_defaulted_special_member_quals)
>> + << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14;
>> + HadError = true;
>> + }
>> }
>> }
>>
>> @@ -6504,23 +6517,30 @@ void Sema::CheckExplicitlyDefaultedSpeci
>> HasConstParam = ReferentType.isConstQualified();
>>
>> if (ReferentType.isVolatileQualified()) {
>> - Diag(MD->getLocation(),
>> - diag::err_defaulted_special_member_volatile_param) << CSM;
>> - HadError = true;
>> + if (DeleteOnTypeMismatch)
>> + ShouldDeleteForTypeMismatch = true;
>> + else {
>> + Diag(MD->getLocation(),
>> + diag::err_defaulted_special_member_volatile_param) << CSM;
>> + HadError = true;
>> + }
>> }
>>
>> if (HasConstParam && !CanHaveConstParam) {
>> - if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) {
>> + if (DeleteOnTypeMismatch)
>> + ShouldDeleteForTypeMismatch = true;
>> + else if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) {
>> Diag(MD->getLocation(),
>> diag::err_defaulted_special_member_copy_const_param)
>> << (CSM == CXXCopyAssignment);
>> // FIXME: Explain why this special member can't be const.
>> + HadError = true;
>> } else {
>> Diag(MD->getLocation(),
>> diag::err_defaulted_special_member_move_const_param)
>> << (CSM == CXXMoveAssignment);
>> + HadError = true;
>> }
>> - HadError = true;
>> }
>> } else if (ExpectedParams) {
>> // A copy assignment operator can take its argument by value, but a
>> @@ -6582,14 +6602,27 @@ void Sema::CheckExplicitlyDefaultedSpeci
>> EPI));
>> }
>>
>> - if (ShouldDeleteSpecialMember(MD, CSM)) {
>> + if (ShouldDeleteForTypeMismatch || ShouldDeleteSpecialMember(MD, CSM)) {
>> if (First) {
>> SetDeclDeleted(MD, MD->getLocation());
>> + if (!inTemplateInstantiation() && !HadError) {
>> + Diag(MD->getLocation(), diag::warn_defaulted_method_deleted) << CSM;
>> + if (ShouldDeleteForTypeMismatch) {
>> + Diag(MD->getLocation(), diag::note_deleted_type_mismatch) << CSM;
>> + } else {
>> + ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true);
>> + }
>> + }
>> + if (ShouldDeleteForTypeMismatch && !HadError) {
>> + Diag(MD->getLocation(),
>> + diag::warn_cxx17_compat_defaulted_method_type_mismatch) << CSM;
>> + }
>> } else {
>> // C++11 [dcl.fct.def.default]p4:
>> // [For a] user-provided explicitly-defaulted function [...] if
>> such a
>> // function is implicitly defined as deleted, the program is
>> ill-formed.
>> Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM;
>> + assert(!ShouldDeleteForTypeMismatch && "deleted non-first decl");
>> ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true);
>> HadError = true;
>> }
>>
>> Modified: cfe/trunk/test/CXX/class.derived/class.abstract/p16.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/class.derived/class.abstract/p16.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/CXX/class.derived/class.abstract/p16.cpp (original)
>> +++ cfe/trunk/test/CXX/class.derived/class.abstract/p16.cpp Thu Sep 27
>> 18:16:43 2018
>> @@ -44,8 +44,8 @@ struct G : D {};
>> // expected-error@-3 {{deleted function 'operator=' cannot override a
>> non-deleted function}}
>> // expected-note@-4 {{while declaring the implicit move assignment operator
>> for 'G'}}
>> // expected-note@-5 {{move assignment operator of 'G' is implicitly deleted
>> because base class 'D' has an inaccessible move assignment operator}}
>> -struct H : D {
>> - H &operator=(H&&) = default;
>> +struct H : D { // expected-note {{deleted because base class 'D' has an
>> inaccessible move assignment}}
>> + H &operator=(H&&) = default; // expected-warning {{implicitly deleted}}
>> // expected-error@-1 {{deleted function 'operator=' cannot override a
>> non-deleted function}}
>> // expected-note@-3 {{move assignment operator of 'H' is implicitly
>> deleted because base class 'D' has an inaccessible move assignment operator}}
>> ~H();
>>
>> Modified: cfe/trunk/test/CXX/dcl.decl/dcl.fct.def/dcl.fct.def.default/p1.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/dcl.decl/dcl.fct.def/dcl.fct.def.default/p1.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/CXX/dcl.decl/dcl.fct.def/dcl.fct.def.default/p1.cpp
>> (original)
>> +++ cfe/trunk/test/CXX/dcl.decl/dcl.fct.def/dcl.fct.def.default/p1.cpp Thu
>> Sep 27 18:16:43 2018
>> @@ -1,15 +1,30 @@
>> // RUN: %clang_cc1 -verify %s -std=c++11
>> +// RUN: %clang_cc1 -verify %s -std=c++17
>> +// RUN: %clang_cc1 -verify %s -std=c++2a
>>
>> // A function that is explicitly defaulted shall
>> struct A {
>> // -- be a special member function,
>> A(int) = default; // expected-error {{only special member functions may
>> be defaulted}}
>> + A(A) = default; // expected-error {{must pass its first argument by
>> reference}}
>>
>> // -- have the same declared function type as if it had been implicitly
>> // declared
>> void operator=(const A &) = default; // expected-error {{must return 'A
>> &'}}
>> - A(...) = default; // expected-error {{cannot be variadic}}
>> - A(const A &, ...) = default; // expected-error {{cannot be variadic}}
>> + A(...) = default;
>> + A(const A &, ...) = default;
>> + A &operator=(const A&) const = default;
>> + A &operator=(A) const = default; // expected-error {{must be an lvalue
>> refe}}
>> +#if __cplusplus <= 201703L
>> + // expected-error@-5 {{cannot be variadic}}
>> + // expected-error@-5 {{cannot be variadic}}
>> + // expected-error@-5 {{may not have 'const'}}
>> + // expected-error@-5 {{may not have 'const'}}
>> +#else
>> + // expected-warning@-10 {{implicitly deleted}} expected-note@-10
>> {{declared type does not match the type of an implicit default constructor}}
>> + // expected-warning@-10 {{implicitly deleted}} expected-note@-10
>> {{declared type does not match the type of an implicit copy constructor}}
>> + // expected-warning@-10 {{implicitly deleted}} expected-note@-10
>> {{declared type does not match the type of an implicit copy assignment}}
>> +#endif
>>
>> // (except for possibly differing ref-qualifiers
>> A &operator=(A &&) & = default;
>> @@ -23,3 +38,35 @@ struct A {
>> A(double = 0.0) = default; // expected-error {{cannot have default
>> arguments}}
>> A(const A & = 0) = default; // expected-error {{cannot have default
>> arguments}}
>> };
>> +
>> +struct A2 {
>> + A2(...);
>> + A2(const A2 &, ...);
>> + A2 &operator=(const A2&) const;
>> +};
>> +A2::A2(...) = default; // expected-error {{cannot be variadic}}
>> +A2::A2(const A2&, ...) = default; // expected-error {{cannot be variadic}}
>> +A2 &A2::operator=(const A2&) const = default; // expected-error {{may not
>> have 'const'}}
>> +
>> +struct B {
>> + B(B&);
>> + B &operator=(B&);
>> +};
>> +struct C : B {
>> + C(const C&) = default;
>> + C &operator=(const C&) = default;
>> +#if __cplusplus <= 201703L
>> + // expected-error@-3 {{is const, but a member or base requires it to be
>> non-const}}
>> + // expected-error@-3 {{is const, but a member or base requires it to be
>> non-const}}
>> +#else
>> + // expected-warning@-6 {{implicitly deleted}} expected-note@-6 {{type
>> does not match}}
>> + // expected-warning@-6 {{implicitly deleted}} expected-note@-6 {{type
>> does not match}}
>> +#endif
>> +};
>> +
>> +struct D : B { // expected-note 2{{base class}}
>> + D(const D&);
>> + D &operator=(const D&);
>> +};
>> +D::D(const D&) = default; // expected-error {{would delete}} expected-error
>> {{is const, but}}
>> +D &D::operator=(const D&) = default; // expected-error {{would delete}}
>> expected-error {{is const, but}}
>>
>> Modified: cfe/trunk/test/CXX/drs/dr6xx.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/drs/dr6xx.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/CXX/drs/dr6xx.cpp (original)
>> +++ cfe/trunk/test/CXX/drs/dr6xx.cpp Thu Sep 27 18:16:43 2018
>> @@ -757,8 +757,8 @@ namespace dr666 { // dr666: yes
>> #if __cplusplus >= 201103L
>> namespace dr667 { // dr667: yes
>> struct A {
>> - A() = default;
>> - int &r;
>> + A() = default; // expected-warning {{explicitly defaulted default
>> constructor is implicitly deleted}}
>> + int &r; // expected-note {{because field 'r' of reference type 'int &'
>> would not be initialized}}
>> };
>> static_assert(!__is_trivially_constructible(A), "");
>>
>>
>> Modified: cfe/trunk/test/CXX/special/class.copy/p12-0x.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/special/class.copy/p12-0x.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/CXX/special/class.copy/p12-0x.cpp (original)
>> +++ cfe/trunk/test/CXX/special/class.copy/p12-0x.cpp Thu Sep 27 18:16:43 2018
>> @@ -1,4 +1,4 @@
>> -// RUN: %clang_cc1 -std=c++11 -verify %s
>> +// RUN: %clang_cc1 -std=c++11 -verify %s -Wno-defaulted-function-deleted
>>
>> // expected-no-diagnostics
>>
>>
>> Modified: cfe/trunk/test/CXX/special/class.copy/p23-cxx11.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/special/class.copy/p23-cxx11.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/CXX/special/class.copy/p23-cxx11.cpp (original)
>> +++ cfe/trunk/test/CXX/special/class.copy/p23-cxx11.cpp Thu Sep 27 18:16:43
>> 2018
>> @@ -1,4 +1,4 @@
>> -// RUN: %clang_cc1 -verify %s -std=c++11
>> +// RUN: %clang_cc1 -verify %s -std=c++11 -Wno-defaulted-function-deleted
>>
>> struct Trivial {};
>>
>>
>> Modified: cfe/trunk/test/CXX/special/class.ctor/p5-0x.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/special/class.ctor/p5-0x.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/CXX/special/class.ctor/p5-0x.cpp (original)
>> +++ cfe/trunk/test/CXX/special/class.ctor/p5-0x.cpp Thu Sep 27 18:16:43 2018
>> @@ -1,4 +1,4 @@
>> -// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11
>> +// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11
>> -Wno-defaulted-function-deleted
>>
>> struct DefaultedDefCtor1 {};
>> struct DefaultedDefCtor2 { DefaultedDefCtor2() = default; };
>>
>> Modified: cfe/trunk/test/CXX/special/class.dtor/p5-0x.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/special/class.dtor/p5-0x.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/CXX/special/class.dtor/p5-0x.cpp (original)
>> +++ cfe/trunk/test/CXX/special/class.dtor/p5-0x.cpp Thu Sep 27 18:16:43 2018
>> @@ -1,4 +1,4 @@
>> -// RUN: %clang_cc1 -verify -std=c++11 %s
>> +// RUN: %clang_cc1 -verify -std=c++11 %s -Wno-defaulted-function-deleted
>>
>> struct NonTrivDtor {
>> ~NonTrivDtor();
>>
>> Modified: cfe/trunk/test/SemaCUDA/implicit-member-target.cu
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCUDA/implicit-member-target.cu?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/SemaCUDA/implicit-member-target.cu (original)
>> +++ cfe/trunk/test/SemaCUDA/implicit-member-target.cu Thu Sep 27 18:16:43
>> 2018
>> @@ -1,4 +1,4 @@
>> -// RUN: %clang_cc1 -std=gnu++11 -fsyntax-only -verify %s
>> +// RUN: %clang_cc1 -std=gnu++11 -fsyntax-only -verify %s
>> -Wno-defaulted-function-deleted
>>
>> #include "Inputs/cuda.h"
>>
>>
>> Modified: cfe/trunk/test/SemaCXX/cxx0x-deleted-default-ctor.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/cxx0x-deleted-default-ctor.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/SemaCXX/cxx0x-deleted-default-ctor.cpp (original)
>> +++ cfe/trunk/test/SemaCXX/cxx0x-deleted-default-ctor.cpp Thu Sep 27
>> 18:16:43 2018
>> @@ -59,7 +59,7 @@ struct good_const {
>> good_const gc;
>>
>> struct no_default {
>> - no_default() = delete; // expected-note 4{{deleted here}}
>> + no_default() = delete; // expected-note 5{{deleted here}}
>> };
>> struct no_dtor {
>> ~no_dtor() = delete; // expected-note 2{{deleted here}}
>> @@ -108,8 +108,8 @@ struct has_friend {
>> has_friend hf;
>>
>> struct defaulted_delete {
>> - no_default nd; // expected-note {{because field 'nd' has a deleted
>> default constructor}}
>> - defaulted_delete() = default; // expected-note{{implicitly deleted here}}
>> + no_default nd; // expected-note 2{{because field 'nd' has a deleted
>> default constructor}}
>> + defaulted_delete() = default; // expected-note{{implicitly deleted here}}
>> expected-warning {{implicitly deleted}}
>> };
>> defaulted_delete dd; // expected-error {{call to implicitly-deleted default
>> constructor}}
>>
>>
>> Modified: cfe/trunk/test/SemaCXX/cxx17-compat.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/cxx17-compat.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/SemaCXX/cxx17-compat.cpp (original)
>> +++ cfe/trunk/test/SemaCXX/cxx17-compat.cpp Thu Sep 27 18:16:43 2018
>> @@ -1,5 +1,5 @@
>> // RUN: %clang_cc1 -fsyntax-only -std=c++17 -pedantic -verify %s
>> -// RUN: %clang_cc1 -fsyntax-only -std=c++2a -Wc++17-compat-pedantic -verify
>> %s
>> +// RUN: %clang_cc1 -fsyntax-only -std=c++2a -Wc++17-compat-pedantic -verify
>> %s -Wno-defaulted-function-deleted
>>
>> struct A {};
>> int (A::*pa)() const&;
>> @@ -42,3 +42,15 @@ void copy_lambda() { Lambda = Lambda; }
>> #else
>> // expected-warning@-4 {{assignment of lambda is incompatible with C++
>> standards before C++2a}}
>> #endif
>> +
>> +struct DefaultDeleteWrongTypeBase {
>> + DefaultDeleteWrongTypeBase(DefaultDeleteWrongTypeBase&);
>> +};
>> +struct DefaultDeleteWrongType : DefaultDeleteWrongTypeBase {
>> + DefaultDeleteWrongType(const DefaultDeleteWrongType&) = default;
>> +#if __cplusplus <= 201703L
>> + // expected-error@-2 {{a member or base requires it to be non-const}}
>> +#else
>> + // expected-warning@-4 {{explicitly defaulting this copy constructor
>> with a type different from the implicit type is incompatible with C++
>> standards before C++2a}}
>> +#endif
>> +};
>>
>> Modified: cfe/trunk/test/SemaCXX/dr1301.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/dr1301.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/SemaCXX/dr1301.cpp (original)
>> +++ cfe/trunk/test/SemaCXX/dr1301.cpp Thu Sep 27 18:16:43 2018
>> @@ -6,7 +6,7 @@ struct A { // expected-note 2{{candidate
>> int a = A().n; // expected-error {{no matching constructor}}
>>
>> struct B {
>> - B() = delete; // expected-note 3{{here}}
>> + B() = delete; // expected-note 4{{here}}
>> int n;
>> };
>> int b = B().n; // expected-error {{call to deleted}}
>> @@ -17,8 +17,8 @@ struct C {
>> int c = C().b.n; // expected-error {{call to implicitly-deleted default}}
>>
>> struct D {
>> - D() = default; // expected-note {{here}}
>> - B b; // expected-note {{'b' has a deleted default constructor}}
>> + D() = default; // expected-note {{here}} expected-warning {{implicitly
>> deleted}}
>> + B b; // expected-note 2{{'b' has a deleted default constructor}}
>> };
>> int d = D().b.n; // expected-error {{call to implicitly-deleted default}}
>>
>>
>> Modified: cfe/trunk/test/SemaCXX/microsoft-dtor-lookup-cxx11.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/microsoft-dtor-lookup-cxx11.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/SemaCXX/microsoft-dtor-lookup-cxx11.cpp (original)
>> +++ cfe/trunk/test/SemaCXX/microsoft-dtor-lookup-cxx11.cpp Thu Sep 27
>> 18:16:43 2018
>> @@ -6,8 +6,8 @@ struct S {
>> void operator delete(void*, double);
>> } s; // expected-error {{attempt to use a deleted function}}
>>
>> -struct T { // expected-note{{virtual destructor requires an unambiguous,
>> accessible 'operator delete'}}
>> - virtual ~T() = default; // expected-note {{explicitly defaulted function
>> was implicitly deleted here}}
>> +struct T { // expected-note 2{{virtual destructor requires an unambiguous,
>> accessible 'operator delete'}}
>> + virtual ~T() = default; // expected-note {{explicitly defaulted function
>> was implicitly deleted here}} expected-warning {{implicitly deleted}}
>> void operator delete(void*, int);
>> void operator delete(void*, double);
>> } t; // expected-error {{attempt to use a deleted function}}
>>
>> Modified: cfe/trunk/test/SemaTemplate/exception-spec-crash.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaTemplate/exception-spec-crash.cpp?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/test/SemaTemplate/exception-spec-crash.cpp (original)
>> +++ cfe/trunk/test/SemaTemplate/exception-spec-crash.cpp Thu Sep 27 18:16:43
>> 2018
>> @@ -1,5 +1,5 @@
>> -// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
>> -// RUN: %clang_cc1 -std=c++11 -fcxx-exceptions -DCXX_EXCEPTIONS
>> -fsyntax-only -verify %s
>> +// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
>> -Wno-defaulted-function-deleted
>> +// RUN: %clang_cc1 -std=c++11 -fcxx-exceptions -DCXX_EXCEPTIONS
>> -fsyntax-only -verify %s -Wno-defaulted-function-deleted
>>
>> template <class _Tp> struct is_nothrow_move_constructible {
>> static const bool value = false;
>>
>> Modified: cfe/trunk/www/cxx_status.html
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/www/cxx_status.html?rev=343285&r1=343284&r2=343285&view=diff
>> ==============================================================================
>> --- cfe/trunk/www/cxx_status.html (original)
>> +++ cfe/trunk/www/cxx_status.html Thu Sep 27 18:16:43 2018
>> @@ -884,7 +884,7 @@ as the draft C++2a standard evolves.
>> <tr>
>> <td><tt>const</tt> mismatch with defaulted copy constructor</td>
>> <td><a href="http://wg21.link/p0641r2";>P0641R2</a></td>
>> - <td class="none" align="center">No</td>
>> + <td class="svn" align="center">SVN</td>
>> </tr>
>> <tr>
>> <td rowspan="3">Consistent comparison
>> (<tt>operator<=></tt>)</td>
>>
>>
>> _______________________________________________
>> cfe-commits mailing list
>> cfe-commits@lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
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