https://github.com/cor3ntin updated https://github.com/llvm/llvm-project/pull/142975
>From d4294fbb02932ec8b1870ac2960856bbbf299eb5 Mon Sep 17 00:00:00 2001 From: Corentin Jabot <corentinja...@gmail.com> Date: Thu, 5 Jun 2025 16:15:33 +0200 Subject: [PATCH 1/3] [Clang] Implement CWG2496 https://cplusplus.github.io/CWG/issues/2496.html We failed to diagnose the following in C++23 mode ``` struct S { virtual void f(); // expected-note {{previous declaration is here}} }; struct T : S { virtual void f() &; }; ``` --- clang/docs/ReleaseNotes.rst | 2 ++ clang/lib/Sema/SemaOverload.cpp | 2 +- clang/test/CXX/drs/cwg24xx.cpp | 20 ++++++++++++++++++++ clang/www/cxx_dr_status.html | 2 +- 4 files changed, 24 insertions(+), 2 deletions(-) diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index 512071427b65c..d1ee6de66b4ee 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -155,6 +155,8 @@ Resolutions to C++ Defect Reports - Implemented `CWG3005 Function parameters should never be name-independent <https://wg21.link/CWG3005>`_. +- Implemented `CWG2496 ref-qualifiers and virtual overriding <https://wg21.link/CWG2496>`_. + C Language Changes ------------------ diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp index 66f84fc67b52f..5a19dacdc4d84 100644 --- a/clang/lib/Sema/SemaOverload.cpp +++ b/clang/lib/Sema/SemaOverload.cpp @@ -1490,7 +1490,7 @@ static bool IsOverloadOrOverrideImpl(Sema &SemaRef, FunctionDecl *New, // If the function is a class member, its signature includes the // cv-qualifiers (if any) and ref-qualifier (if any) on the function itself. auto DiagnoseInconsistentRefQualifiers = [&]() { - if (SemaRef.LangOpts.CPlusPlus23) + if (SemaRef.LangOpts.CPlusPlus23 && !UseOverrideRules) return false; if (OldMethod->getRefQualifier() == NewMethod->getRefQualifier()) return false; diff --git a/clang/test/CXX/drs/cwg24xx.cpp b/clang/test/CXX/drs/cwg24xx.cpp index 9c9a3f14b9e8b..05b9a74e292ab 100644 --- a/clang/test/CXX/drs/cwg24xx.cpp +++ b/clang/test/CXX/drs/cwg24xx.cpp @@ -215,3 +215,23 @@ void (*q)() throw() = S(); // since-cxx17-error@-1 {{no viable conversion from 'S' to 'void (*)() throw()'}} // since-cxx17-note@#cwg2486-conv {{candidate function}} } // namespace cwg2486 + + +namespace cwg2496 { // cwg2496: 21 +#if __cplusplus >= 201102L +struct S { + virtual void f(); // expected-note {{previous declaration is here}} + virtual void g() &; // expected-note {{previous declaration is here}} + virtual void h(); // expected-note {{previous declaration is here}} +}; + +struct T : S { + virtual void f() &; + // expected-error@-1 {{cannot overload a member function with ref-qualifier '&' with a member function without a ref-qualifier}} + virtual void g(); + // expected-error@-1 {{cannot overload a member function without a ref-qualifier with a member function with ref-qualifier '&'}} + virtual void h() &&; + // expected-error@-1 {{cannot overload a member function with ref-qualifier '&&' with a member function without a ref-qualifier}} +}; +#endif +} diff --git a/clang/www/cxx_dr_status.html b/clang/www/cxx_dr_status.html index 58286db165077..fe9b571b47261 100755 --- a/clang/www/cxx_dr_status.html +++ b/clang/www/cxx_dr_status.html @@ -14811,7 +14811,7 @@ <h2 id="cxxdr">C++ defect report implementation status</h2> <td><a href="https://cplusplus.github.io/CWG/issues/2496.html";>2496</a></td> <td>CD6</td> <td><I>ref-qualifier</I>s and virtual overriding</td> - <td class="unknown" align="center">Unknown</td> + <td class="unreleased" align="center">Clang 21</td> </tr> <tr class="open" id="2497"> <td><a href="https://cplusplus.github.io/CWG/issues/2497.html";>2497</a></td> >From 1f2f57051b5f1d8934e5726e16c99ae6b287d8cf Mon Sep 17 00:00:00 2001 From: Corentin Jabot <corentinja...@gmail.com> Date: Thu, 5 Jun 2025 19:41:54 +0200 Subject: [PATCH 2/3] more tests --- clang/test/CXX/drs/cwg24xx.cpp | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/clang/test/CXX/drs/cwg24xx.cpp b/clang/test/CXX/drs/cwg24xx.cpp index 05b9a74e292ab..a1821e71ff06a 100644 --- a/clang/test/CXX/drs/cwg24xx.cpp +++ b/clang/test/CXX/drs/cwg24xx.cpp @@ -220,18 +220,23 @@ void (*q)() throw() = S(); namespace cwg2496 { // cwg2496: 21 #if __cplusplus >= 201102L struct S { - virtual void f(); // expected-note {{previous declaration is here}} - virtual void g() &; // expected-note {{previous declaration is here}} - virtual void h(); // expected-note {{previous declaration is here}} + virtual void f(); // #cwg2496-f + virtual void g() &; // #cwg2496-g + virtual void h(); // #cwg2496-h + virtual void i(); // #cwg2496-i }; struct T : S { virtual void f() &; // expected-error@-1 {{cannot overload a member function with ref-qualifier '&' with a member function without a ref-qualifier}} + // expected-note@#cwg2496-f {{previous declaration is here}} virtual void g(); // expected-error@-1 {{cannot overload a member function without a ref-qualifier with a member function with ref-qualifier '&'}} + // expected-note@#cwg2496-g {{previous declaration is here}} virtual void h() &&; // expected-error@-1 {{cannot overload a member function with ref-qualifier '&&' with a member function without a ref-qualifier}} + // expected-note@#cwg2496-h {{previous declaration is here}} + virtual void i(); }; #endif } >From 32d10afc7f6128d659a59af18ebc44587eca60cb Mon Sep 17 00:00:00 2001 From: Corentin Jabot <corentinja...@gmail.com> Date: Thu, 5 Jun 2025 19:48:20 +0200 Subject: [PATCH 3/3] more tests --- clang/test/CXX/drs/cwg24xx.cpp | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/clang/test/CXX/drs/cwg24xx.cpp b/clang/test/CXX/drs/cwg24xx.cpp index a1821e71ff06a..5c07fc18e1ec2 100644 --- a/clang/test/CXX/drs/cwg24xx.cpp +++ b/clang/test/CXX/drs/cwg24xx.cpp @@ -223,7 +223,9 @@ struct S { virtual void f(); // #cwg2496-f virtual void g() &; // #cwg2496-g virtual void h(); // #cwg2496-h - virtual void i(); // #cwg2496-i + virtual void i(); + virtual void j() &; + virtual void k() &&; }; struct T : S { @@ -237,6 +239,8 @@ struct T : S { // expected-error@-1 {{cannot overload a member function with ref-qualifier '&&' with a member function without a ref-qualifier}} // expected-note@#cwg2496-h {{previous declaration is here}} virtual void i(); + virtual void j() &; + virtual void k() &; }; #endif } _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
