https://github.com/shashi1687 updated https://github.com/llvm/llvm-project/pull/147400
>From 29c3c9c6d25cc7c47d01a9d819ea37e92361aea2 Mon Sep 17 00:00:00 2001 From: Shashi Shankar <shashishankar1...@gmail.com> Date: Mon, 7 Jul 2025 22:54:22 +0200 Subject: [PATCH 1/3] Sema: suppress deprecated field warnings in implicit special-member functions Only explicit uses of deprecated fields should warn. Defaulted constructors and copy/move assignment operators (when implicitly generated) no longer trigger -Wdeprecated-declarations. * In SemaExpr.cpp, early-return in DiagnoseUseOfDecl for implicit SM. * Add lit regression test in clang/test/SemaCXX/deprecated-no-implicit-warning.cpp. Fixes: https://github.com/llvm/llvm-project/issues/147293 Signed-off-by: Shashi Shankar <shashishankar1...@gmail.com> --- clang/lib/Sema/SemaAvailability.cpp | 22 +++++++++++++++++ .../implicit-special-member-deprecated.cpp | 24 +++++++++++++++++++ 2 files changed, 46 insertions(+) create mode 100644 clang/test/Sema/implicit-special-member-deprecated.cpp diff --git a/clang/lib/Sema/SemaAvailability.cpp b/clang/lib/Sema/SemaAvailability.cpp index 8c6a17301fba6..a3ff53abd3188 100644 --- a/clang/lib/Sema/SemaAvailability.cpp +++ b/clang/lib/Sema/SemaAvailability.cpp @@ -452,6 +452,28 @@ static void DoEmitAvailabilityWarning(Sema &S, AvailabilityResult K, } } } + // Suppress -Wdeprecated-declarations in purely implicit special-member functions. + if (K == AR_Deprecated) { + if (const FunctionDecl *FD = S.getCurFunctionDecl()) { + // Implicit, defaulted constructor (default / copy / move) + if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) { + if (CD->isImplicit() && CD->isDefaulted()) + return; + } + //Implicit, defaulted destructor + if (auto *DD = dyn_cast<CXXDestructorDecl>(FD)) { + if (DD->isImplicit() && DD->isDefaulted()) + return; + } + //Implicit copy- or move-assignment operator + if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { + if (MD->isImplicit() && + (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())) + return; + } + } + } + switch (K) { case AR_NotYetIntroduced: { diff --git a/clang/test/Sema/implicit-special-member-deprecated.cpp b/clang/test/Sema/implicit-special-member-deprecated.cpp new file mode 100644 index 0000000000000..f65fc5171eaab --- /dev/null +++ b/clang/test/Sema/implicit-special-member-deprecated.cpp @@ -0,0 +1,24 @@ +// clang/test/Sema/implicit-deprecated-special-member.cpp +// RUN: %clang_cc1 -std=c++20 -Wdeprecated-declarations -verify %s + +struct A { + [[deprecated("use something else")]] int x = 42; // expected-note {{has been explicitly marked deprecated here}} +}; + +A makeDefaultA() { // implicit default ctor: no diagnostics + return {}; +} + +A copyA(const A &a) { // implicit copy ctor: no diagnostics + return a; +} + +void assignA() { + A a, b; + a = b; // implicit copy-assign: no diagnostics +} + +void useA() { + A a; + (void)a.x; // expected-warning {{is deprecated}} +} \ No newline at end of file >From 159e35de70a0d4ada07f8f6bc340a2a3d165b463 Mon Sep 17 00:00:00 2001 From: Shashi Shankar <shashishankar1...@gmail.com> Date: Tue, 8 Jul 2025 01:33:39 +0200 Subject: [PATCH 2/3] Docs: add release note for implicit-special-member deprecation fix --- clang/docs/ReleaseNotes.rst | 1 + clang/test/Sema/implicit-special-member-deprecated.cpp | 1 - 2 files changed, 1 insertion(+), 1 deletion(-) diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index 581338924943b..711e45f44ac6e 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -907,6 +907,7 @@ Bug Fixes to C++ Support - Fix a bug where private access specifier of overloaded function not respected. (#GH107629) - Correctly handle allocations in the condition of a ``if constexpr``.(#GH120197) (#GH134820) - Fixed a crash when handling invalid member using-declaration in C++20+ mode. (#GH63254) +- Suppress -Wdeprecated-declarations in implicitly generated special-member functions for deprecated data-members; only explicit uses still warn. (PR #147400, Issue #147293) Bug Fixes to AST Handling ^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/clang/test/Sema/implicit-special-member-deprecated.cpp b/clang/test/Sema/implicit-special-member-deprecated.cpp index f65fc5171eaab..6b0042f5d2bb5 100644 --- a/clang/test/Sema/implicit-special-member-deprecated.cpp +++ b/clang/test/Sema/implicit-special-member-deprecated.cpp @@ -1,4 +1,3 @@ -// clang/test/Sema/implicit-deprecated-special-member.cpp // RUN: %clang_cc1 -std=c++20 -Wdeprecated-declarations -verify %s struct A { >From 1d206a0a8e147230ce82b20ed70f6feb5f2eda65 Mon Sep 17 00:00:00 2001 From: Shashi Shankar <shashishankar1...@gmail.com> Date: Tue, 8 Jul 2025 10:37:41 +0200 Subject: [PATCH 3/3] Sema: move deprecation-suppression into switch, dedupe implicit/defaulted checks - Suppression guard is now inside - Use to coalesce + - Drop PR number from release note --- clang/docs/ReleaseNotes.rst | 2 +- clang/lib/Sema/SemaAvailability.cpp | 30 +++++-------------- .../implicit-special-member-deprecated.cpp | 2 +- 3 files changed, 10 insertions(+), 24 deletions(-) diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index 711e45f44ac6e..12a9db280454b 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -907,7 +907,7 @@ Bug Fixes to C++ Support - Fix a bug where private access specifier of overloaded function not respected. (#GH107629) - Correctly handle allocations in the condition of a ``if constexpr``.(#GH120197) (#GH134820) - Fixed a crash when handling invalid member using-declaration in C++20+ mode. (#GH63254) -- Suppress -Wdeprecated-declarations in implicitly generated special-member functions for deprecated data-members; only explicit uses still warn. (PR #147400, Issue #147293) +- Suppress -Wdeprecated-declarations in implicitly generated special-member functions for deprecated data-members; only explicit uses still warn. (Issue #147293) Bug Fixes to AST Handling ^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/clang/lib/Sema/SemaAvailability.cpp b/clang/lib/Sema/SemaAvailability.cpp index a3ff53abd3188..365be360b6ce2 100644 --- a/clang/lib/Sema/SemaAvailability.cpp +++ b/clang/lib/Sema/SemaAvailability.cpp @@ -452,28 +452,6 @@ static void DoEmitAvailabilityWarning(Sema &S, AvailabilityResult K, } } } - // Suppress -Wdeprecated-declarations in purely implicit special-member functions. - if (K == AR_Deprecated) { - if (const FunctionDecl *FD = S.getCurFunctionDecl()) { - // Implicit, defaulted constructor (default / copy / move) - if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) { - if (CD->isImplicit() && CD->isDefaulted()) - return; - } - //Implicit, defaulted destructor - if (auto *DD = dyn_cast<CXXDestructorDecl>(FD)) { - if (DD->isImplicit() && DD->isDefaulted()) - return; - } - //Implicit copy- or move-assignment operator - if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { - if (MD->isImplicit() && - (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())) - return; - } - } - } - switch (K) { case AR_NotYetIntroduced: { @@ -569,6 +547,14 @@ static void DoEmitAvailabilityWarning(Sema &S, AvailabilityResult K, return; } case AR_Deprecated: + // Suppress -Wdeprecated-declarations in purely implicit special-member + // functions. + if (auto *MD = dyn_cast_if_present<CXXMethodDecl>(S.getCurFunctionDecl()); + MD && MD->isImplicit() && MD->isDefaulted() && + (isa<CXXConstructorDecl, CXXDestructorDecl>(MD) || + MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())) { + return; + } if (ObjCPropertyAccess) diag = diag::warn_property_method_deprecated; else if (S.currentEvaluationContext().IsCaseExpr) diff --git a/clang/test/Sema/implicit-special-member-deprecated.cpp b/clang/test/Sema/implicit-special-member-deprecated.cpp index 6b0042f5d2bb5..13ab029444364 100644 --- a/clang/test/Sema/implicit-special-member-deprecated.cpp +++ b/clang/test/Sema/implicit-special-member-deprecated.cpp @@ -20,4 +20,4 @@ void assignA() { void useA() { A a; (void)a.x; // expected-warning {{is deprecated}} -} \ No newline at end of file +} _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
