[clang] [Clang] update reasoned delete diagnostic kind to use Extension, making it pedantic only (PR #114713)

[Oleksandr T. via cfe-commits]

https://github.com/a-tarasyuk updated https://github.com/llvm/llvm-project/pull/114713

>From c07fa270194eadde3ccecab368b2225702fc2e63 Mon Sep 17 00:00:00 2001
From: Oleksandr T <oleksandr.tarasiuk at outlook.com>
Date: Sun, 3 Nov 2024 19:22:56 +0200
Subject: [PATCH 1/2] [Clang] update reasoned delete diagnostic kind to use
 Extension, making it pedantic only

---
 clang/docs/ReleaseNotes.rst                       |  2 ++
 clang/include/clang/Basic/DiagnosticParseKinds.td |  2 +-
 clang/test/Parser/cxx2c-delete-with-message.cpp   | 13 ++++++++++++-
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 1372e49dfac03c..3db2aa472902bc 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -464,6 +464,8 @@ Improvements to Clang's diagnostics
 
 - Clang now diagnoses ``[[deprecated]]`` attribute usage on local variables (#GH90073).
 
+- Clang now diagnoses misused reasoned ``delete("reason")`` warnings only in pedantic mode. (#GH109311).
+
 Improvements to Clang's time-trace
 ----------------------------------
 
diff --git a/clang/include/clang/Basic/DiagnosticParseKinds.td b/clang/include/clang/Basic/DiagnosticParseKinds.td
index 78510e61a639fa..6fbe874c5e6425 100644
--- a/clang/include/clang/Basic/DiagnosticParseKinds.td
+++ b/clang/include/clang/Basic/DiagnosticParseKinds.td
@@ -971,7 +971,7 @@ def warn_cxx98_compat_defaulted_deleted_function : Warning<
   "%select{defaulted|deleted}0 function definitions are incompatible with C++98">,
   InGroup<CXX98Compat>, DefaultIgnore;
 
-def ext_delete_with_message : ExtWarn<
+def ext_delete_with_message : Extension<
   "'= delete' with a message is a C++2c extension">, InGroup<CXX26>;
 def warn_cxx23_delete_with_message : Warning<
   "'= delete' with a message is incompatible with C++ standards before C++2c">,
diff --git a/clang/test/Parser/cxx2c-delete-with-message.cpp b/clang/test/Parser/cxx2c-delete-with-message.cpp
index 1767a080a7dcd8..5796c548632ae4 100644
--- a/clang/test/Parser/cxx2c-delete-with-message.cpp
+++ b/clang/test/Parser/cxx2c-delete-with-message.cpp
@@ -1,7 +1,17 @@
-// RUN: %clang_cc1 -std=c++23 -fsyntax-only -verify=expected,pre26 -pedantic %s
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify=expected -DTEST_NON_PEDANTIC %s
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify=expected,pre26 -pedantic %s
 // RUN: %clang_cc1 -std=c++2c -fsyntax-only -verify=expected,compat -Wpre-c++26-compat %s
 // RUN: %clang_cc1 -std=c++2c -fsyntax-only -verify %s
 
+#ifdef DTEST_NON_PEDANTIC
+namespace GH109311 {
+void f() = delete
+#if __cpp_deleted_function >= 202403L
+    ("reason") // ok
+#endif
+;
+}
+#else
 struct S {
   void a() = delete;
   void b() = delete(; // expected-error {{expected string literal}} expected-error {{expected ')'}} expected-note {{to match this '('}}
@@ -49,3 +59,4 @@ struct C {
   U f = delete ("hello"); // expected-error {{cannot delete expression of type 'const char[6]'}}
 };
 }
+#endif
\ No newline at end of file

>From ea607a92cec49141deb768d80fb890bea942c24f Mon Sep 17 00:00:00 2001
From: Oleksandr T <oleksandr.tarasiuk at outlook.com>
Date: Mon, 4 Nov 2024 19:27:58 +0200
Subject: [PATCH 2/2] update tests/release notes

---
 clang/docs/ReleaseNotes.rst                   |  2 +-
 .../test/Parser/cxx2c-delete-with-message.cpp | 45 +++++++++----------
 2 files changed, 23 insertions(+), 24 deletions(-)

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 3db2aa472902bc..4f5e4e647bd6e5 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -464,7 +464,7 @@ Improvements to Clang's diagnostics
 
 - Clang now diagnoses ``[[deprecated]]`` attribute usage on local variables (#GH90073).
 
-- Clang now diagnoses misused reasoned ``delete("reason")`` warnings only in pedantic mode. (#GH109311).
+- Clang now diagnoses ``= delete("reason")`` extension warnings only in pedantic mode rather than on by default. (#GH109311).
 
 Improvements to Clang's time-trace
 ----------------------------------
diff --git a/clang/test/Parser/cxx2c-delete-with-message.cpp b/clang/test/Parser/cxx2c-delete-with-message.cpp
index 5796c548632ae4..d2d5ccf4623c9c 100644
--- a/clang/test/Parser/cxx2c-delete-with-message.cpp
+++ b/clang/test/Parser/cxx2c-delete-with-message.cpp
@@ -1,31 +1,22 @@
-// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify=expected -DTEST_NON_PEDANTIC %s
-// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify=expected,pre26 -pedantic %s
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify=expected,pre26 %s
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify=expected,pre26-pedantic -pedantic %s
 // RUN: %clang_cc1 -std=c++2c -fsyntax-only -verify=expected,compat -Wpre-c++26-compat %s
 // RUN: %clang_cc1 -std=c++2c -fsyntax-only -verify %s
 
-#ifdef DTEST_NON_PEDANTIC
-namespace GH109311 {
-void f() = delete
-#if __cpp_deleted_function >= 202403L
-    ("reason") // ok
-#endif
-;
-}
-#else
 struct S {
   void a() = delete;
   void b() = delete(; // expected-error {{expected string literal}} expected-error {{expected ')'}} expected-note {{to match this '('}}
   void c() = delete(); // expected-error {{expected string literal}}
   void d() = delete(42); // expected-error {{expected string literal}}
-  void e() = delete("foo"[0]); // expected-error {{expected ')'}} expected-note {{to match this '('}} // pre26-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
-  void f() = delete("foo"); // pre26-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
-
-  S() = delete("foo"); // pre26-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
-  ~S() = delete("foo"); // pre26-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
-  S(const S&) = delete("foo"); // pre26-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
-  S(S&&) = delete("foo"); // pre26-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
-  S& operator=(const S&) = delete("foo"); // pre26-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
-  S& operator=(S&&) = delete("foo"); // pre26-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
+  void e() = delete("foo"[0]); // expected-error {{expected ')'}} expected-note {{to match this '('}} // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
+  void f() = delete("foo"); // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
+
+  S() = delete("foo"); // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
+  ~S() = delete("foo"); // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
+  S(const S&) = delete("foo"); // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
+  S(S&&) = delete("foo"); // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
+  S& operator=(const S&) = delete("foo"); // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
+  S& operator=(S&&) = delete("foo"); // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
 };
 
 struct T {
@@ -41,8 +32,8 @@ void a() = delete;
 void b() = delete(; // expected-error {{expected string literal}} expected-error {{expected ')'}} expected-note {{to match this '('}}
 void c() = delete(); // expected-error {{expected string literal}}
 void d() = delete(42); // expected-error {{expected string literal}}
-void e() = delete("foo"[0]); // expected-error {{expected ')'}} expected-note {{to match this '('}} // pre26-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
-void f() = delete("foo"); // pre26-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
+void e() = delete("foo"[0]); // expected-error {{expected ')'}} expected-note {{to match this '('}} // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
+void f() = delete("foo"); // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2c}}
 
 constexpr const char *getMsg() { return "this is a message"; }
 void func() = delete(getMsg()); // expected-error {{expected string literal}}
@@ -59,4 +50,12 @@ struct C {
   U f = delete ("hello"); // expected-error {{cannot delete expression of type 'const char[6]'}}
 };
 }
-#endif
\ No newline at end of file
+
+namespace GH109311 {
+void f() = delete
+#if __cpp_deleted_function >= 202403L
+    ("reason") // pre26-pedantic-warning {{'= delete' with a message is a C++2c extension}} \
+               // compat-warning {{'= delete' with a message is incompatible with C++ standards before C++2}}
+#endif
+;
+}