Revert "[clang] trigger -Wcast-qual on functional casts"

This reverts commit 7c00219. It broke post-commit buildbots: https://lab.llvm.org/buildbot/#/builders/37/builds/21631
llvm · Apr 21, 2023 · 7f00ecd · 7f00ecd
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diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
@@ -231,8 +231,6 @@ Improvements to Clang's diagnostics
 - ``-Wformat`` now recognizes ``%lb`` for the ``printf``/``scanf`` family of
   functions.
   (`#62247: <https://github.com/llvm/llvm-project/issues/62247>`_).
-- ``-Wcast-qual`` now triggers on function-style casts.
-  (`#62083 <https://github.com/llvm/llvm-project/issues/62083>`_)
 
 Bug Fixes in This Version
 -------------------------

diff --git a/clang/lib/Sema/SemaCast.cpp b/clang/lib/Sema/SemaCast.cpp
@@ -3332,9 +3332,6 @@ ExprResult Sema::BuildCXXFunctionalCastExpr(TypeSourceInfo *CastTypeInfo,
   if (auto *ConstructExpr = dyn_cast<CXXConstructExpr>(SubExpr))
     ConstructExpr->setParenOrBraceRange(SourceRange(LPLoc, RPLoc));
 
-  // -Wcast-qual
-  DiagnoseCastQual(Op.Self, Op.SrcExpr, Op.DestType);
-
   return Op.complete(CXXFunctionalCastExpr::Create(
       Context, Op.ResultType, Op.ValueKind, CastTypeInfo, Op.Kind,
       Op.SrcExpr.get(), &Op.BasePath, CurFPFeatureOverrides(), LPLoc, RPLoc));

diff --git a/clang/test/SemaCXX/warn-cast-qual.cpp b/clang/test/SemaCXX/warn-cast-qual.cpp
@@ -34,17 +34,6 @@ void foo_0() {
   const int &a6 = (int &)((int &)a);       // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
   const int &a7 = (int &)((const int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
   const int &a8 = (const int &)((int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
-
-  using T = int&;
-  using T2 = const int&;
-  const int &a11 =T2(a);      // no warning
-  int a22 = T(a);             // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
-  const int &a33 = T(a);      // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
-  int &a44 = T(T2(a));        // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
-  int &a55 = T(T(a));         // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
-  const int &a66 = T(T(a));   // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
-  int &a77 = T(T2(a));        // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
-  const int &a88 = T2(T(a));  // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
 }
 
 void foo_1() {
@@ -60,17 +49,6 @@ void foo_1() {
   volatile int &a6 = (int &)((int &)a);          // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
   volatile int &a7 = (int &)((volatile int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
   volatile int &a8 = (volatile int &)((int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
-
-  using T = int&;
-  using T2 = volatile int&;
-  volatile int &a11 =T2(a);     // no warning
-  int a22 = T(a);               // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
-  volatile int &a33 = T(a);     // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
-  int &a44 = T(T2(a));          // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
-  int &a55 = T(T(a));           // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
-  volatile int &a66 = T(T(a));  // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
-  int &a77 = T(T2(a));          // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
-  volatile int &a88 = T2(T(a)); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
 }
 
 void foo_2() {
@@ -86,17 +64,6 @@ void foo_2() {
   const volatile int &a6 = (int &)((int &)a);                // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
   const volatile int &a7 = (int &)((const volatile int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
   const volatile int &a8 = (const volatile int &)((int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
-
-  using T = int&;
-  using T2 = const volatile int&;
-  const volatile int &a11 =T2(a);           // no warning
-  int a22 = T(a);                     // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
-  const volatile int &a33 = T(a);     // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
-  int &a44 = T(T2(a));                // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
-  int &a55 = T(T(a));                 // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
-  const volatile int &a66 = T(T(a));  // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
-  const volatile int &a77 = T(T2(a)); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
-  const volatile int &a88 = T2(T(a)); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
 }
 
 void bar_0() {
@@ -111,16 +78,6 @@ void bar_0() {
 
   const int **a4 = (const int **)((int **)a);        // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} expected-warning {{cast from 'int **' to 'const int **' must have all intermediate pointers const qualified to be safe}}
   const int **a5 = (const int **)((const int **)a); // no warning
-
-  using T = int**;
-  using T2 = const int**;
-
-  int **a00 = T(T2(a)) ;          // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
-  int **a11 = T(T(a));            // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
-
-  const int **a44 = T2(T(a));     // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} expected-warning {{cast from 'T' (aka 'int **') to 'T2' (aka 'const int **') must have all intermediate pointers const qualified to be safe}}
-  const int **a55 = T2(T2(a));    // no warning
-
 }
 
 void bar_1() {
@@ -135,15 +92,6 @@ void bar_1() {
 
   const int *&a4 = (const int *&)((int *&)a);        // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} expected-warning {{cast from 'int *' to 'const int *&' must have all intermediate pointers const qualified to be safe}}
   const int *&a5 = (const int *&)((const int *&)a); // no warning
-
-  using T = int*&;
-  using T2 = const int*&;
-
-  int *&a00 = T(T2(a));           // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
-  int *&a11 = T(T(a));            // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
-
-  const int *&a44 = T2(T(a));     // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} expected-warning {{cast from 'int *' to 'T2' (aka 'const int *&') must have all intermediate pointers const qualified to be safe}}
-  const int *&a55 = T2(T2(a));    // no warning
 }
 
 void baz_0() {
@@ -160,14 +108,6 @@ void baz_0() {
 
   ((C *)&S)->B(); // expected-warning {{cast from 'const C *' to 'C *' drops const qualifier}}
   ((C *)&S)->A(); // expected-warning {{cast from 'const C *' to 'C *' drops const qualifier}}
-
-  using T = C&;
-  using T2 = C*;
-  T(S).B(); // expected-warning {{cast from 'const C' to 'C &' drops const qualifier}}
-  T(S).A(); // expected-warning {{cast from 'const C' to 'C &' drops const qualifier}}
-
-  T2(&S)->B(); // expected-warning {{cast from 'const C *' to 'C *' drops const qualifier}}
-  T2(&S)->A(); // expected-warning {{cast from 'const C *' to 'C *' drops const qualifier}}
 }
 
 void baz_1() {
@@ -187,14 +127,6 @@ void baz_1() {
 
     *(int *)(&S.a) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
     *(int *)(&S.b) = 0; // no warning
-
-    using T = int&;
-    using T2 = int*;
-    T(S.a) = 0; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
-    T(S.b) = 0; // no warning
-
-    *T2(&S.a) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
-    *T2(&S.b) = 0; // no warning
   }
   {
     const C S;
@@ -204,39 +136,5 @@ void baz_1() {
 
     *(int *)(&S.a) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
     *(int *)(&S.b) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
-
-    using T = int&;
-    using T2 = int*;
-    T(S.a) = 0; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
-    T(S.b) = 0; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
-
-    *T2(&S.a) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
-    *T2(&S.b) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
   }
 }
-
-void qux_0() {
-  const auto i = 42;
-  using T = int*;
-  auto p = T(&i); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
-
-  const auto i2 = 42;
-  using T2 = const int*;
-  auto p2 = T2(&i2);
-
-  volatile auto i3 = 42;
-  using T3= int*;
-  auto p3 = T3(&i3); // expected-warning {{cast from 'volatile int *' to 'int *' drops volatile qualifier}}
-
-  volatile auto i4 = 42;
-  using T4 = volatile int*;
-  auto p4 = T4(&i4);
-
-  const volatile auto i5 = 42;
-  using T5= int*;
-  auto p5 = T5(&i5);  // expected-warning {{cast from 'const volatile int *' to 'int *' drops const and volatile qualifiers}}
-
-  const volatile auto i6 = 42;
-  using T6= const volatile int*;
-  auto p6 = T6(&i6);
-}