[clang] [clang] Fix crash when inheriting from a cv-qualified type (PR #70594)

[Rajveer Singh Bharadwaj via cfe-commits]

https://github.com/Rajveer100 updated https://github.com/llvm/llvm-project/pull/70594

>From a27a6858e44047bc0ff55485355932259e2f9358 Mon Sep 17 00:00:00 2001
From: Rajveer <rajveer.developer at icloud.com>
Date: Sun, 29 Oct 2023 18:37:17 +0530
Subject: [PATCH] [clang] Fix a crash in debug mode

Resolves Issue #35603

This bug was caused due to the assertions being too strict,
loosened by stripping qualifiers from the base class but not
from the type of the initializer.

Added Release Notes for the same.
---
 clang/docs/ReleaseNotes.rst    |  3 +++
 clang/lib/AST/ExprConstant.cpp |  2 +-
 clang/test/Sema/GH70594.cpp    | 19 +++++++++++++++++++
 3 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 clang/test/Sema/GH70594.cpp

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 649ad655905af23..5087ec04fc17ded 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -268,6 +268,9 @@ Bug Fixes to C++ Support
 - Clang no longer tries to call consteval constructors at runtime when they appear in a member initializer.
   (`#782154 <https://github.com/llvm/llvm-project/issues/82154>`_`)
 
+- Fix crash when inheriting from a cv-qualified type. Fixes:
+  (`#35603 <https://github.com/llvm/llvm-project/issues/35603>`_)
+
 Bug Fixes to AST Handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index fcf8f6591a79234..28709fb2556d3f7 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -6421,7 +6421,7 @@ static bool HandleConstructorCall(const Expr *E, const LValue &This,
       // Non-virtual base classes are initialized in the order in the class
       // definition. We have already checked for virtual base classes.
       assert(!BaseIt->isVirtual() && "virtual base for literal type");
-      assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) &&
+      assert(Info.Ctx.hasSameUnqualifiedType(BaseIt->getType(), BaseType) &&
              "base class initializers not in expected order");
       ++BaseIt;
 #endif
diff --git a/clang/test/Sema/GH70594.cpp b/clang/test/Sema/GH70594.cpp
new file mode 100644
index 000000000000000..853552108ec2b67
--- /dev/null
+++ b/clang/test/Sema/GH70594.cpp
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -verify
+// RUN: %clang_cc1 -fsyntax-only -std=c++23 %s -verify
+
+// expected-no-diagnostics
+
+struct A {};
+using CA = const A;
+
+struct S1 : CA {
+  constexpr S1() : CA() {}
+};
+
+struct S2 : A {
+  constexpr S2() : CA() {}
+};
+
+struct S3 : CA {
+  constexpr S3() : A() {}
+};