[clang] [clang] Fix clang++ crash on assertions when compiling source (PR #70594)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Rajveer Singh Bharadwaj (Rajveer100)

<details>
<summary>Changes</summary>

Resolves Issue #<!-- -->35603

This change makes the `assertion` less strict in `debug` builds by stripping qualifiers from the base class and ignoring them. I hope `weakened` assertions don't affect other cases where such `errors` are intended to be `caught` by the compiler. 

---
Full diff: https://github.com/llvm/llvm-project/pull/70594.diff


2 Files Affected:

- (modified) clang/lib/AST/ExprConstant.cpp (+1-1) 
- (added) clang/test/Sema/assertion-crash.cpp (+19) 


``````````diff
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 5947805f9576ff8..07f0a12385b46e9 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -6431,7 +6431,7 @@ 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/assertion-crash.cpp b/clang/test/Sema/assertion-crash.cpp
new file mode 100644
index 000000000000000..853552108ec2b67
--- /dev/null
+++ b/clang/test/Sema/assertion-crash.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() {}
+};

``````````

</details>


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