[clang] [Clang][Sema] Diagnosis for constexpr constructor not initializing a union member (PR #81225)

[via cfe-commits]

================
@@ -2393,6 +2391,17 @@ static bool CheckConstexprFunctionBody(Sema &SemaRef, 
const FunctionDecl *Dcl,
                                              Kind))
             return false;
       }
+    } else if (!Constructor->isDelegatingConstructor()) {
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mahtohappy wrote:

Hi, the check before here in the file only checks for non-templated, 
non-delegating constructors initializing the class  where union is member, and 
that produces a different warning. 
And if you're why this whole patch, then I've added the issue it resolves.  


https://github.com/llvm/llvm-project/pull/81225
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