[clang] [C23] Implement N3018: The constexpr specifier for object definitions (PR #73099)

[Aaron Ballman via cfe-commits]

================
@@ -13823,7 +13869,9 @@ void Sema::AddInitializerToDecl(Decl *RealDecl, Expr 
*Init, bool DirectInit) {
       VDecl->setStorageClass(SC_Extern);
 
     // C99 6.7.8p4. All file scoped initializers need to be constant.
-    if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl())
+    // Avoid double diagnoses for constexpr variables.
----------------
AaronBallman wrote:

```suggestion
    // Avoid duplicate diagnostics for constexpr variables.
```

https://github.com/llvm/llvm-project/pull/73099
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