[clang] Add Clang attribute to ensure that fields are initialized explicitly (PR #102040)

[Erich Keane via cfe-commits]

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@@ -743,6 +743,14 @@ void InitListChecker::FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
         ILE->updateInit(SemaRef.Context, Init, Filler);
       return;
     }
+
+    if (!VerifyOnly && Field->hasAttr<ExplicitInitAttr>()) {
+      SemaRef.Diag(ILE->getExprLoc(), diag::warn_field_requires_explicit_init)
+          << false << Field;
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erichkeane wrote:

Same here.

https://github.com/llvm/llvm-project/pull/102040