================
@@ -450,6 +453,41 @@ class StmtComparer {
 };
 } // namespace
 
+static bool
+CheckStructurallyEquivalentAttributes(StructuralEquivalenceContext &Context,
+                                      const Decl *D1, const Decl *D2,
+                                      const Decl *PrimaryDecl = nullptr) {
+  // If either declaration has an attribute on it, we treat the declarations
+  // as not being structurally equivalent.
+  // FIXME: this should be handled on a case-by-case basis via tablegen in
+  // Attr.td. There are multiple cases to consider: one declation with the
+  // attribute, another without it; different attribute syntax|spellings for
+  // the same semantic attribute, differences in attribute arguments, order
+  // in which attributes are applied, how to merge attributes if the types are
+  // structurally equivalent, etc.
+  const Attr *D1Attr = nullptr, *D2Attr = nullptr;
----------------
AaronBallman wrote:

Yeah, I think we should just hold off until we're ready to bite the bullet and 
do it properly.

https://github.com/llvm/llvm-project/pull/132939
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