From 3c1e89b0f29e5f95bb313ffd914e9ae113e33ea8 Mon Sep 17 00:00:00 2001
From: Allan Shortlidge <shortlidge@apple.com>
Date: Wed, 30 Jul 2025 12:56:55 -0700
Subject: [PATCH] Suppress warnings for Swift C++ interop by hiding operator
 declarations.

Addresses warnings like this that are emitted during the Swift compiler build:

```
include/llvm/Transforms/Scalar/GVN.h:268:12: warning: cycle detected while resolving 'leader_iterator' in swift_name attribute for 'operator==' [#ClangDeclarationImport]
```
---
 llvm/include/llvm/MC/MCRegisterInfo.h     | 2 ++
 llvm/include/llvm/TextAPI/Record.h        | 2 ++
 llvm/include/llvm/Transforms/Scalar/GVN.h | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/llvm/include/llvm/MC/MCRegisterInfo.h b/llvm/include/llvm/MC/MCRegisterInfo.h
index 11205a5a44c86..68ce575a36cbf 100644
--- a/llvm/include/llvm/MC/MCRegisterInfo.h
+++ b/llvm/include/llvm/MC/MCRegisterInfo.h
@@ -227,9 +227,11 @@ class MCRegisterInfo {
       return *this;
     }
 
+#ifndef __swift__
     bool operator==(const DiffListIterator &Other) const {
       return List == Other.List;
     }
+#endif
   };
 
 public:
diff --git a/llvm/include/llvm/TextAPI/Record.h b/llvm/include/llvm/TextAPI/Record.h
index 7d721988ec3da..07498208402f0 100644
--- a/llvm/include/llvm/TextAPI/Record.h
+++ b/llvm/include/llvm/TextAPI/Record.h
@@ -219,11 +219,13 @@ class ObjCInterfaceRecord : public ObjCContainerRecord {
     RecordLinkage Class = RecordLinkage::Unknown;
     RecordLinkage MetaClass = RecordLinkage::Unknown;
     RecordLinkage EHType = RecordLinkage::Unknown;
+#ifndef __swift__
     bool operator==(const Linkages &other) const {
       return std::tie(Class, MetaClass, EHType) ==
              std::tie(other.Class, other.MetaClass, other.EHType);
     }
     bool operator!=(const Linkages &other) const { return !(*this == other); }
+#endif
   };
   Linkages Linkages;
 
diff --git a/llvm/include/llvm/Transforms/Scalar/GVN.h b/llvm/include/llvm/Transforms/Scalar/GVN.h
index 61eb40aaa563c..571e1e0cea580 100644
--- a/llvm/include/llvm/Transforms/Scalar/GVN.h
+++ b/llvm/include/llvm/Transforms/Scalar/GVN.h
@@ -265,12 +265,14 @@ class GVNPass : public PassInfoMixin<GVNPass> {
         Current = Current->Next;
         return *this;
       }
+#ifndef __swift__
       bool operator==(const leader_iterator &Other) const {
         return Current == Other.Current;
       }
       bool operator!=(const leader_iterator &Other) const {
         return Current != Other.Current;
       }
+#endif
       reference operator*() const { return Current->Entry; }
     };