Define Print_Canonical_Types for llvm 21 compatibility

Author: mcbarton

lib/CppInterOp/Compatibility.h

@@ -31,6 +31,12 @@ static inline char* GetEnv(const char* Var_Name) {
 #endif
 }
 
+#if CLANG_VERSION_MAJOR < 21
+#define Print_Canonical_Types PrintCanonicalTypes
+#else
+#define Print_Canonical_Types PrintAsCanonical
+#endif
+
 #if CLANG_VERSION_MAJOR < 21
 #define clang_LookupResult_Found clang::LookupResult::Found
 #define clang_LookupResult_Not_Found clang::LookupResult::NotFound

lib/CppInterOp/CppInterOp.cpp

@@ -2108,7 +2108,7 @@ static void GetDeclName(const clang::Decl* D, ASTContext& Context,
   PrintingPolicy Policy(Context.getPrintingPolicy());
   Policy.SuppressTagKeyword = true;
   Policy.SuppressUnwrittenScope = true;
-  Policy.PrintCanonicalTypes = true;
+  Policy.Print_Canonical_Types = true;
   if (const TypeDecl* TD = dyn_cast<TypeDecl>(D)) {
     // This is a class, struct, or union member.
     QualType QT;