================
@@ -6061,6 +6059,22 @@ ASTFileSignature ASTWriter::WriteASTCore(Sema *SemaPtr, 
StringRef isysroot,
     }
   }
 
+  // Write the set of #pragma redefine_extname'd, undeclared identifiers. We
+  // always write the entire table, since later PCH files in a PCH chain are
+  // only interested in the results at the end of the chain.
+  RecordData ExtnameUndeclaredIdentifiers;
+  if (SemaPtr) {
----------------
ChuanqiXu9 wrote:

But generally we won't propagate preprocessor detectives. I do feel this is not 
good to leak it. This is inconsistent the  design of named modules for 
isolation. 

https://github.com/llvm/llvm-project/pull/186755
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