================
@@ -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:
Do we need to write this unconditionally? At least I think we don't need it for
C++20 modules.
https://github.com/llvm/llvm-project/pull/186755
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