================
@@ -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) {
----------------
divVerent wrote:
Ah, good - if they don't propagate macros, they indeed also shouldn't propagate
`redefine_extname` (or `#pragma once` state). And then we have no problem here
either, because if both don't get propagated, everything is fine.
However, it seems like header _units_ do propagate macros, so we need this for
them as well.
How do I distinguish the three in Clang code, so this is only skipped for
header _modules_?
https://github.com/llvm/llvm-project/pull/186755
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