================
@@ -739,6 +748,12 @@ ModuleDepCollectorPP::handleTopLevelModule(const Module 
*M) {
   MDC.ScanInstance.getASTReader()->visitInputFileInfos(
       *MF, /*IncludeSystem=*/true,
       [&](const serialization::InputFileInfo &IFI, bool IsSystem) {
+        if (MD.IsInSysroot) {
+          auto FullFilePath = ASTReader::ResolveImportedPath(
+              PathBuf, IFI.UnresolvedImportedFilename, MF->BaseDirectory);
+          MD.IsInSysroot = FullFilePath->starts_with(CurrSysroot);
----------------
cyndyishida wrote:

There's also a swift version that attempts to do the same. 
https://github.com/swiftlang/swift/blob/b4a2908fb5d7ae5b19d1f4a7f0ec9636f7c729c9/lib/Basic/StringExtras.cpp#L1459
It isolates & moves forward by separator, so I can try to apply this here (and 
double check it resolves the examples you point out).

https://github.com/llvm/llvm-project/pull/130634
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