================
@@ -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);
----------------
benlangmuir wrote:

Minor nit: string prefix is not correct for paths, it also needs to check that 
the next character in `FullFilePath` is a separator.  I'm surprised I can't 
find an existing utility for this in Path.h, but maybe we should add one.

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