jansvoboda11 added a comment.

I finished an initial pass through the code and it looks good for the most 
parts. I left a couple of suggestions in-line.
Did you test this change on some larger body of code? That would make me more 
confident, since this is a non-trivial change.

Might be good to get other reviewers to chime in.



================
Comment at: clang/include/clang/Lex/PreprocessorOptions.h:214
+      FileEntryRef)>
+      DependencyDirectivesForFile;
 
----------------
To be honest, I'm not a fan of using `PreprocessorOptions` to carry state 
between compiler invocations.

Could we implement a different mechanism for this in a prep patch an put 
`DependencyDirectivesForFile` there? `FailedModules` also seem as a state 
rather than options.


================
Comment at: clang/lib/Lex/DependencyDirectivesSourceMinimizer.cpp:1
-//===- DependencyDirectivesSourceMinimizer.cpp -  
-------------------------===//
-//
----------------
Can you split out the minimizer -> directives scanner rename into a separate 
patch? That would help with reviewing.


================
Comment at: 
clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp:204
 
-      // Pass the skip mappings which should speed up excluded conditional 
block
-      // skipping in the preprocessor.
-      ScanInstance.getPreprocessorOpts()
-          .ExcludedConditionalDirectiveSkipMappings = &PPSkipMappings;
+      llvm::IntrusiveRefCntPtr<DependencyScanningWorkerFilesystem> localDepFS =
+          DepFS;
----------------
Nit: I think Clang still uses `PascalCase` for variable names.


================
Comment at: clang/test/ClangScanDeps/macro-expansions.cpp:1
+// RUN: rm -rf %t
+// RUN: split-file %s %t
----------------
Could you provide a short description of what's the intention of this test? 
Probably not obvious to the uninitiated.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D124687/new/

https://reviews.llvm.org/D124687

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