Index: include/clang/Frontend/PrecompiledPreamble.h
===================================================================
--- include/clang/Frontend/PrecompiledPreamble.h
+++ include/clang/Frontend/PrecompiledPreamble.h
@@ -260,6 +260,9 @@
   /// used instead, but having only this method allows a simpler API.
   virtual void HandleMacroDefined(const Token &MacroNameTok,
                                   const MacroDirective *MD);
+  /// Creates wrapper class for PPCallbacks so we can also process information
+  /// about includes that are inside of a preamble
+  virtual std::unique_ptr<PPCallbacks> createPPCallbacks();
 };
 
 enum class BuildPreambleError {
Index: lib/Frontend/PrecompiledPreamble.cpp
===================================================================
--- lib/Frontend/PrecompiledPreamble.cpp
+++ lib/Frontend/PrecompiledPreamble.cpp
@@ -351,6 +351,10 @@
   if (!Act->BeginSourceFile(*Clang.get(), Clang->getFrontendOpts().Inputs[0]))
     return BuildPreambleError::BeginSourceFileFailed;
 
+  std::unique_ptr<PPCallbacks> DelegatedPPCallbacks = Callbacks.createPPCallbacks();
+
+  if (DelegatedPPCallbacks)
+    Clang->getPreprocessor().addPPCallbacks(std::move(DelegatedPPCallbacks));
   Act->Execute();
 
   // Run the callbacks.
@@ -709,6 +713,7 @@
 void PreambleCallbacks::HandleTopLevelDecl(DeclGroupRef DG) {}
 void PreambleCallbacks::HandleMacroDefined(const Token &MacroNameTok,
                                            const MacroDirective *MD) {}
+std::unique_ptr<PPCallbacks> PreambleCallbacks::createPPCallbacks() {return nullptr;}
 
 std::error_code clang::make_error_code(BuildPreambleError Error) {
   return std::error_code(static_cast<int>(Error), BuildPreambleErrorCategory());