================
@@ -34,12 +34,17 @@ class InitOnlyAction : public FrontendAction {
 
 /// Preprocessor-based frontend action that also loads PCH files.
 class ReadPCHAndPreprocessAction : public FrontendAction {
+  llvm::function_ref<void(CompilerInstance &)> OnCI;
----------------
jansvoboda11 wrote:

`function_ref` is safe here because `ReadPCHAndPreprocessAction ` is a stack 
variable in `DependencyScanningAction::runInvocation()` where it's clear the 
callback live long enough. I don't mind being on the safe side and turning this 
into `std::function` if you'd prefer.

https://github.com/llvm/llvm-project/pull/86358
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