diff --git a/clang/include/clang/Tooling/DependencyScanning/ModuleDepCollector.h b/clang/include/clang/Tooling/DependencyScanning/ModuleDepCollector.h
index 325f15fef0174..8a6b9c6755deb 100644
--- a/clang/include/clang/Tooling/DependencyScanning/ModuleDepCollector.h
+++ b/clang/include/clang/Tooling/DependencyScanning/ModuleDepCollector.h
@@ -183,6 +183,11 @@ struct ModuleDeps {
   /// module. Does not include argv[0].
   const std::vector<std::string> &getBuildArguments() const;
 
+  /// Experimental: get a copy of the underlying CompilerInvocation before
+  /// calling `getBuildArguments`. This provides a short cut to inspect/modify
+  /// the compiler invocation state.
+  CowCompilerInvocation getUnderlyingCompilerInvocation() const;
+
 private:
   friend class ModuleDepCollector;
   friend class ModuleDepCollectorPP;
diff --git a/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp b/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
index 6c40708c0ad16..c4ef2d2ed637b 100644
--- a/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
+++ b/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
@@ -46,6 +46,13 @@ const std::vector<std::string> &ModuleDeps::getBuildArguments() const {
   return std::get<std::vector<std::string>>(BuildInfo);
 }
 
+
+CowCompilerInvocation ModuleDeps::getUnderlyingCompilerInvocation() const {
+  assert(std::holds_alternative<CowCompilerInvocation>(BuildInfo) &&
+         "ModuleDeps doesn't hold compiler invocation");
+  return *std::get_if<CowCompilerInvocation>(&BuildInfo);
+}
+
 static void
 optimizeHeaderSearchOpts(HeaderSearchOptions &Opts, ASTReader &Reader,
                          const serialization::ModuleFile &MF,