diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index e896b11..7fb2402 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -420,6 +420,10 @@
   /// \brief The complete set of modules that has been imported.
   llvm::SetVector<clang::Module *> ImportedModules;
 
+  /// \brief The set of modules for which the module initializers
+  /// have been emitted.
+  llvm::SmallPtrSet<clang::Module *, 16> EmittedModuleInitializers;
+
   /// \brief A vector of metadata strings.
   SmallVector<llvm::Metadata *, 16> LinkerOptionsMetadata;