1 files changed, 5 insertions, 0 deletions
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 5580f90b83b..6d51dbce3e2 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -4167,6 +4167,11 @@ void ASTWriter::MacroDefinitionRead(serialization::PreprocessedEntityID ID,
   MacroDefinitions[MD] = ID;
 }
 
+void ASTWriter::ModuleRead(serialization::SubmoduleID ID, Module *Mod) {
+  assert(SubmoduleIDs.find(Mod) == SubmoduleIDs.end());
+  SubmoduleIDs[Mod] = ID;
+}
+
 void ASTWriter::CompletedTagDefinition(const TagDecl *D) {
   assert(D->isCompleteDefinition());
   assert(!WritingAST && "Already writing the AST!");