1 files changed, 14 insertions, 0 deletions
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 0f50d7a42ea..e36e9185170 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -4611,6 +4611,11 @@ void ASTWriter::WriteDeclUpdatesBlocks(RecordDataImpl &OffsetsRecord) {
         AddSourceLocation(Update.getLoc(), Record);
         break;
 
+      case UPD_CXX_INSTANTIATED_DEFAULT_ARGUMENT:
+        AddStmt(const_cast<Expr*>(
+                  cast<ParmVarDecl>(Update.getDecl())->getDefaultArg()));
+        break;
+
       case UPD_CXX_INSTANTIATED_CLASS_DEFINITION: {
         auto *RD = cast<CXXRecordDecl>(D);
         UpdatedDeclContexts.insert(RD->getPrimaryContext());
@@ -5779,6 +5784,15 @@ void ASTWriter::StaticDataMemberInstantiated(const VarDecl *D) {
        D->getMemberSpecializationInfo()->getPointOfInstantiation()));
 }
 
+void ASTWriter::DefaultArgumentInstantiated(const ParmVarDecl *D) {
+  assert(!WritingAST && "Already writing the AST!");
+  if (!D->isFromASTFile())
+    return;
+
+  DeclUpdates[D].push_back(
+      DeclUpdate(UPD_CXX_INSTANTIATED_DEFAULT_ARGUMENT, D));
+}
+
 void ASTWriter::AddedObjCCategoryToInterface(const ObjCCategoryDecl *CatD,
                                              const ObjCInterfaceDecl *IFD) {
   assert(!WritingAST && "Already writing the AST!");