1 files changed, 11 insertions, 0 deletions
diff --git a/clang/lib/AST/DeclCXX.cpp b/clang/lib/AST/DeclCXX.cpp
index 76e1cf54960..22ec400571e 100644
--- a/clang/lib/AST/DeclCXX.cpp
+++ b/clang/lib/AST/DeclCXX.cpp
@@ -991,6 +991,17 @@ void CXXRecordDecl::addedMember(Decl *D) {
           setArgPassingRestrictions(RecordDecl::APK_CanNeverPassInRegs);
 
         Data.HasIrrelevantDestructor = false;
+
+        if (isUnion()) {
+          data().DefaultedCopyConstructorIsDeleted = true;
+          data().DefaultedMoveConstructorIsDeleted = true;
+          data().DefaultedMoveAssignmentIsDeleted = true;
+          data().DefaultedDestructorIsDeleted = true;
+          data().NeedOverloadResolutionForCopyConstructor = true;
+          data().NeedOverloadResolutionForMoveConstructor = true;
+          data().NeedOverloadResolutionForMoveAssignment = true;
+          data().NeedOverloadResolutionForDestructor = true;
+        }
       } else if (!Context.getLangOpts().ObjCAutoRefCount) {
         setHasObjectMember(true);
       }