1 files changed, 7 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 4fb7cb8f1dd..19c0f2a9390 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -7379,6 +7379,13 @@ Sema::ActOnExplicitInstantiation(Scope *S,
         A->setInherited(true);
         Def->addAttr(A);
         checkClassLevelDLLAttribute(Def);
+
+        // Propagate attribute to base class templates.
+        for (auto &B : Def->bases()) {
+          if (auto *BT = dyn_cast_or_null<ClassTemplateSpecializationDecl>(
+                  B.getType()->getAsCXXRecordDecl()))
+            propagateDLLAttrToBaseClassTemplate(Def, A, BT, B.getLocStart());
+        }
       }
     }