Index: lib/Sema/SemaDeclCXX.cpp
===================================================================
--- lib/Sema/SemaDeclCXX.cpp
+++ lib/Sema/SemaDeclCXX.cpp
@@ -13870,6 +13870,11 @@
   if (Fn->isMain())
     Diag(DelLoc, diag::err_deleted_main);
 
+  // C++11 [dcl.fct.def.delete]p4:
+  //  A deleted function is implicitly inline.
+  // NOTE: Modules cannot correctly merge deleted functions unless they are
+  // inline.
+  Fn->setImplicitlyInline();
   Fn->setDeletedAsWritten();
 }