Index: lib/Sema/SemaChecking.cpp
===================================================================
--- lib/Sema/SemaChecking.cpp
+++ lib/Sema/SemaChecking.cpp
@@ -10889,7 +10889,7 @@
         if (S.SourceMgr.isInSystemMacro(CC))
           return;
 
-        DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_double_promotion);
+        DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_double_promotion, true);
       }
       return;
     }