1 files changed, 1 insertions, 0 deletions
diff --git a/gcc/toplev.c b/gcc/toplev.c
index 36b24d7eabf..b4b628d210c 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -1067,6 +1067,7 @@ decode_d_option (const char *arg)
       case 'I':
       case 'M':
       case 'N':
+      case 'U':
 	break;
       case 'H':
 	setup_core_dumping();