cppopts.texi (-dU): Document.

[gcc.git] / gcc / c-opts.c

diff --git a/gcc/c-opts.c b/gcc/c-opts.c
index 69c4d5448853c245cbf00d01d1436c22b77c94ac..1413b7f8036bf5b271d9ea109b0f9178a448d68e 100644 (file)
--- a/gcc/c-opts.c
+++ b/gcc/c-opts.c
@@ -1668,6 +1668,7 @@ handle_OPT_d (const char *arg)
       case 'M':                        /* Dump macros only.  */
       case 'N':                        /* Dump names.  */
       case 'D':                        /* Dump definitions.  */
+      case 'U':                        /* Dump used macros.  */
        flag_dump_macros = c;
        break;