cast to char * when assigning to optarg

gas/ChangeLog:

2016-03-31  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>

	* as.c (parse_args): Cast literal to char * when assigning to optarg.

1 files changed, 1 insertions, 1 deletions

diff --git a/gas/as.c b/gas/as.c
index ad3d3a6391..cf8e90d743 100644
--- a/gas/as.c
+++ b/gas/as.c
@@ -621,7 +621,7 @@ parse_args (int * pargc, char *** pargv)
 
 	case 1:			/* File name.  */
 	  if (!strcmp (optarg, "-"))
-	    optarg = "";
+	    optarg = (char *) "";
 	  new_argv[new_argc++] = optarg;
 	  new_argv[new_argc] = NULL;
 	  break;