From 1fdfe2314ce69dda30b7e89b4788f4563725de0a Mon Sep 17 00:00:00 2001
From: Magnus Jacobsson <magnus.jacobsson@berotec.se>
Date: Sat, 3 Oct 2020 16:03:13 +0200
Subject: [PATCH] Show usage and exit non-zero for unsupported option in smyrna

Towards https://gitlab.com/graphviz/graphviz/-/issues/1843.
---
 cmd/smyrna/main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/cmd/smyrna/main.c b/cmd/smyrna/main.c
index 13d952887..1a34b0f52 100644
--- a/cmd/smyrna/main.c
+++ b/cmd/smyrna/main.c
@@ -136,10 +136,12 @@ static char *parseArgs(int argc, char *argv[], ViewInfo * view)
 	case '?':
 	    if (optopt == '\0')
 		usage(0);
-	    else
+	    else {
 		fprintf(stderr,
-			"smyrna: option -%c unrecognized - ignored\n",
+			"smyrna: option -%c unrecognized\n",
 			optopt);
+		usage(1);
+	    }
 	    break;
 	}
     }
-- 
2.40.0