From 5712785e38665f9c4a73cff482d56b1829e93e68 Mon Sep 17 00:00:00 2001
From: Magnus Jacobsson <magnus.jacobsson@berotec.se>
Date: Sat, 3 Oct 2020 15:59:40 +0200
Subject: [PATCH] Show usage and exit non-zero for unsupported option in gvedit

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

diff --git a/cmd/gvedit/main.cpp b/cmd/gvedit/main.cpp
index 0901e5e3a..b10624ab4 100644
--- a/cmd/gvedit/main.cpp
+++ b/cmd/gvedit/main.cpp
@@ -68,9 +68,11 @@ static char **parseArgs(int argc, char *argv[])
 	case '?':
 	    if (optopt == '\0')
 		usage(0);
-	    else
+	    else {
 		errout << cmd << " : option -" << ((char) optopt) <<
-		    " unrecognized - ignored\n" << flush;
+		    " unrecognized\n" << flush;
+		usage(1);
+	    }
 	    break;
 	}
     }
-- 
2.40.0