From e6035c8f6c98cbdbd4305a3ab70fe1a4034325bd Mon Sep 17 00:00:00 2001
From: Magnus Jacobsson <magnus.jacobsson@berotec.se>
Date: Sat, 3 Oct 2020 16:04:22 +0200
Subject: [PATCH] Show usage and exit non-zero for unsupported option in sccmap

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

diff --git a/doc/libgraph/sccmap.c b/doc/libgraph/sccmap.c
index 6808462b6..0c37efc2e 100644
--- a/doc/libgraph/sccmap.c
+++ b/doc/libgraph/sccmap.c
@@ -313,9 +313,11 @@ static void scanArgs(int argc, char **argv)
 		case '?':
 			if (optopt == '?')
 				usage(0);
-			else
-				fprintf(stderr, "%s: option -%c unrecognized - ignored\n",
+			else {
+				fprintf(stderr, "%s: option -%c unrecognized\n",
 						CmdName, optopt);
+				usage(1);
+			}
 			break;
 		}
 	}
-- 
2.40.0