From: Magnus Jacobsson <Magnus.Jacobsson@berotec.se>
Date: Tue, 20 Oct 2020 06:30:44 +0000 (+0200)
Subject: Fix gc -? to actually print usage instead of error on macOS
X-Git-Tag: 2.46.0~20^2^2~15^2~15
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=2e167b180696a489912f3c460a649b26a9c63e26;p=graphviz

Fix gc -? to actually print usage instead of error on macOS

Towards https://gitlab.com/graphviz/graphviz/-/issues/1852.
---

diff --git a/cmd/tools/gc.c b/cmd/tools/gc.c
index cafe39d3f..70e2bd78a 100644
--- a/cmd/tools/gc.c
+++ b/cmd/tools/gc.c
@@ -123,7 +123,7 @@ static void init(int argc, char *argv[])
 	    gtype = UNDIRECTED;
 	    break;
 	case '?':
-	    if (optopt == '\0')
+	    if (optopt == '\0' || optopt == '?')
 		usage(0);
 	    else {
 		fprintf(stderr, "gc: option -%c unrecognized\n",