From: Magnus Jacobsson <Magnus.Jacobsson@berotec.se>
Date: Tue, 20 Oct 2020 06:31:38 +0000 (+0200)
Subject: Fix gvpack -? to actually print usage instead of error on macOS
X-Git-Tag: 2.46.0~20^2^2~15^2~13
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=1cb1a9957a378d88bf54e4579920d5df68937bce;p=graphviz

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

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

diff --git a/cmd/tools/gvpack.c b/cmd/tools/gvpack.c
index 721625f38..42f25eae2 100644
--- a/cmd/tools/gvpack.c
+++ b/cmd/tools/gvpack.c
@@ -243,7 +243,7 @@ static void init(int argc, char *argv[], pack_info* pinfo)
 	    fprintf(stderr, "gvpack: option -%c missing argument - ignored\n", optopt);
 	    break;
 	case '?':
-	    if (optopt == '\0')
+	    if (optopt == '\0' || optopt == '?')
 		usage(0);
 	    else {
 		fprintf(stderr,