From 0217ed72f986d78b177f1a014e93f2150105bb44 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Sat, 20 Dec 2014 19:49:19 -0500
Subject: [PATCH] set optopt in getopt_long

this is undocumented but possibly expected behavior of GNU
getopt_long, and useful when error message printing has been
suppressed.
---
 src/misc/getopt_long.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/misc/getopt_long.c b/src/misc/getopt_long.c
index 45992f85..e5a4a75a 100644
--- a/src/misc/getopt_long.c
+++ b/src/misc/getopt_long.c
@@ -76,6 +76,7 @@ static int __getopt_long_core(int argc, char *const *argv, const char *optstring
 		if (cnt==1) {
 			i = match;
 			optind++;
+			optopt = longopts[i].val;
 			if (*opt == '=') {
 				if (!longopts[i].has_arg) {
 					if (optstring[0] == ':' || !opterr)
-- 
2.25.1