From e27fe4b483194ee57736c228b7a6c56696ae8a06 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Hundeb=C3=B8ll?= <martin@geanix.com>
Date: Thu, 16 Mar 2023 09:29:20 +0100
Subject: [PATCH] archcommon: define GNU-only FNM_EXTMATCH to zero on non-glibc
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FNM_EXTMATCH is a GNU extension that enables extended pattern matching
for fnmatch(3). Defining it to zero on non-glibc builds makes ifupdown
usable, albeit with a sligthy reduced pattern matching feature set.

Signed-off-by: Martin Hundebøll <martin@geanix.com>
Upstream-status: Denied [https://salsa.debian.org/debian/ifupdown/-/merge_requests/5]
---
 archcommon.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/archcommon.h b/archcommon.h
index 818b0b6..981e84f 100644
--- a/archcommon.h
+++ b/archcommon.h
@@ -1,5 +1,15 @@
 #include "header.h"
 
+/*
+ * FNM_EXTMATCH is a GNU extension, so it isn't available when compiling
+ * with MUSL. Defining FNM_EXTMATCH to zero is safe, as the flag merely
+ * enables extended pattern matching, which MUSL users should be able to
+ * live without.
+ */
+#ifndef FNM_EXTMATCH
+#define FNM_EXTMATCH 0
+#endif
+
 bool execable(const char *);
 
 #define iface_is_link() (!_iface_has(ifd->real_iface, ":."))
-- 
2.39.2