From ade8c04d144a2955e52c777e961a26ffbbf42c25 Mon Sep 17 00:00:00 2001
From: Chris Packham <judge.packham@gmail.com>
Date: Wed, 29 Dec 2021 15:20:57 +1300
Subject: configure.ac: Check that patch supports --no-backup-if-mismatch

BSD patch does not support --no-backup-if-mismatch. When we detect patch
check that it supports the option we use.

Fixes: #1577

Signed-off-by: Chris Packham <judge.packham@gmail.com>

diff --git a/configure.ac b/configure.ac
index 8736fe1..312f5e5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -169,6 +169,12 @@ CTNG_CPU_COUNT
 
 CTNG_PATH_TOOL_REQ([PATCH], [gpatch patch], [patch])
 
+# Ensure the detected patch supports --no-backup-if-mismatch (BSD patch does not)
+AC_MSG_CHECKING([whether patch supports --no-backup-if-mismatch])
+AS_IF([$PATCH --no-backup-if-mismatch </dev/null >/dev/null 2>&1],
+      AC_MSG_RESULT([yes]),
+      AC_MSG_ERROR([$PATCH does not support --no-backup-if-mismatch]))
+
 # We need a bash that is >= 3.1
 CTNG_PROG_VERSION_REQ_STRICT([BASH_SHELL],
     [GNU bash >= 3.1],
-- 
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