From a6b1c8dbda1877557fbea634eed0b934372e6c08 Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Sun, 10 Mar 2019 09:23:33 +0000
Subject: Automatically detect whether diff(1) supports the -a option. Useful
 on illumos and on Oracle Solaris, where it doesn't. Patch written based on a
 report from Sevan Janiyan.

---
 regress/regress.pl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/regress/regress.pl b/regress/regress.pl
index 9d8fcf58..7faa3a5f 100755
--- a/regress/regress.pl
+++ b/regress/regress.pl
@@ -1,6 +1,6 @@
 #!/usr/bin/env perl
 #
-# $Id: regress.pl,v 1.9 2018/12/16 00:17:04 schwarze Exp $
+# $Id: regress.pl,v 1.10 2019/03/10 09:23:33 schwarze Exp $
 #
 # Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
 #
@@ -27,6 +27,7 @@ use IPC::Open3 qw(open3);
 # Define this at one place such that it can easily be changed
 # if diff(1) does not support the -a option.
 my @diff = qw(diff -au);
+system @diff, '/dev/null', '/dev/null' and @diff = qw(diff -u);
 
 # --- utility functions ------------------------------------------------
 
-- 
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