From: Bruno Haible <bruno@clisp.org>
Date: Fri, 2 Sep 2011 08:51:52 +0000 (+0200)
Subject: tests: init.sh: work also with any non-GNU diff that supports -u
X-Git-Tag: v8.13~6
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0cefe580926e17c8781e8140bd9912795b6e21cc;p=thirdparty%2Fcoreutils.git

tests: init.sh: work also with any non-GNU diff that supports -u

* tests/init.sh: Relax check for diff -u support.
Rather than checking for GNU diff via --version, simply check
for support for -u itself.  Useful at least on OpenBSD 4.9.
---

diff --git a/tests/init.sh b/tests/init.sh
index 460937de4f..12b3ca37e1 100644
--- a/tests/init.sh
+++ b/tests/init.sh
@@ -221,7 +221,7 @@ export MALLOC_PERTURB_
 # a partition, or to undo any other global state changes.
 cleanup_ () { :; }
 
-if ( diff --version < /dev/null 2>&1 | grep GNU ) > /dev/null 2>&1; then
+if ( diff -u "$0" "$0" < /dev/null ) > /dev/null 2>&1; then
   compare () { diff -u "$@"; }
 elif ( cmp --version < /dev/null 2>&1 | grep GNU ) > /dev/null 2>&1; then
   compare () { cmp -s "$@"; }