# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1314965639 -7200
# Node ID 045f9cdabfe3f60fc7b9d626b7d78680137cb205
# Parent  a52b485186f60759a11bb765beb106b23167393b
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,
AIX 7.1, IRIX 6.5 and Solaris 10.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2011-09-02  Bruno Haible  <bruno@clisp.org>
+
+	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,
+	AIX 7.1, IRIX 6.5 and Solaris 10.
+
 2011-09-01  Bruno Haible  <bruno@clisp.org>
 
 	strtoimax, strtoumax: Document problem on HP-UX 11.
diff --git a/tests/init.sh b/tests/init.sh
--- a/tests/init.sh
+++ b/tests/init.sh
@@ -208,7 +208,7 @@
 # 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 "$@"; }