From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 8 Jun 2005 20:22:39 +0000 (+0000)
Subject: (AT_INIT): Don't accept Solaris 9's diff -u, since it outputs chatter
X-Git-Tag: AUTOCONF-2.59c~342
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=7c4b2f464d3f64308dcb9cf2756aaa629fff726b;p=thirdparty%2Fautoconf.git

(AT_INIT): Don't accept Solaris 9's diff -u, since it outputs chatter
if the input files are the same.  Problem reported by Ralf Menzel.
---

diff --git a/lib/autotest/general.m4 b/lib/autotest/general.m4
index ec741ce0a..04306b9a8 100644
--- a/lib/autotest/general.m4
+++ b/lib/autotest/general.m4
@@ -610,7 +610,8 @@ else
 fi
 
 # Use `diff -u' when possible.
-if diff -u "$at_devnull" "$at_devnull" >/dev/null 2>&1; then
+if at_diff=`diff -u "$at_devnull" "$at_devnull" 2>&1` && test -z "$at_diff"
+then
   at_diff='diff -u'
 else
   at_diff=diff