Fix: raised error on tool/ifchange.

* tool/ifchange: Fix: arguments which begin with minus sign may
  parsed as options.  Because of older systems, don't use --
  but use parentheses.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@23347 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Tue May  5 11:29:07 2009  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* tool/ifchange: Fix: arguments which begin with minus sign may
+	  parsed as options.  Because of older systems, don't use --
+	  but use parentheses.
+
 Tue May  5 10:42:28 2009  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* ext/json: Update to JSON 1.1.4.

tool/ifchange

@@ -8,7 +8,7 @@ until [ "$0" = 0 ]; do
 	    timestamp=.
 	    ;;
 	--timestamp=*)
-	    timestamp=`expr "$1" : '[^=]*=\(.*\)'`
+	    timestamp=`expr \( "$1" : '[^=]*=\(.*\)' \)`
 	    ;;
 	*)
 	    break