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

1 files changed, 1 insertions, 1 deletions

diff --git a/tool/ifchange b/tool/ifchange
index 7038615d43..177ce7340b 100755
--- a/tool/ifchange
+++ b/tool/ifchange
@@ -8,7 +8,7 @@ until [ "$0" = 0 ]; do
 	    timestamp=.
 	    ;;
 	--timestamp=*)
-	    timestamp=`expr "$1" : '[^=]*=\(.*\)'`
+	    timestamp=`expr \( "$1" : '[^=]*=\(.*\)' \)`
 	    ;;
 	*)
 	    break