make-snapshot: suppress warnings

* tool/make-snapshot: suppress warnings for uninitialized global
  variables.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48836 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 5 insertions, 3 deletions

diff --git a/tool/make-snapshot b/tool/make-snapshot
index 96d836c981..c451d7eba4 100755
--- a/tool/make-snapshot
+++ b/tool/make-snapshot
@@ -7,10 +7,12 @@ require 'fileutils'
 require 'tmpdir'
 STDOUT.sync = true
 
-$exported = nil if $exported == ""
-$archname = nil if $archname == ""
+$exported = nil if ($exported ||= nil) == ""
+$archname = nil if ($archname ||= nil) == ""
 $keep_temp ||= nil
 $patch_file ||= nil
+$packages ||= nil
+$digests ||= nil
 $tooldir = File.expand_path("..", __FILE__)
 
 def usage
@@ -101,7 +103,7 @@ end
   end
 end
 
-if $help or $_help
+if defined?($help) or defined?($_help)
   puts usage
   exit
 end