From 9ae3b070c12851600273463fff14bb79b101440d Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 30 Jun 2009 07:55:36 +0000
Subject: * tool/mkconfig.rb (RbConfig.expand): get rid of exceptions on  
 frozen strings unless really changed.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@23913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 tool/mkconfig.rb | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

(limited to 'tool/mkconfig.rb')

diff --git a/tool/mkconfig.rb b/tool/mkconfig.rb
index 116791dafe..a66a20f3e8 100755
--- a/tool/mkconfig.rb
+++ b/tool/mkconfig.rb
@@ -181,21 +181,21 @@ print <<EOS
   MAKEFILE_CONFIG = {}
   CONFIG.each{|k,v| MAKEFILE_CONFIG[k] = v.dup}
   def RbConfig::expand(val, config = CONFIG)
-    val.gsub!(/\\$\\$|\\$\\(([^()]+)\\)|\\$\\{([^{}]+)\\}/) do
+    newval = val.gsub(/\\$\\$|\\$\\(([^()]+)\\)|\\$\\{([^{}]+)\\}/) {
       var = $&
       if !(v = $1 || $2)
 	'$'
       elsif key = config[v = v[/\\A[^:]+(?=(?::(.*?)=(.*))?\\z)/]]
 	pat, sub = $1, $2
 	config[v] = false
-	RbConfig::expand(key, config)
-	config[v] = key
+	config[v] = RbConfig::expand(key, config)
 	key = key.gsub(/\#{Regexp.quote(pat)}(?=\\s|\\z)/n) {sub} if pat
 	key
       else
 	var
       end
-    end
+    }
+    val.replace(newval) unless newval == val
     val
   end
   CONFIG.each_value do |val|
-- 
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