* tool/rbinstall.rb (Gem::Specification): may not be defined when

cross-compiling and BASERUBY is 1.8.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32841 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Aug  4 15:44:10 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* tool/rbinstall.rb (Gem::Specification): may not be defined when
+	  cross-compiling and BASERUBY is 1.8.
+
 Thu Aug  4 11:30:36 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* include/ruby/missing.h: define __syscall on OpenBSD as r32702.

tool/rbinstall.rb

@@ -17,6 +17,7 @@ require 'fileutils'
 require 'shellwords'
 require 'optparse'
 require 'optparse/shellwords'
+require 'ostruct'
 
 STDOUT.sync = true
 File.umask(0)
@@ -533,6 +534,26 @@ install?(:local, :comm, :man) do
 end
 
 # :stopdoc:
+module Gem
+  if defined?(Specification)
+    remove_const(:Specification)
+  end
+
+  class Specification < OpenStruct
+    def initialize(*)
+      super
+      yield(self) if defined?(yield)
+      self.executables ||= []
+    end
+
+    def self.load(path)
+      src = File.open(path, "rb") {|f| f.read}
+      src.sub!(/\A#.*/, '')
+      eval(src, nil, path)
+    end
+  end
+end
+
 module RbInstall
   module Specs
     class Reader < Struct.new(:name, :src, :execs)