rbinstall.rb: add date

* tool/rbinstall.rb (Gem::Specification#initialize): default date to
  RUBY_RELEASE_DATE.  [ruby-core:57072] [Bug #8878]
* tool/rbinstall.rb (Gem::Specification#to_ruby): add date.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42890 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/tool/rbinstall.rb b/tool/rbinstall.rb
index 29866dfffd..b47b6e15fe 100755
--- a/tool/rbinstall.rb
+++ b/tool/rbinstall.rb
@@ -560,6 +560,7 @@ module Gem
       super
       yield(self) if defined?(yield)
       self.executables ||= []
+      self.date ||= RUBY_RELEASE_DATE
     end
 
     def self.load(path)
@@ -573,6 +574,7 @@ module Gem
 Gem::Specification.new do |s|
   s.name = #{name.dump}
   s.version = #{version.dump}
+  s.date = #{date.dump}
   s.summary = #{summary.dump}
   s.description = #{description.dump}
   s.homepage = #{homepage.dump}