skip failed gems

* tool/rbinstall.rb: skip gems which failed to build extensions.
  [ruby-dev:49764] [Bug #12683]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Aug 18 02:36:26 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* tool/rbinstall.rb: skip gems which failed to build extensions.
+	  [ruby-dev:49764] [Bug #12683]
+
 Wed Aug 17 23:35:12 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* gems/bundled_gems (tk): bump up to 0.1.1.

tool/rbinstall.rb

@@ -777,8 +777,15 @@ install?(:ext, :comm, :gem) do
   next if gems.empty?
   if defined?(Zlib)
     Gem.instance_variable_set(:@ruby, with_destdir(File.join(bindir, ruby_install_name)))
+    silent = Gem::SilentUI.new
     gems.each do |gem|
-      Gem.install(gem, Gem::Requirement.default, options)
+      inst = Gem::Installer.new(gem, options)
+      inst.spec.extension_dir = with_destdir(inst.spec.extension_dir)
+      begin
+        Gem::DefaultUserInteraction.use_ui(silent) {inst.install}
+      rescue Gem::InstallError => e
+        next
+      end
       gemname = File.basename(gem)
       puts "#{" "*30}#{gemname}"
     end