Ignore to handle the different platform

When `GEM_HOME` was shared with CRuby and JRuby. RubyGems try to
  handle both platforms. It should be ignored the different platform.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67190 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/basic_specification.rb

@@ -71,8 +71,11 @@ class Gem::BasicSpecification
     elsif missing_extensions?
       @ignored = true
 
+      if platform == RUBY_ENGINE
         warn "Ignoring #{full_name} because its extensions are not built. " +
           "Try: gem pristine #{name} --version #{version}"
+      end
+
       return false
     end
 

lib/rubygems/commands/pristine_command.rb

@@ -104,6 +104,8 @@ extensions will be restored.
               end.flatten
             end
 
+    specs = specs.select{|spec| spec.platform == RUBY_ENGINE }
+
     if specs.to_a.empty?
       raise Gem::Exception,
             "Failed to find gems #{options[:args]} #{options[:version]}"

test/rubygems/test_gem_commands_pristine_command.rb

@@ -514,6 +514,47 @@ class TestGemCommandsPristineCommand < Gem::TestCase
     assert_empty(@ui.error)
   end
 
+  def test_execute_multi_platform
+    a = util_spec 'a' do |s|
+      s.extensions << 'ext/a/extconf.rb'
+    end
+
+    b = util_spec 'b' do |s|
+      s.extensions << 'ext/a/extconf.rb'
+      s.platform = Gem::Platform.new("java")
+    end
+
+    ext_path = File.join @tempdir, 'ext', 'a', 'extconf.rb'
+    write_file ext_path do |io|
+      io.write <<-'RUBY'
+      File.open "Makefile", "w" do |f|
+        f.puts "clean:\n\techo cleaned\n"
+        f.puts "all:\n\techo built\n"
+        f.puts "install:\n\techo installed\n"
+      end
+      RUBY
+    end
+
+    install_gem a
+    install_gem b
+
+    @cmd.options[:extensions]     = true
+    @cmd.options[:extensions_set] = true
+    @cmd.options[:args] = []
+
+    use_ui @ui do
+      @cmd.execute
+    end
+
+    out = @ui.output.split "\n"
+
+    assert_equal 'Restoring gems to pristine condition...', out.shift
+    assert_equal 'Building native extensions. This could take a while...',
+                 out.shift
+    assert_equal "Restored #{a.full_name}", out.shift
+    assert_empty out, out.inspect
+  end
+
   def test_handle_options
     @cmd.handle_options %w[]
 

test/rubygems/test_gem_specification.rb

@@ -6,6 +6,7 @@ require 'stringio'
 require 'rubygems/ext'
 require 'rubygems/specification'
 require 'rubygems/installer'
+require 'rubygems/platform'
 
 class TestGemSpecification < Gem::TestCase
 
@@ -59,12 +60,13 @@ end
     end
   end
 
-  def ext_spec
+  def ext_spec(platform: Gem::Platform::RUBY)
     @ext = util_spec 'ext', '1' do |s|
       s.executable = 'exec'
       s.test_file = 'test/suite.rb'
       s.extensions = %w[ext/extconf.rb]
       s.license = 'MIT'
+      s.platform = platform
 
       s.mark_version
       s.files = %w[lib/code.rb]
@@ -1673,6 +1675,16 @@ dependencies: []
     assert_equal expected, err
   end
 
+  def test_contains_requirable_file_eh_extension
+    ext_spec(platform: Gem::Platform.new("java"))
+
+    _, err = capture_io do
+      refute @ext.contains_requirable_file? 'nonexistent'
+    end
+
+    assert_empty err
+  end
+
   def test_date
     assert_equal Gem::Specification::TODAY, @a1.date
   end