Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/ruby/Rakefile

 require "rubygems"
 require "rubygems/package_task"
 require "rake/extensiontask" unless RUBY_PLATFORM == "java"
 require "rake/testtask"
 
 spec = Gem::Specification.load("google-protobuf.gemspec")
 
+well_known_protos = %w[
+  google/protobuf/any.proto
+  google/protobuf/api.proto
+  google/protobuf/duration.proto
+  google/protobuf/empty.proto
+  google/protobuf/field_mask.proto
+  google/protobuf/source_context.proto
+  google/protobuf/struct.proto
+  google/protobuf/timestamp.proto
+  google/protobuf/type.proto
+  google/protobuf/wrappers.proto
+]
+
+# These are omitted for now because we don't support proto2.
+proto2_protos = %w[
+  google/protobuf/descriptor.proto
+  google/protobuf/compiler/plugin.proto
+]
+
+genproto_output = []
+
+# We won't have access to .. from within docker, but the proto files
+# will be there, thanks to the :genproto rule dependency for gem:native.
+unless ENV['IN_DOCKER'] == 'true'
+  well_known_protos.each do |proto_file|
+    input_file = "../src/" + proto_file
+    output_file = "lib/" + proto_file.sub(/\.proto$/, ".rb")
+    genproto_output << output_file
+    file output_file => input_file do |file_task|
+      sh "../src/protoc -I../src --ruby_out=lib #{input_file}"
+    end
+  end
+end
+
 if RUBY_PLATFORM == "java"
   if `which mvn` == ''
     raise ArgumentError, "maven needs to be installed"
   end
   task :clean do
     system("mvn clean")
   end
 
   task :compile do
     system("mvn package")
   end
 else
   Rake::ExtensionTask.new("protobuf_c", spec) do |ext|
     ext.ext_dir = "ext/google/protobuf_c"
     ext.lib_dir = "lib/google"
+    ext.cross_compile = true
+    ext.cross_platform = [
+      'x86-mingw32', 'x64-mingw32',
+      'x86_64-linux', 'x86-linux',
+      'universal-darwin'
+    ]
+  end
+
+  task 'gem:windows' do
+    require 'rake_compiler_dock'
+    RakeCompilerDock.sh "bundle && IN_DOCKER=true rake cross native gem RUBY_CC_VERSION=2.3.0:2.2.2:2.1.5:2.0.0"
+  end
+
+  if RUBY_PLATFORM =~ /darwin/
+    task 'gem:native' do
+      system "rake genproto"
+      system "rake cross native gem RUBY_CC_VERSION=2.3.0:2.2.2:2.1.5:2.0.0"
+    end
+  else
+    task 'gem:native' => [:genproto, 'gem:windows']
   end
 end
 
+
+# Proto for tests.
+genproto_output << "tests/generated_code.rb"
+file "tests/generated_code.rb" => "tests/generated_code.proto" do |file_task|
+  sh "../src/protoc --ruby_out=. tests/generated_code.proto"
+end
+
+task :genproto => genproto_output
+
+task :clean do
+  sh "rm -f #{genproto_output.join(' ')}"
+end
+
 Gem::PackageTask.new(spec) do |pkg|
 end
 
 Rake::TestTask.new(:test => :build) do |t|
   t.test_files = FileList["tests/*.rb"]
 end
 
-task :build => [:clean, :compile]
+task :build => [:clean, :compile, :genproto]
 task :default => [:build]
 
 # vim:sw=2:et