Merge pull request #755 from masuidrive/imprive_build_scripts

Improved build scripts and config files

25 files changed, 786 insertions, 515 deletions

diff --git a/Rakefile b/Rakefile
index fd0336033..f0991d323 100644
--- a/Rakefile
+++ b/Rakefile
@@ -4,14 +4,13 @@
 
 load 'tasks/ruby_ext.rake'
 load 'tasks/mruby_build.rake'
-load 'tasks/mruby_gem_spec.rake'
+load 'tasks/mrbgem_spec.rake'
 
 ##############################
 # compile flags
 MRUBY_CONFIG = File.expand_path(ENV['MRUBY_CONFIG'] || './build_config.rb')
 load MRUBY_CONFIG
 
-load 'tasks/rules.rake'
 load 'src/mruby_core.rake'
 load 'mrblib/mrblib.rake'
 load 'tools/mrbc/mrbc.rake'
@@ -29,27 +28,26 @@ load 'test/mrbtest.rake'
 task :default => :all
 
 depfiles = MRuby.targets['host'].bins.map do |bin|
-  install_path = exefile("bin/#{bin}")
+  install_path = MRuby.targets['host'].exefile("bin/#{bin}")
   
-  file install_path => exefile("build/host/bin/#{bin}") do |t|
+  file install_path => MRuby.targets['host'].exefile("build/host/bin/#{bin}") do |t|
     FileUtils.cp t.prerequisites.first, t.name
   end
    
   install_path
 end
 
-depfiles += MRuby.targets.reject {|n,t| n == 'host' }.map { |n, t|
-  ["#{t.build_dir}/lib/libmruby.a"] + t.bins.map { |bin| exefile("#{t.build_dir}/bin/#{bin}") }
+depfiles += MRuby.targets.reject { |n, t| n == 'host' }.map { |n, t|
+  [t.libfile("#{t.build_dir}/lib/libmruby")] + t.bins.map { |bin| t.exefile("#{t.build_dir}/bin/#{bin}") }
 }.flatten
 
 desc "build all targets, install (locally) in-repo"
 task :all => depfiles
 
 desc "run all mruby tests"
-task :test => MRuby.targets.values.map { |t| exefile("#{t.build_dir}/test/mrbtest") } do
-  sh "#{filename exefile('build/host/test/mrbtest')}"
-  if MRuby.targets.count > 1
-    puts "\nYou should run #{MRuby.targets.map{ |t| t.name == 'host' ? nil : "#{t.build_dir}/test/mrbtest" }.compact.join(', ')} on target device."
+task :test => MRuby.targets.values.map { |t| t.exefile("#{t.build_dir}/test/mrbtest") } do
+  MRuby.each_target do
+    run_test
   end
 end
 
@@ -59,4 +57,5 @@ task :clean do
     FileUtils.rm_rf t.build_dir
   end
   FileUtils.rm_f depfiles
+  puts "Cleaned up build folder"
 end
diff --git a/build_config.rb b/build_config.rb
index 4e80a2596..1c177fdac 100644
--- a/build_config.rb
+++ b/build_config.rb
@@ -1,55 +1,76 @@
 MRuby::Build.new do |conf|
-  conf.cc = ENV['CC'] || 'gcc'
-  conf.ld = ENV['LD'] || 'gcc'
-  conf.ar = ENV['AR'] || 'ar'
-  # conf.bins = %w(mrbc mruby mirb)
-  # conf.cxx = conf.cc
-  # conf.objcc = conf.cc
-  # conf.asm = conf.cc
-  # conf.yacc = 'bison'
-  # conf.gperf = 'gperf'
-  # conf.cat = 'cat'
-  # conf.git = 'git'
-
-  conf.cflags << (ENV['CFLAGS'] || %w(-g -O3 -Wall -Werror-implicit-function-declaration))
-  conf.ldflags << (ENV['LDFLAGS'] || %w(-lm))
-  # conf.cxxflags = []
-  # conf.objccflags = []
-  # conf.asmflags = []
+  # load specific toolchain settings
+  toolchain :gcc
 
+  # Use mrbgems
   # conf.gem 'doc/mrbgems/ruby_extension_example'
-  # conf.gem 'doc/mrbgems/c_extension_example'
+  # conf.gem 'doc/mrbgems/c_extension_example' do |g|
+  #   g.cc.flags << '-g' # append cflags in this gem
+  # end
   # conf.gem 'doc/mrbgems/c_and_ruby_extension_example'
-  # conf.gem :git => '[email protected]:masuidrive/mrbgems-example.git', :branch => 'master'
-end
+  # conf.gem :github => 'masuidrive/mrbgems-example', :branch => 'master'
+  # conf.gem :git => '[email protected]:masuidrive/mrbgems-example.git', :branch => 'master', :options => '-v'
 
-=begin
-MRuby::CrossBuild.new('i386') do |conf|
-  conf.cc = ENV['CC'] || 'gcc'
-  conf.ld = ENV['LD'] || 'gcc'
-  conf.ar = ENV['AR'] || 'ar'
+  # Generate binaries
   # conf.bins = %w(mrbc mruby mirb)
-  # conf.cxx = 'gcc'
-  # conf.objcc = 'gcc'
-  # conf.asm = 'gcc'
-  # conf.yacc = 'bison'
-  # conf.gperf = 'gperf'
-  # conf.cat = 'cat'
-  # conf.git = 'git'
+  
+  # C compiler settings
+  # conf.cc do |cc|
+  #   cc.command = ENV['CC'] || 'gcc'
+  #   cc.flags = [ENV['CFLAGS'] || %w()]
+  #   cc.include_paths = ["#{root}/include"]
+  #   cc.defines = %w(DISABLE_GEMS)
+  #   cc.option_include_path = '-I%s'
+  #   cc.option_define = '-D%s'
+  #   cc.compile_options = "%{flags} -MMD -o %{outfile} -c %{infile}"
+  # end
 
-  if ENV['OS'] == 'Windows_NT' # MinGW
-    conf.cflags = %w(-g -O3 -Wall -Werror-implicit-function-declaration -Di386_MARK)
-    conf.ldflags = %w(-s -static)
-  else
-    conf.cflags << %w(-g -O3 -Wall -Werror-implicit-function-declaration -arch i386)
-    conf.ldflags << %w(-arch i386)
-  end
-  # conf.cxxflags << []
-  # conf.objccflags << []
-  # conf.asmflags << []
+  # Linker settings
+  # conf.linker do |linker|
+  #   linker.command = ENV['LD'] || 'gcc'
+  #   linker.flags = [ENV['LDFLAGS'] || []]
+  #   linker.libraries = %w()
+  #   linker.library_paths = []
+  #   linker.option_library = '-l%s'
+  #   linker.option_library_path = '-L%s'
+  #   linker.link_options = "%{flags} -o %{outfile} %{objs} %{libs}"
+  # end
+ 
+  # Archiver settings
+  # conf.archiver do |archiver|
+  #   archiver.command = ENV['AR'] || 'ar'
+  #   archiver.archive_options = 'rs %{outfile} %{objs}'
+  # end
+ 
+  # Parser generator settings
+  # conf.yacc do |yacc|
+  #   yacc.command = ENV['YACC'] || 'bison'
+  #   yacc.compile_options = '-o %{outfile} %{infile}'
+  # end
+ 
+  # gperf settings
+  # conf.gperf do |gperf|
+  #   gperf.command = 'gperf'
+  #   gperf.compile_options = '-L ANSI-C -C -p -j1 -i 1 -g -o -t -N mrb_reserved_word -k"1,3,$" %{infile} > %{outfile}'
+  # end
+  
+  # file extensions
+  # conf.exts do |exts|
+  #   exts.object = '.o'
+  #   exts.executable = '' # '.exe' if Windows
+  #   exts.library = '.a'
+  # end
 
-  # conf.gem 'doc/mrbgems/ruby_extension_example'
-  # conf.gem 'doc/mrbgems/c_extension_example'
-  # conf.gem 'doc/mrbgems/c_and_ruby_extension_example'
+  # file separetor
+  # conf.file_separator = '/'
 end
-=end
\ No newline at end of file
+
+# Define cross build settings
+# MRuby::CrossBuild.new('32bit') do |conf|
+#   toolchain :gcc
+#   
+#   conf.cc.flags << "-m32"
+#   conf.linker.flags << "-m32"
+#   
+#   conf.gem 'doc/mrbgems/c_and_ruby_extension_example'
+# end
diff --git a/doc/mrbgems/c_and_ruby_extension_example/mrbgem.rake b/doc/mrbgems/c_and_ruby_extension_example/mrbgem.rake
index 9309436aa..64fa1972f 100644
--- a/doc/mrbgems/c_and_ruby_extension_example/mrbgem.rake
+++ b/doc/mrbgems/c_and_ruby_extension_example/mrbgem.rake
@@ -2,16 +2,19 @@ MRuby::Gem::Specification.new('c_and_ruby_extension_example') do |spec|
   spec.license = 'MIT'
   spec.authors = 'mruby developers'
  
-  # spec.cflags = ''
- 
-  # spec.mruby_cflags = ''
-  # spec.mruby_ldflags = ''
-  # spec.mruby_libs = ''
-  # spec.mruby_includes = ["#{spec.dir}/include"]
- 
+  # Add compile flags
+  # spec.cc.flags << ''
+
+  # Add cflags to all
+  # spec.mruby.cc.flags << '-g'
+
+  # Add libraries
+  # spec.linker.libraries << 'external_lib'
+
+  # Default building fules
   # spec.rbfiles = Dir.glob("#{dir}/mrblib/*.rb")
-  # spec.objs = Dir.glob("#{dir}/src/*.{c,cpp,m,asm,S}").map { |f| f.relative_path_from(dir).pathmap("#{build_dir}/%X.o") }
+  # spec.objs = Dir.glob("#{dir}/src/*.{c,cpp,m,asm,S}").map { |f| objfile(f.relative_path_from(dir).pathmap("#{build_dir}/%X")) }
   # spec.test_rbfiles = Dir.glob("#{dir}/test/*.rb")
-  # spec.test_objs = Dir.glob("#{dir}/test/*.{c,cpp,m,asm,S}").map { |f| f.relative_path_from(dir).pathmap("#{build_dir}/%X.o") }
+  # spec.test_objs = Dir.glob("#{dir}/test/*.{c,cpp,m,asm,S}").map { |f| objfile(f.relative_path_from(dir).pathmap("#{build_dir}/%X")) }
   # spec.test_preload = 'test/assert.rb'
 end
diff --git a/doc/mrbgems/c_extension_example/mrbgem.rake b/doc/mrbgems/c_extension_example/mrbgem.rake
index 289f87d7f..6bcb6e105 100644
--- a/doc/mrbgems/c_extension_example/mrbgem.rake
+++ b/doc/mrbgems/c_extension_example/mrbgem.rake
@@ -2,16 +2,19 @@ MRuby::Gem::Specification.new('c_extension_example') do |spec|
   spec.license = 'MIT'
   spec.authors = 'mruby developers'
  
-  # spec.cflags = ''
- 
-  # spec.mruby_cflags = ''
-  # spec.mruby_ldflags = ''
-  # spec.mruby_libs = ''
-  # spec.mruby_includes = ["#{spec.dir}/include"]
+  # Add compile flags
+  # spec.cc.flags << '-g'
+
+  # Add cflags to all
+  # spec.mruby.cc.flags << '-g'
+
+  # Add libraries
+  # spec.linker.libraries << 'external_lib'
 
+  # Default building fules
   # spec.rbfiles = Dir.glob("#{dir}/mrblib/*.rb")
-  # spec.objs = Dir.glob("#{dir}/src/*.{c,cpp,m,asm,S}").map { |f| f.relative_path_from(dir).pathmap("#{build_dir}/%X.o") }
+  # spec.objs = Dir.glob("#{dir}/src/*.{c,cpp,m,asm,S}").map { |f| objfile(f.relative_path_from(dir).pathmap("#{build_dir}/%X")) }
   # spec.test_rbfiles = Dir.glob("#{dir}/test/*.rb")
-  # spec.test_objs = Dir.glob("#{dir}/test/*.{c,cpp,m,asm,S}").map { |f| f.relative_path_from(dir).pathmap("#{build_dir}/%X.o") }
+  # spec.test_objs = Dir.glob("#{dir}/test/*.{c,cpp,m,asm,S}").map { |f| objfile(f.relative_path_from(dir).pathmap("#{build_dir}/%X")) }
   # spec.test_preload = 'test/assert.rb'
 end
diff --git a/doc/mrbgems/ruby_extension_example/mrbgem.rake b/doc/mrbgems/ruby_extension_example/mrbgem.rake
index 80a299187..0a1e62b1c 100644
--- a/doc/mrbgems/ruby_extension_example/mrbgem.rake
+++ b/doc/mrbgems/ruby_extension_example/mrbgem.rake
@@ -2,16 +2,19 @@ MRuby::Gem::Specification.new('ruby_extension_example') do |spec|
   spec.license = 'MIT'
   spec.authors = 'mruby developers'
  
-  # spec.cflags = ''
- 
-  # spec.mruby_cflags = ''
-  # spec.mruby_ldflags = ''
-  # spec.mruby_libs = ''
-  # spec.mruby_includes = ["#{spec.dir}/include"]
- 
+  # Add compile flags
+  # spec.cc.flags << ''
+
+  # Add cflags to all
+  # spec.mruby.cc.flags << '-g'
+
+  # Add libraries
+  # spec.linker.libraries << 'external_lib'
+
+  # Default building fules
   # spec.rbfiles = Dir.glob("#{dir}/mrblib/*.rb")
-  # spec.objs = Dir.glob("#{dir}/src/*.{c,cpp,m,asm,S}").map { |f| f.relative_path_from(dir).pathmap("#{build_dir}/%X.o") }
+  # spec.objs = Dir.glob("#{dir}/src/*.{c,cpp,m,asm,S}").map { |f| objfile(f.relative_path_from(dir).pathmap("#{build_dir}/%X")) }
   # spec.test_rbfiles = Dir.glob("#{dir}/test/*.rb")
-  # spec.test_objs = Dir.glob("#{dir}/test/*.{c,cpp,m,asm,S}").map { |f| f.relative_path_from(dir).pathmap("#{build_dir}/%X.o") }
+  # spec.test_objs = Dir.glob("#{dir}/test/*.{c,cpp,m,asm,S}").map { |f| objfile(f.relative_path_from(dir).pathmap("#{build_dir}/%X")) }
   # spec.test_preload = 'test/assert.rb'
 end
diff --git a/include/mrbconf.h b/include/mrbconf.h
index 80c8bd6fa..066c040f6 100644
--- a/include/mrbconf.h
+++ b/include/mrbconf.h
@@ -125,6 +125,7 @@ typedef short mrb_sym;
 #endif
 
 #ifdef _MSC_VER
+# include <float.h>
 # define inline __inline
 # define snprintf _snprintf
 # define isnan _isnan
diff --git a/mrblib/mrblib.rake b/mrblib/mrblib.rake
index 5dab4cee9..493207db4 100644
--- a/mrblib/mrblib.rake
+++ b/mrblib/mrblib.rake
@@ -1,15 +1,14 @@
-dir = File.dirname(__FILE__).sub(%r|^\./|, '')
-
 MRuby.each_target do
-  self.libmruby << "#{build_dir}/#{dir}/mrblib.o"
+  dir = File.dirname(__FILE__).relative_path_from(root)
+  self.libmruby << objfile("#{build_dir}/#{dir}/mrblib")
 
-  file "#{build_dir}/#{dir}/mrblib.o" => "#{build_dir}/#{dir}/mrblib.c"
+  file objfile("#{build_dir}/#{dir}/mrblib") => "#{build_dir}/#{dir}/mrblib.c"
   file "#{build_dir}/#{dir}/mrblib.c" => [mrbcfile] + Dir.glob("#{dir}/*.rb") do |t|
-    mrbc, *rbfiles = t.prerequisites
+    mrbc_, *rbfiles = t.prerequisites
     FileUtils.mkdir_p File.dirname(t.name)
     open(t.name, 'w') do |f|
       f.puts File.read("#{dir}/init_mrblib.c")
-      compile_mruby f, rbfiles, 'mrblib_irep'
+      mrbc.run f, rbfiles, 'mrblib_irep'
     end
   end
 end
diff --git a/src/mruby_core.rake b/src/mruby_core.rake
index 7db1dbf77..44d62c1e9 100644
--- a/src/mruby_core.rake
+++ b/src/mruby_core.rake
@@ -1,25 +1,25 @@
-dir = File.dirname(__FILE__).sub(%r|^\./|, '')
-
 MRuby.each_target do
+  dir = File.dirname(__FILE__).relative_path_from(root)
+
   lex_def = "#{dir}/lex.def"
-  objs = Dir.glob("src/*.{c}").map { |f| f.pathmap("#{build_dir}/%X.o") } + ["#{build_dir}/#{dir}/y.tab.o"]
+  objs = Dir.glob("src/*.{c}").map { |f| objfile(f.pathmap("#{build_dir}/%X")) } + [objfile("#{build_dir}/#{dir}/y.tab")]
   self.libmruby << objs
 
-  file "#{build_dir}/lib/libmruby_core.a" => objs do |t|
-    archive t.name, 'rs', t.prerequisites
+  file libfile("#{build_dir}/lib/libmruby_core") => objs do |t|
+    archiver.run t.name, t.prerequisites
   end
 
   # Parser
   file "#{build_dir}/#{dir}/y.tab.c" => ["#{dir}/parse.y"] do |t|
-    run_yacc t.name, t.prerequisites.first
+    yacc.run t.name, t.prerequisites.first
   end
 
-  file "#{build_dir}/#{dir}/y.tab.o" => ["#{build_dir}/#{dir}/y.tab.c", lex_def] do |t|
-    compile_c t.name, t.prerequisites.first, [], dir
+  file objfile("#{build_dir}/#{dir}/y.tab") => ["#{build_dir}/#{dir}/y.tab.c", lex_def] do |t|
+    cc.run t.name, t.prerequisites.first, [], [dir]
   end
 
   # Lexical analyzer
   file lex_def => "#{dir}/keywords" do |t|
-    run_gperf t.name, t.prerequisites.first
+    gperf.run t.name, t.prerequisites.first
   end
 end
diff --git a/tasks/libmruby.rake b/tasks/libmruby.rake
index 9f5cc555a..c3b9d714f 100644
--- a/tasks/libmruby.rake
+++ b/tasks/libmruby.rake
@@ -1,5 +1,5 @@
 MRuby.each_target do
-  file "#{build_dir}/lib/libmruby.a" => libmruby.flatten do |t|
-    archive t.name, 'rs', t.prerequisites
+  file libfile("#{build_dir}/lib/libmruby") => libmruby.flatten do |t|
+    archiver.run t.name, t.prerequisites
   end
 end
diff --git a/tasks/mrbgem_spec.rake b/tasks/mrbgem_spec.rake
new file mode 100644
index 000000000..e21e0b670
--- /dev/null
+++ b/tasks/mrbgem_spec.rake
@@ -0,0 +1,139 @@
+require 'pathname'
+require 'forwardable'
+
+module MRuby
+  module Gem
+    class << self
+      attr_accessor :current
+    end
+    LinkerConfig = Struct.new(:libraries, :library_paths, :flags) 
+
+    class Specification
+      include Rake::DSL
+      extend Forwardable
+      def_delegators :@build, :filename, :objfile, :libfile, :exefile
+
+      attr_accessor :name, :dir, :build
+      alias mruby build
+      attr_accessor :build_config_initializer
+
+      attr_accessor :licenses, :authors
+      alias :license= :licenses=
+      alias :author= :authors=
+
+      attr_accessor :rbfiles, :objs
+      attr_accessor :test_objs, :test_rbfiles
+      attr_accessor :test_preload
+
+      attr_block MRuby::Build::COMMANDS
+
+      def initialize(name, &block)
+        @name = name
+        @initializer = block
+        MRuby::Gem.current = self
+      end
+
+      def setup
+        MRuby::Gem.current = self
+        MRuby::Build::COMMANDS.each do |command|
+          instance_variable_set("@#{command}", @build.send(command).clone)
+        end
+        @linker = LinkerConfig.new([], [], [])
+
+        compilers.each do |compiler|
+          compiler.defines -= %w(DISABLE_GEMS)
+          compiler.include_paths << "#{dir}/include"
+        end
+
+        @rbfiles = Dir.glob("#{dir}/mrblib/*.rb")
+        @objs = Dir.glob("#{dir}/src/*.{c,cpp,m,asm,S}").map { |f| objfile(f.relative_path_from(@dir).to_s.pathmap("#{build_dir}/%X")) }
+        @objs << objfile("#{build_dir}/gem_init")
+
+        @test_rbfiles = Dir.glob("#{dir}/test/*.rb")
+        @test_objs = Dir.glob("#{dir}/test/*.{c,cpp,m,asm,S}").map { |f| objfile(f.relative_path_from(dir).to_s.pathmap("#{build_dir}/%X")) }
+        @test_preload = 'test/assert.rb'
+
+        instance_eval(&@initializer)
+
+        if !name || !licenses || !authors
+          fail "#{name || dir} required to set name, license(s) and author(s)"
+        end
+
+        build.libmruby << @objs
+
+        instance_eval(&@build_config_initializer) if @build_config_initializer
+
+        compilers.each do |compiler|
+          compiler.define_rules build_dir, "#{dir}/"
+        end
+
+        define_gem_init_builder
+      end
+
+      def build_dir
+        "#{build.build_dir}/mrbgems/#{name}"
+      end
+
+      def testlib
+        libfile("#{build_dir}/libmrb-#{name}-gem-test")
+      end
+
+      def funcname
+        @funcname ||= @name.gsub('-', '_')
+      end
+
+      def compilers
+        MRuby::Build::COMPILERS.map do |c|
+          instance_variable_get("@#{c}")
+        end
+      end
+
+      def define_gem_init_builder
+        file objfile("#{build_dir}/gem_init") => "#{build_dir}/gem_init.c"
+        file "#{build_dir}/gem_init.c" => [build.mrbcfile] + rbfiles do |t|
+          FileUtils.mkdir_p build_dir
+          generate_gem_init("#{build_dir}/gem_init.c")
+        end
+      end
+
+      def generate_gem_init(fname)
+        open(fname, 'w') do |f|
+          print_gem_init_header f
+          build.mrbc.run f, rbfiles, "gem_mrblib_irep_#{funcname}" unless rbfiles.empty?
+          f.puts %Q[void mrb_#{funcname}_gem_init(mrb_state *mrb);]
+          f.puts %Q[void GENERATED_TMP_mrb_#{funcname}_gem_init(mrb_state *mrb) {]
+          f.puts %Q[  int ai = mrb_gc_arena_save(mrb);]
+          f.puts %Q[  mrb_#{funcname}_gem_init(mrb);] if objs != [objfile("#{build_dir}/gem_init")]
+          unless rbfiles.empty?
+            f.puts %Q[  mrb_load_irep(mrb, gem_mrblib_irep_#{funcname});]
+            f.puts %Q[  if (mrb->exc) {]
+            f.puts %Q[    mrb_p(mrb, mrb_obj_value(mrb->exc));]
+            f.puts %Q[    exit(0);]
+            f.puts %Q[  }]
+          end
+          f.puts %Q[  mrb_gc_arena_restore(mrb, ai);]
+          f.puts %Q[}]
+        end
+      end # generate_gem_init
+
+      def print_gem_init_header(f)
+        f.puts %Q[/*]
+        f.puts %Q[ * This file is loading the irep]
+        f.puts %Q[ * Ruby GEM code.]
+        f.puts %Q[ *]
+        f.puts %Q[ * IMPORTANT:]
+        f.puts %Q[ *   This file was generated!]
+        f.puts %Q[ *   All manual changes will get lost.]
+        f.puts %Q[ */]
+        f.puts %Q[#include "mruby.h"]
+        f.puts %Q[#include "mruby/irep.h"]
+        f.puts %Q[#include "mruby/dump.h"]
+        f.puts %Q[#include "mruby/string.h"]
+        f.puts %Q[#include "mruby/proc.h"]
+        f.puts %Q[#include "mruby/variable.h"]
+        f.puts %Q[#include "mruby/array.h"]
+      end
+
+    end # Specification
+  end # Gem
+end # MRuby
diff --git a/tasks/mrbgems.rake b/tasks/mrbgems.rake
index 07e412b53..dc5e67eef 100644
--- a/tasks/mrbgems.rake
+++ b/tasks/mrbgems.rake
@@ -1,35 +1,34 @@
-dir = File.dirname(__FILE__).sub(%r|^\./|, '')
-
 MRuby.each_target do
-  if enable_gems?
-    self.libmruby << "#{build_dir}/mrbgems/gem_init.o"
+  dir = File.dirname(__FILE__).relative_path_from(root)
 
-    file "#{build_dir}/mrbgems/gem_init.o" => "#{build_dir}/mrbgems/gem_init.c"
-    file "#{build_dir}/mrbgems/gem_init.c" do |t|
+  if enable_gems?
+    # set up all gems
+    gems.each(&:setup)
+    
+    # loader all gems
+    self.libmruby << objfile("#{build_dir}/mrbgems/gem_init")
+    file objfile("#{build_dir}/mrbgems/gem_init") => "#{build_dir}/mrbgems/gem_init.c"
+    file "#{build_dir}/mrbgems/gem_init.c" => [MRUBY_CONFIG] do |t|
       FileUtils.mkdir_p "#{build_dir}/mrbgems"
       open(t.name, 'w') do |f|
-        f.puts <<__EOF__
-/*
- * This file contains a list of all
- * initializing methods which are
- * necessary to bootstrap all gems.
- *
- * IMPORTANT:
- *   This file was generated!
- *   All manual changes will get lost.
- */
-
-#include "mruby.h"
-
-#{gems.map{|gem| "void GENERATED_TMP_mrb_%s_gem_init(mrb_state* mrb);" % [gem.funcname]}.join("\n")}
-void
-mrb_init_mrbgems(mrb_state *mrb) {
-#{gems.map{|gem| "GENERATED_TMP_mrb_%s_gem_init(mrb);" % [gem.funcname]}.join("\n")}
-}
-__EOF__
+        f.puts %Q[/*]
+        f.puts %Q[ * This file contains a list of all]
+        f.puts %Q[ * initializing methods which are]
+        f.puts %Q[ * necessary to bootstrap all gems.]
+        f.puts %Q[ *]
+        f.puts %Q[ * IMPORTANT:]
+        f.puts %Q[ *   This file was generated!]
+        f.puts %Q[ *   All manual changes will get lost.]
+        f.puts %Q[ */]
+        f.puts %Q[]
+        f.puts %Q[#include "mruby.h"]
+        f.puts %Q[]
+        f.puts %Q[#{gems.map{|g| "void GENERATED_TMP_mrb_%s_gem_init(mrb_state* mrb);" % g.funcname}.join("\n")}]
+        f.puts %Q[void]
+        f.puts %Q[mrb_init_mrbgems(mrb_state *mrb) {]
+        f.puts %Q[#{gems.map{|g| "GENERATED_TMP_mrb_%s_gem_init(mrb);" % g.funcname}.join("\n")}]
+        f.puts %Q[}]
       end
     end
-
-    file "#{build_dir}/mrbgems/gem_init.c" => MRUBY_CONFIG
   end
 end
diff --git a/tasks/mrbgems_test.rake b/tasks/mrbgems_test.rake
index bbdc0169f..1c495be5b 100644
--- a/tasks/mrbgems_test.rake
+++ b/tasks/mrbgems_test.rake
@@ -1,21 +1,21 @@
-dir = File.dirname(__FILE__).sub(%r|^\./|, '')
-
 MRuby.each_target do
+  dir = File.dirname(__FILE__).relative_path_from(root)
+
   gems.each do |g|
     test_rbc = "#{g.build_dir}/gem_test.c"
-    test_rbobj = test_rbc.ext('o')
+    test_rbobj = test_rbc.ext(exts.object)
 
-    Rake::FileTask.define_task g.testlib => g.test_objs + [test_rbobj] do |t|
-      g.build.archive t.name, 'rs', t.prerequisites
+    file g.testlib => g.test_objs + [test_rbobj] do |t|
+      g.build.archiver.run t.name, t.prerequisites
     end
 
-    Rake::FileTask.define_task test_rbobj => test_rbc
-    Rake::FileTask.define_task test_rbc => g.test_rbfiles + [g.build.mrbcfile, "#{build_dir}/lib/libmruby.a"] do |t|
+    file test_rbobj => test_rbc
+    file test_rbc => g.test_rbfiles + [g.build.mrbcfile, libfile("#{build_dir}/lib/libmruby")] do |t|
       open(t.name, 'w') do |f|
-        f.puts g.gem_init_header
-        g.build.compile_mruby f, g.test_preload, "gem_test_irep_#{g.funcname}_preload"
+        g.print_gem_init_header(f)
+        g.build.mrbc.run f, g.test_preload, "gem_test_irep_#{g.funcname}_preload"
         g.test_rbfiles.each_with_index do |rbfile, i|
-          g.build.compile_mruby f, rbfile, "gem_test_irep_#{g.funcname}_#{i}"
+          g.build.mrbc.run f, rbfile, "gem_test_irep_#{g.funcname}_#{i}"
         end
         f.puts %Q[void mrb_#{g.funcname}_gem_test(mrb_state *mrb);] unless g.test_objs.empty?
         f.puts %Q[void GENERATED_TMP_mrb_#{g.funcname}_gem_test(mrb_state *mrb) {]
diff --git a/tasks/mruby_build.rake b/tasks/mruby_build.rake
index de9e556b4..bcae9dfd9 100644
--- a/tasks/mruby_build.rake
+++ b/tasks/mruby_build.rake
@@ -1,7 +1,8 @@
+load 'tasks/mruby_build_gem.rake'
+load 'tasks/mruby_build_commands.rake'
+
 module MRuby
   class << self
-    attr_accessor :build
-
     def targets
       @targets ||= {}
     end
@@ -13,170 +14,148 @@ module MRuby
     end
   end
 
-  class Build
-    include Rake::DSL
-    attr_accessor :name
-    attr_accessor :cc, :cflags, :includes
-    attr_accessor :ld, :ldflags, :libs
-    attr_accessor :ar
-    attr_writer :cxx, :cxxflags
-    attr_writer :objcc, :objcflags
-    attr_writer :asm, :asmflags
-    attr_accessor :bins
-    attr_accessor :gperf, :yacc
-    attr_accessor :cat, :git
-    attr_reader :root, :gems
-    attr_reader :libmruby
-
-    def initialize(&block)
-      @name ||= 'host'
-      @root = File.expand_path("#{File.dirname(__FILE__)}/..")
-      @cc, @cflags, @includes = 'gcc', %W(-DDISABLE_GEMS -MMD), %W(#{@root}/include)
-      @ldflags, @libs = [], %w(-lm)
-      @ar = 'ar'
-      @cxxflags, @objccflags, @asmflags = [], [], []
-
-      @yacc, @gperf = 'bison', 'gperf'
-      @cat, @git = 'cat', 'git'
+  class Toolchain
+    class << self
+      attr_accessor :toolchains
+    end
 
-      @bins = %w(mruby mrbc mirb)
+    def initialize(name, &block)
+      @name, @initializer = name.to_s, block
+      MRuby::Toolchain.toolchains ||= {}
+      MRuby::Toolchain.toolchains[@name] = self
+    end
 
-      @gems, @libmruby = [], []
+    def setup(conf)
+      conf.instance_eval(&@initializer)
+    end
 
-      MRuby.targets[name.to_s] = self
-      MRuby.build = self
-      instance_eval(&block)
+    def toolchain(name)
+      @@toolchains[name.to_s].setup(self)
     end
 
-    def cxx; @cxx || cc; end
-    def cxxflags; !@cxxflags || @cxxflags.empty? ? cflags : @cxxflags; end
+    def self.load
+      Dir.glob("#{File.dirname(__FILE__)}/toolchains/*.rake").each do |file|
+        Kernel.load file
+      end
+    end
+  end
+  Toolchain.load
 
-    def objcc; @objcc || cc; end
-    def objcflags; !@objcflags || @objcflags.empty? ? cflags : @objcflags; end
+  class Build
+    class << self
+      attr_accessor :current
+    end
+    include Rake::DSL
+    include LoadGems
+    attr_accessor :name, :bins, :exts, :file_separator
+    attr_reader :root, :libmruby, :gems
 
-    def asm; @asm || cc; end
-    def asmflags; !@asmflags || @asmflags.empty? ? cflags : @asmflags; end
+    COMPILERS = %w(cc cxx objc asm)
+    COMMANDS = COMPILERS + %w(linker archiver yacc gperf git exts mrbc)
+    attr_block MRuby::Build::COMMANDS
 
-    def ld; @ld || cc; end
+    Exts = Struct.new(:object, :executable, :library)
 
-    def gem(gemdir)
-      gemdir = load_external_gem(gemdir) if gemdir.is_a?(Hash)
+    def initialize(name='host', &block)
+      MRuby::Build.current = self
+      @name = name
+      @root = File.expand_path("#{File.dirname(__FILE__)}/..")
 
-      [@cflags, @cxxflags, @objcflags, @asmflags].each do |f|
-        f.delete '-DDISABLE_GEMS' if f
+      if ENV['OS'] == 'Windows_NT'
+        @exts = Exts.new('.o', '.exe', '.a')
+        @file_separator = '\\'
+      else
+        @exts = Exts.new('.o', '', '.a')
+        @file_separator = '/'
       end
-      Gem::processing_path = gemdir
-      load File.join(gemdir, "mrbgem.rake")
-    end
 
-    def load_external_gem(params)
-      if params[:github]
-        params[:git] = "[email protected]:#{params[:github]}.git"
-      end
+      @cc = Command::Compiler.new(self, %w(.c))
+      @cxx = Command::Compiler.new(self, %w(.cc .cxx .cpp))
+      @objc = Command::Compiler.new(self, %w(.m))
+      @asm = Command::Compiler.new(self, %w(.S .asm))
+      @linker = Command::Linker.new(self)
+      @archiver = Command::Archiver.new(self)
+      @yacc = Command::Yacc.new(self)
+      @gperf = Command::Gperf.new(self)
+      @git = Command::Git.new(self)
+      @mrbc = Command::Mrbc.new(self)
 
-      if params[:git]
-        url = params[:git]
-        gemdir = "build/mrbgems/#{url.match(/([-_\w]+)(\.[-_\w]+|)$/).to_a[1]}"
-        return gemdir if File.exists?(gemdir)
-        options = []
-        options << "--branch \"#{params[:branch]}\"" if params[:branch]
-        run_git_clone gemdir, url, options
-        gemdir
-      else
-        fail "unknown gem option #{params}"
-      end
-    end
+      @bins = %w(mruby mrbc mirb)
+      @gems, @libmruby = [], []
 
-    def enable_gems?
-      [email protected]?
+      MRuby.targets[name.to_s] = self
+
+      instance_eval(&block)
+
+      compilers.each do |compiler|
+        compiler.defines -= %w(DISABLE_GEMS) if respond_to?(:enable_gems?) && enable_gems?
+        compiler.define_rules build_dir
+      end
     end
 
-    def gemlibs
-      enable_gems? ? ["#{build_dir}/mrbgems/gem_init.o"] + @gems.map{ |g| g.lib } : []
+    def toolchain(name)
+      Toolchain.toolchains[name.to_s].setup(self)
     end
 
     def build_dir
-      #@build_dir ||= "build/#{name}"
       "build/#{self.name}"
     end
 
     def mrbcfile
-      @mrbcfile ||= exefile("build/host/bin/mrbc")
-    end
-
-    def compile_c(outfile, infile, flags=[], includes=[])
-      FileUtils.mkdir_p File.dirname(outfile)
-      flags = [cflags, gems.map { |g| g.mruby_cflags }, flags]
-      flags << [self.includes, gems.map { |g| g.mruby_includes }, includes].flatten.map { |f| "-I#{filename f}" }
-      sh "#{filename cc} #{flags.flatten.join(' ')} -o #{filename outfile} -c #{filename infile}"
-    end
-    
-    def compile_cxx(outfile, infile, flags=[], includes=[])
-      FileUtils.mkdir_p File.dirname(outfile)
-      flags = [cxxflags, gems.map { |g| g.mruby_cflags }, flags]
-      flags << [self.includes, gems.map { |g| g.mruby_includes }, includes].flatten.map { |f| "-I#{filename f}" }
-      sh "#{filename cxx} #{flags.flatten.join(' ')} -o #{filename outfile} -c #{filename infile}"
-    end
-    
-    def compile_objc(outfile, infile, flags=[], includes=[])
-      FileUtils.mkdir_p File.dirname(outfile)
-      flags = [objcflags, gems.map { |g| g.mruby_cflags }, flags]
-      flags << [self.includes, gems.map { |g| g.mruby_includes }, includes].flatten.map { |f| "-I#{filename f}" }
-      sh "#{filename objcc} #{flags.flatten.join(' ')} -o #{filename outfile} -c #{filename infile}"
-    end
-    
-    def compile_asm(outfile, infile, flags=[], includes=[])
-      FileUtils.mkdir_p File.dirname(outfile)
-      flags = [asmflags, gems.map { |g| g.mruby_cflags }, flags]
-      flags << [self.includes, gems.map { |g| g.mruby_includes }, includes].flatten.map { |f| "-I#{filename f}" }
-      sh "#{filename asm} #{flags.flatten.join(' ')} -o #{filename outfile} -c #{filename infile}"
-    end
-    
-    def compile_mruby(outfile, infiles, funcname)
-      cmd = "#{cat} #{filenames [infiles]} | #{filename mrbcfile} -B#{funcname}"
-      if outfile.is_a?(IO)
-        IO.popen("#{cmd} -o- -", 'r') do |f|
-          outfile.puts f.read
-        end
-      else
-        FileUtils.mkdir_p File.dirname(outfile)
-        sh "#{cmd} -o#{filename outfile} -"
-      end
-    end
-    
-    def link(outfile, objfiles, flags=[], libs=[])
-      FileUtils.mkdir_p File.dirname(outfile)
-      flags = [ldflags, flags]
-      libs = [libs, self.libs]
-      sh "#{filename ld} -o #{filename outfile} #{flags.join(' ')} #{filenames objfiles} #{libs.flatten.join(' ')}"
+      exefile("build/host/bin/mrbc")
     end
-    
-    def archive(outfile, options, objfiles)
-      FileUtils.mkdir_p File.dirname(outfile)
-      sh "#{filename ar} #{options} #{filename outfile} #{filenames objfiles}"
+
+    def compilers
+      COMPILERS.map do |c|
+        instance_variable_get("@#{c}")
+      end
     end
 
-    def run_yacc(outfile, infile)
-      FileUtils.mkdir_p File.dirname(outfile)
-      sh "#{filename yacc} -o #{filename outfile} #{filename infile}"
+    def filename(name)
+      if name.is_a?(Array)
+        name.map { |n| filename(n) }
+      else
+        '"%s"' % name.gsub('/', file_separator)
+      end
     end
 
-    def run_gperf(outfile, infile)
-      FileUtils.mkdir_p File.dirname(outfile)
-      sh %Q[#{filename gperf} -L ANSI-C -C -p -j1 -i 1 -g -o -t -N mrb_reserved_word -k"1,3,$" #{filename infile} > #{filename outfile}]
+    def exefile(name)
+      if name.is_a?(Array)
+        name.map { |n| exefile(n) }
+      else
+        "#{name}#{exts.executable}"
+      end
     end
 
-    def run_git_clone(gemdir, giturl, options=[])
-      sh "#{filename git} clone #{options.join(' ')} #{filename giturl} #{filename gemdir}"
+    def objfile(name)
+      if name.is_a?(Array)
+        name.map { |n| objfile(n) }
+      else
+        "#{name}#{exts.object}"
+      end
     end
 
+    def libfile(name)
+      if name.is_a?(Array)
+        name.map { |n| libfile(n) }
+      else
+        "#{name}#{exts.library}"
+      end
+    end
 
+    def run_test
+      puts ">>> Test #{name} <<<"
+      mrbtest = exefile("#{build_dir}/test/mrbtest")
+      sh "#{filename mrbtest}"
+      puts 
+    end
   end # Build
 
   class CrossBuild < Build
-    def initialize(name, &block)
-      @name ||= name
-      super(&block)
+    def run_test
+      mrbtest = exefile("#{build_dir}/test/mrbtest")
+      puts "You should run #{mrbtest} on target device."
+      puts 
     end
   end # CrossBuild
 end # MRuby
diff --git a/tasks/mruby_build_commands.rake b/tasks/mruby_build_commands.rake
new file mode 100644
index 000000000..023b23763
--- /dev/null
+++ b/tasks/mruby_build_commands.rake
@@ -0,0 +1,198 @@
+require 'forwardable'
+
+module MRuby
+  class Command
+    include Rake::DSL
+    extend Forwardable
+    def_delegators :@build, :filename, :objfile, :libfile, :exefile
+    attr_accessor :build, :command
+
+    def initialize(build)
+      @build = build
+    end
+
+    # clone is deep clone without @build
+    def clone
+      target = super
+      excepts = %w(@build)
+      instance_variables.each do |attr|
+        unless excepts.include?(attr.to_s)
+          val = Marshal::load(Marshal.dump(instance_variable_get(attr))) # deep clone
+          target.instance_variable_set(attr, val)
+        end
+      end
+      target
+    end
+
+    private
+    def _run(options, params={})
+      sh build.filename(command) + ' ' + ( options % params )
+    end
+  end
+ 
+  class Command::Compiler < Command
+    attr_accessor :flags, :include_paths, :defines, :source_exts
+    attr_accessor :compile_options, :option_define, :option_include_path, :out_ext
+
+    def initialize(build, source_exts=[])
+      super(build)
+      @command = ENV['CC'] || 'gcc'
+      @flags = [ENV['CFLAGS'] || []]
+      @source_exts = source_exts
+      @include_paths = ["#{build.root}/include"]
+      @defines = %w(DISABLE_GEMS)
+      @option_include_path = '-I%s'
+      @option_define = '-D%s'
+      @compile_options = "%{flags} -MMD -o %{outfile} -c %{infile}"
+    end
+    
+    def run(outfile, infile, _defineds=[], _include_paths=[], _flags=[])
+      FileUtils.mkdir_p File.dirname(outfile)
+      define_flags = [defines, _defineds].flatten.map{ |d| option_define % d }
+      include_path_flags = [include_paths, _include_paths, File.dirname(infile)].flatten.map{ |f| option_include_path % filename(f) }
+      _run compile_options, { :flags => (flags + define_flags + include_path_flags + _flags).join(' '), :infile => filename(infile), :outfile => filename(outfile) }
+    end
+
+    def define_rules(build_dir, source_dir='')
+      @out_ext = build.exts.object
+
+      generated_file_matcher = Regexp.new("^#{build_dir}/(.*)#{Regexp.escape out_ext}$")
+      source_exts.each do |ext, compile|
+        rule generated_file_matcher => [
+          proc { |file|
+            file.sub(generated_file_matcher, "#{source_dir}\\1#{ext}")
+          },
+          proc { |file|
+            get_dependencies(file)
+          }
+        ] do |t|
+          run t.name, t.prerequisites.first
+        end
+
+        rule generated_file_matcher => [
+          proc { |file|
+            file.sub(generated_file_matcher, "#{build_dir}/\\1#{ext}")
+          },
+          proc { |file|
+            get_dependencies(file)
+          }
+        ] do |t|
+          run t.name, t.prerequisites.first
+        end
+      end
+    end
+
+    private
+    def get_dependencies(file)
+      file = file.ext('d') unless File.extname(file) == '.d'
+      if File.exists?(file)
+        File.read(file).gsub("\\\n ", "").scan(/^\S+:\s+(.+)$/).flatten.map {|s| s.split(' ') }.flatten
+      else
+        []
+      end
+    end
+  end
+
+  class Command::Linker < Command
+    attr_accessor :flags, :libraries, :library_paths
+    attr_accessor :link_options, :option_library, :option_library_path
+
+    def initialize(build)
+      super
+      @command = ENV['LD'] || 'gcc'
+      @flags = (ENV['LDFLAGS'] || [])
+      @libraries = []
+      @library_paths = []
+      @option_library = '-l%s'
+      @option_library_path = '-L%s'
+      @link_options = "%{flags} -o %{outfile} %{objs} %{libs}"
+    end
+
+    def run(outfile, objfiles, _libraries=[], _library_paths=[], _flags=[])
+      FileUtils.mkdir_p File.dirname(outfile)
+      library_flags = [libraries, _libraries].flatten.reverse.map{ |d| option_library % d }
+      library_path_flags = [library_paths, _library_paths].flatten.map{ |f| option_library_path % filename(f) }
+      _run link_options, { :flags => (flags + library_path_flags + _flags).join(' '), :outfile => filename(outfile) , :objs => filename(objfiles).join(' '), :libs => library_flags.join(' ') }
+    end
+  end
+
+  class Command::Archiver < Command
+    attr_accessor :archive_options
+
+    def initialize(build)
+      super
+      @command = ENV['AR'] || 'ar'
+      @archive_options = 'rs %{outfile} %{objs}'
+    end
+
+    def run(outfile, objfiles)
+      FileUtils.mkdir_p File.dirname(outfile)
+      _run archive_options, { :outfile => filename(outfile), :objs => filename(objfiles).join(' ') }
+    end
+  end
+
+  class Command::Yacc < Command
+    attr_accessor :compile_options
+
+    def initialize(build)
+      super
+      @command = 'bison'
+      @compile_options = '-o %{outfile} %{infile}'
+    end
+
+    def run(outfile, infile)
+      FileUtils.mkdir_p File.dirname(outfile)
+      _run compile_options, { :outfile => filename(outfile) , :infile => filename(infile) }
+    end
+  end
+
+  class Command::Gperf < Command
+    attr_accessor :compile_options
+
+    def initialize(build)
+      super
+      @command = 'gperf'
+      @compile_options = '-L ANSI-C -C -p -j1 -i 1 -g -o -t -N mrb_reserved_word -k"1,3,$" %{infile} > %{outfile}'
+    end
+
+    def run(outfile, infile)
+      FileUtils.mkdir_p File.dirname(outfile)
+      _run compile_options, { :outfile => filename(outfile) , :infile => filename(infile) }
+    end
+  end
+
+  class Command::Git < Command
+    attr_accessor :flags
+    attr_accessor :clone_options
+
+    def initialize(build)
+      super
+      @command = 'git'
+      @flags = []
+      @clone_options = "clone %{flags} %{url} %{dir}"
+    end
+
+    def run_clone(dir, url, _flags = [])
+      _run clone_options, { :flags => [flags, _flags].flatten.join(' '), :url => url, :dir => filename(dir) }
+    end
+  end
+
+  class Command::Mrbc < Command
+    def initialize(build)
+      super
+      @command = nil
+      @compile_options = "-B%{funcname} -o- -"
+    end
+
+    def run(out, infiles, funcname)
+      @command ||= @build.mrbcfile
+      IO.popen("#{filename @command} #{@compile_options % {:funcname => funcname}}", 'r+') do |io|
+        [infiles].flatten.each do |f|
+          io.write IO.read(f)
+        end
+        io.close_write
+        out.puts io.read
+      end
+    end
+  end
+end
\ No newline at end of file
diff --git a/tasks/mruby_build_gem.rake b/tasks/mruby_build_gem.rake
new file mode 100644
index 000000000..ae0a79447
--- /dev/null
+++ b/tasks/mruby_build_gem.rake
@@ -0,0 +1,39 @@
+module MRuby
+  module LoadGems
+    def gem(gemdir, &block)
+      gemdir = load_external_gem(gemdir) if gemdir.is_a?(Hash)
+      load File.join(gemdir, "mrbgem.rake")
+      Gem.current.dir = gemdir
+      Gem.current.build = MRuby::Build.current
+      Gem.current.build_config_initializer = block
+      gems << Gem.current
+      Gem.current
+    end
+
+    def load_external_gem(params)
+      if params[:github]
+        params[:git] = "https://github.com/#{params[:github]}.git"
+      end
+
+      if params[:git]
+        url = params[:git]
+        gemdir = "build/mrbgems/#{url.match(/([-_\w]+)(\.[-_\w]+|)$/).to_a[1]}"
+        return gemdir if File.exists?(gemdir)
+
+        options = [params[:options]] || []
+        options << "--branch \"#{params[:branch]}\"" if params[:tag]
+
+        FileUtils.mkdir_p "build/mrbgems"
+        git.run_clone gemdir, url, options
+        
+        gemdir
+      else
+        fail "unknown gem option #{params}"
+      end
+    end
+
+    def enable_gems?
+      [email protected]?
+    end
+  end # LoadGems
+end # MRuby
diff --git a/tasks/mruby_gem_spec.rake b/tasks/mruby_gem_spec.rake
deleted file mode 100644
index c2479412e..000000000
--- a/tasks/mruby_gem_spec.rake
+++ /dev/null
@@ -1,160 +0,0 @@
-require 'pathname'
-
-module MRuby
-  module Gem
-    class << self
-      attr_accessor :processing_path
-    end
-
-    class Specification
-      include Rake::DSL
-
-      attr_reader :build
-      attr_accessor :name, :dir
-
-      def self.attr_array(*vars)
-        attr_reader *vars
-        vars.each do |v|
-          class_eval "def #{v}=(val);@#{v}||=[];@#{v}+=[val].flatten;end"
-        end
-      end
-
-      attr_array :licenses, :authors
-      alias :license= :licenses=
-      alias :author= :authors=
-      attr_array :cflags, :cxxflags, :objcflags, :asmflags
-      attr_array :mruby_cflags, :mruby_includes, :mruby_ldflags, :mruby_libs
-
-      attr_array :rbfiles, :objs
-      attr_array :test_objs, :test_rbfiles
-      attr_accessor :test_preload
-
-      def initialize(name, &block)
-        @name = name
-        @build = MRuby.build
-        @dir = Gem.processing_path
-        @cflags, @cxxflags, @objcflags, @asmflags = [], [], [], []
-        @mruby_cflags, @mruby_ldflags, @mruby_libs = [], [], []
-        @mruby_includes = ["#{dir}/include"]
-        @rbfiles = Dir.glob("#{dir}/mrblib/*.rb")
-        @objs = Dir.glob("#{dir}/src/*.{c,cpp,m,asm,S}").map { |f| f.relative_path_from(@dir).to_s.pathmap("#{build_dir}/%X.o") }
-        @test_rbfiles = Dir.glob("#{dir}/test/*.rb")
-        @test_objs = Dir.glob("#{dir}/test/*.{c,cpp,m,asm,S}").map { |f| f.relative_path_from(dir).to_s.pathmap("#{build_dir}/%X.o") }
-        @test_preload = 'test/assert.rb'
-
-        instance_eval(&block)
-
-        @objs << "#{build_dir}/gem_init.o"
-
-        if !name || !licenses || !authors
-          fail "#{name || dir} required to set name, license(s) and author(s)"
-        end
-
-        build.gems << self
-        build.libmruby << @objs
-
-        define_default_rules
-        add_tasks
-      end
-
-      def testlib
-        "#{build_dir}/libmrb-#{name}-gem-test.a"
-      end
-
-      def funcname
-        @funcname ||= @name.gsub('-', '_')
-      end
-
-      def build_dir
-        @build_dir ||= "#{build.build_dir}/mrbgems/#{name}"
-        FileUtils.mkdir_p @build_dir
-        @build_dir
-      end
-
-      def add_tasks
-        Rake::FileTask.define_task "#{build_dir}/gem_init.o" => "#{build_dir}/gem_init.c"
-        Rake::FileTask.define_task "#{build_dir}/gem_init.c" => [build.mrbcfile] + rbfiles do |t|
-          generate_gem_init("#{build_dir}/gem_init.c")
-        end
-      end
-
-      def define_default_rules
-        obj_matcher = Regexp.new("^#{build_dir}/(.*)\\.o$")
-        {
-          '.c' => proc { |t| build.compile_c t.name, t.prerequisites.first, cflags },
-          '.cpp' => proc { |t| build.compile_cxx t.name, t.prerequisites.first, cxxflags },
-          '.cxx' => proc { |t| build.compile_cxx t.name, t.prerequisites.first, cxxflags },
-          '.cc' => proc { |t| build.compile_cxx t.name, t.prerequisites.first, cxxflags },
-          '.m' => proc { |t| build.compile_objc t.name, t.prerequisites.first, objcflags },
-          '.S' => proc { |t| build.compile_asm t.name, t.prerequisites.first, asmflags }
-        }.each do |ext, compile|
-          rule obj_matcher => [
-            proc { |file|
-              file.sub(obj_matcher, "#{dir}/\\1#{ext}")
-            },
-            proc { |file|
-              get_dependencies(file)
-            }] do |t|
-            FileUtils.mkdir_p File.dirname(t.name)
-            compile.call t
-          end
-
-          rule obj_matcher => [
-            proc { |file|
-              file.sub(obj_matcher, "#{build_dir}/\\1#{ext}")
-            },
-            proc { |file|
-              get_dependencies(file)
-            }] do |t|
-            FileUtils.mkdir_p File.dirname(t.name)
-            compile.call t
-          end
-        end
-      end
-
-      def generate_gem_init(fname)
-        open(fname, 'w') do |f|
-          f.puts gem_init_header
-          build.compile_mruby f, rbfiles, "gem_mrblib_irep_#{funcname}" unless rbfiles.empty?
-          f.puts "void mrb_#{funcname}_gem_init(mrb_state *mrb);"
-          f.puts "void GENERATED_TMP_mrb_#{funcname}_gem_init(mrb_state *mrb) {"
-          f.puts "  int ai = mrb_gc_arena_save(mrb);"
-          f.puts "  mrb_#{funcname}_gem_init(mrb);" if objs != ["#{build_dir}/gem_init.o"]
-          f.puts <<__EOF__ unless rbfiles.empty?
-  mrb_load_irep(mrb, gem_mrblib_irep_#{funcname});
-  if (mrb->exc) {
-    mrb_p(mrb, mrb_obj_value(mrb->exc));
-    exit(0);
-  }
-
-__EOF__
-          f.puts "  mrb_gc_arena_restore(mrb, ai);"
-
-          f.puts "}"
-        end
-      end # generate_gem_init
-
-      def gem_init_header
-        <<__EOF__
-/*
- * This file is loading the irep
- * Ruby GEM code.
- *
- * IMPORTANT:
- *   This file was generated!
- *   All manual changes will get lost.
- */
-#include "mruby.h"
-#include "mruby/irep.h"
-#include "mruby/dump.h"
-#include "mruby/string.h"
-#include "mruby/proc.h"
-#include "mruby/variable.h"
-#include "mruby/array.h"
-#include "mruby/string.h"
-__EOF__
-      end # gem_init_header
-
-    end # Specification
-  end # Gem
-end # MRuby
diff --git a/tasks/ruby_ext.rake b/tasks/ruby_ext.rake
index 08633b4da..ebd499063 100644
--- a/tasks/ruby_ext.rake
+++ b/tasks/ruby_ext.rake
@@ -1,24 +1,35 @@
-def exefile(filename)
-  if ENV['OS'] == 'Windows_NT'
-    "#{filename}.exe"
-  else
-    filename
+class Object
+  class << self
+    def attr_block(*syms)
+      syms.flatten.each do |sym|
+        class_eval "def #{sym}(&block);block.call(@#{sym}) if block_given?;@#{sym};end"
+      end
+    end
   end
 end
 
-def filename(name)
-  if ENV['OS'] == 'Windows_NT'
-    '"'+name.gsub('/', '\\')+'"'
+class String
+  def relative_path_from(dir)
+    Pathname.new(File.expand_path(self)).relative_path_from(Pathname.new(File.expand_path(dir))).to_s
+  end
+  
+  # Compatible with 1.9 on 1.8
+  def %(params)
+    if params.is_a?(Hash)
+      str = self.clone
+      params.each do |k, v|
+        str.gsub!("%{#{k}}", v)
+      end
+      str
+    else
+      sprintf(self, params)
+    end
   end
-  '"'+name+'"'
-end
-
-def filenames(names)
-  [names].flatten.map { |n| filename(n) }.join(' ')
 end
 
-class String
-  def relative_path_from(dir)
-    Pathname.new(self).relative_path_from(Pathname.new(dir)).to_s
+class Symbol
+  # Compatible with 1.9 on 1.8
+  def to_proc
+    proc { |obj, *args| obj.send(self, *args) }
   end
 end
diff --git a/tasks/rules.rake b/tasks/rules.rake
deleted file mode 100644
index beda2a864..000000000
--- a/tasks/rules.rake
+++ /dev/null
@@ -1,43 +0,0 @@
-def get_dependencies(file)
-  file = file.ext('d') unless File.extname(file) == '.d'
-  if File.exists?(file)
-    File.read(file).gsub("\\\n ", "").scan(/^\S+:\s+(.+)$/).flatten.map {|s| s.split(' ') }.flatten
-  else
-    []
-  end
-end
-
-MRuby.each_target do |t|
-  obj_matcher = Regexp.new("^#{build_dir}/(.*)\\.o$")
-  {
-    '.c' => proc { |t| compile_c t.name, t.prerequisites.first },
-    '.cpp' => proc { |t| compile_cxx t.name, t.prerequisites.first },
-    '.cxx' => proc { |t| compile_cxx t.name, t.prerequisites.first },
-    '.cc' => proc { |t| compile_cxx t.name, t.prerequisites.first },
-    '.m' => proc { |t| compile_objc t.name, t.prerequisites.first },
-    '.S' => proc { |t| compile_asm t.name, t.prerequisites.first }
-  }.each do |ext, compile|
-    rule obj_matcher => [
-      proc { |file|
-        file.sub(obj_matcher, "\\1#{ext}")
-      },
-      proc { |file|
-        get_dependencies(file)
-      }] do |t|
-      FileUtils.mkdir_p File.dirname(t.name)
-      compile.call t
-    end
-
-    rule obj_matcher => [
-      proc { |file|
-        file.sub(obj_matcher, "#{build_dir}/\\1#{ext}")
-      },
-      proc { |file|
-        get_dependencies(file)
-      }] do |t|
-      FileUtils.mkdir_p File.dirname(t.name)
-      compile.call t
-    end
-  end
-end
-
diff --git a/tasks/toolchains/clang.rake b/tasks/toolchains/clang.rake
new file mode 100644
index 000000000..01dd5f234
--- /dev/null
+++ b/tasks/toolchains/clang.rake
@@ -0,0 +1,6 @@
+MRuby::Toolchain.new(:clang) do |conf|
+  toolchain :gcc
+
+  conf.cc.command = ENV['CC'] || 'clang'
+  conf.linker.command = ENV['LD'] || 'clang'
+end
diff --git a/tasks/toolchains/gcc.rake b/tasks/toolchains/gcc.rake
new file mode 100644
index 000000000..c624c8fc9
--- /dev/null
+++ b/tasks/toolchains/gcc.rake
@@ -0,0 +1,21 @@
+MRuby::Toolchain.new(:gcc) do |conf|
+  conf.cc do |cc|
+    cc.command = ENV['CC'] || 'gcc'
+    cc.flags = [ENV['CFLAGS'] || %w(-g -O3 -Wall -Werror-implicit-function-declaration)]
+    cc.include_paths = ["#{root}/include"]
+    cc.defines = %w(DISABLE_GEMS)
+    cc.option_include_path = '-I%s'
+    cc.option_define = '-D%s'
+    cc.compile_options = '%{flags} -MMD -o %{outfile} -c %{infile}'
+  end
+
+  conf.linker do |linker|
+    linker.command = ENV['LD'] || 'gcc'
+    linker.flags = [ENV['LDFLAGS'] || %w()]
+    linker.libraries = %w(m)
+    linker.library_paths = []
+    linker.option_library = '-l%s'
+    linker.option_library_path = '-L%s'
+    linker.link_options = '%{flags} -o %{outfile} %{objs} %{libs}'
+  end
+end
diff --git a/tasks/toolchains/vs2012.rake b/tasks/toolchains/vs2012.rake
new file mode 100644
index 000000000..8b4212468
--- /dev/null
+++ b/tasks/toolchains/vs2012.rake
@@ -0,0 +1,44 @@
+MRuby::Toolchain.new(:vs2012) do |conf|
+  conf.cc do |cc|
+    cc.command = ENV['CC'] || 'cl.exe'
+    cc.flags = [ENV['CFLAGS'] || %w(/c /nologo /W3 /D_DEBUG /MDd /Zi /Od /RTC1 /DDISABLE_GEMS /DHAVE_STRING_H /DNO_GETTIMEOFDAY /D_CRT_SECURE_NO_WARNINGS)]
+    cc.include_paths = ["#{root}/include"]
+    cc.defines = %w(DISABLE_GEMS)
+    cc.option_include_path = '-I%s'
+    cc.option_define = '-D%s'
+    cc.compile_options = "%{flags} /Fo%{outfile} -c %{infile}"
+  end
+
+  conf.linker do |linker|
+    linker.command = ENV['LD'] || 'link.exe'
+    linker.flags = [ENV['LDFLAGS'] || %w(/nologo)]
+    linkerraries = %w(kernel32 user32 gdi32 winspool comdlg32 advapi32 shell32 ole32 oleaut32 uuid odbc32 odbccp32)
+    linkerrary_paths = []
+    linker.option_library = '-l%s'
+    linker.option_library_path = '-L%s'
+    linker.link_options = "%{flags} /OUT:%{outfile} %{objs} %{libs}"
+  end
+ 
+  conf.archiver do |archiver|
+    archiver.command = ENV['AR'] || 'lib.exe'
+    archiver.archive_options = '/OUT:%{outfile} %{objs}'
+  end
+ 
+  conf.yacc do |yacc|
+    yacc.command = ENV['YACC'] || 'bison.exe'
+    yacc.compile_options = '-o %{outfile} %{infile}'
+  end
+ 
+  conf.gperf do |gperf|
+    gperf.command = 'gperf.exe'
+    gperf.compile_options = '-L ANSI-C -C -p -j1 -i 1 -g -o -t -N mrb_reserved_word -k"1,3,$" %{infile} > %{outfile}'
+  end
+
+  conf.exts do |exts|
+    exts.object = '.obj'
+    exts.executable = '.exe'
+    exts.library = '.lib'
+  end
+
+  conf.file_separator = '\\'
+end
diff --git a/test/mrbtest.rake b/test/mrbtest.rake
index 33f283fc9..591b737cd 100644
--- a/test/mrbtest.rake
+++ b/test/mrbtest.rake
@@ -1,32 +1,35 @@
-dir = File.dirname(__FILE__).sub(%r|^\./|, '')
-
 MRuby.each_target do
+  dir = File.dirname(__FILE__).relative_path_from(root)
+
   exec = exefile("#{build_dir}/#{dir}/mrbtest")
   clib = "#{build_dir}/#{dir}/mrbtest.c"
-  mlib = clib.ext('o')
+  mlib = clib.ext(exts.object)
   mrbs = Dir.glob("#{dir}/t/*.rb")
   init = "#{dir}/init_mrbtest.c"
   asslib = "#{dir}/assert.rb"
 
-  objs = ["#{build_dir}/#{dir}/driver.o", mlib]
+  objs = [objfile("#{build_dir}/#{dir}/driver"), mlib]
 
-  file exec => objs + gems.map{ |g| g.testlib } + ["#{build_dir}/lib/libmruby.a"] do |t|
-    link t.name, t.prerequisites, gems.map { |g| g.mruby_ldflags }, gems.map { |g| g.mruby_libs }
+  file exec => objs + gems.map(&:testlib) + [libfile("#{build_dir}/lib/libmruby")] do |t|
+    gem_flags = gems.map { |g| g.linker.flags }
+    gem_libraries = gems.map { |g| g.linker.libraries }
+    gem_library_paths = gems.map { |g| g.linker.library_paths }
+    linker.run t.name, t.prerequisites, gem_libraries, gem_library_paths, gem_flags
   end
 
   file mlib => [clib]
   file clib => [mrbcfile, init, asslib] + mrbs do |t|
     open(clib, 'w') do |f|
-      f.puts File.read(init)
-      compile_mruby f, [asslib] + mrbs, 'mrbtest_irep'
+      f.puts IO.read(init)
+      mrbc.run f, [asslib] + mrbs, 'mrbtest_irep'
       gems.each do |g|
-        f.puts "void GENERATED_TMP_mrb_#{g.funcname}_gem_test(mrb_state *mrb);"
+        f.puts %Q[void GENERATED_TMP_mrb_#{g.funcname}_gem_test(mrb_state *mrb);]
       end
-      f.puts "void mrbgemtest_init(mrb_state* mrb) {"
+      f.puts %Q[void mrbgemtest_init(mrb_state* mrb) {]
       gems.each do |g|
-        f.puts "    GENERATED_TMP_mrb_#{g.funcname}_gem_test(mrb);"
+        f.puts %Q[    GENERATED_TMP_mrb_#{g.funcname}_gem_test(mrb);]
       end
-      f.puts "}"
+      f.puts %Q[}]
     end
   end
 end
diff --git a/tools/mirb/mirb.rake b/tools/mirb/mirb.rake
index 958ebe79a..9f41fff64 100644
--- a/tools/mirb/mirb.rake
+++ b/tools/mirb/mirb.rake
@@ -1,12 +1,15 @@
-dir = File.dirname(__FILE__).sub(%r|^\./|, '')
-
 MRuby.each_target do
-  if bins.select { |s| s.to_s == 'mirb' }
+  dir = File.dirname(__FILE__).relative_path_from(root)
+
+  if bins.find { |s| s.to_s == 'mirb' }
     exec = exefile("#{build_dir}/bin/mirb")
-    objs = Dir.glob("#{dir}/*.{c}").map { |f| f.pathmap("#{build_dir}/%X.o") }
+    objs = Dir.glob("#{dir}/*.c").map { |f| objfile(f.pathmap("#{build_dir}/%X")) }
 
-    file exec => objs + ["#{build_dir}/lib/libmruby.a"] do |t|
-      link t.name, t.prerequisites, gems.map { |g| g.mruby_ldflags }, gems.map { |g| g.mruby_libs }
+    file exec => objs + [libfile("#{build_dir}/lib/libmruby")] do |t|
+      gem_flags = gems.map { |g| g.linker.flags }
+      gem_libraries = gems.map { |g| g.linker.libraries }
+      gem_library_paths = gems.map { |g| g.linker.library_paths }
+      linker.run t.name, t.prerequisites, gem_libraries, gem_library_paths, gem_flags
     end
   end
 end
diff --git a/tools/mrbc/mrbc.rake b/tools/mrbc/mrbc.rake
index 74e04bed5..248433cf0 100644
--- a/tools/mrbc/mrbc.rake
+++ b/tools/mrbc/mrbc.rake
@@ -1,12 +1,12 @@
-dir = File.dirname(__FILE__).sub(%r|^\./|, '')
-
 MRuby.each_target do
-  if bins.select { |s| s.to_s == 'mrbc' }
+  dir = File.dirname(__FILE__).relative_path_from(root)
+
+  if bins.find { |s| s.to_s == 'mrbc' }
     exec = exefile("#{build_dir}/bin/mrbc")
-    objs = Dir.glob("#{dir}/*.{c}").map { |f| f.pathmap("#{build_dir}/%X.o") }
+    objs = Dir.glob("#{dir}/*.c").map { |f| objfile(f.pathmap("#{build_dir}/%X")) }
 
-    file exec => objs + ["#{build_dir}/lib/libmruby_core.a"] do |t|
-      link t.name, t.prerequisites
+    file exec => objs + [libfile("#{build_dir}/lib/libmruby_core")] do |t|
+      linker.run t.name, t.prerequisites
     end
   end
 end
diff --git a/tools/mruby/mruby.rake b/tools/mruby/mruby.rake
index 7842c4266..d380cb9f5 100644
--- a/tools/mruby/mruby.rake
+++ b/tools/mruby/mruby.rake
@@ -1,12 +1,15 @@
-dir = File.dirname(__FILE__).sub(%r|^\./|, '')
-
 MRuby.each_target do
-  if bins.select { |s| s.to_s == 'mruby' }
+  dir = File.dirname(__FILE__).relative_path_from(root)
+
+  if bins.find { |s| s.to_s == 'mruby' }
     exec = exefile("#{build_dir}/bin/mruby")
-    objs = Dir.glob("#{dir}/*.{c}").map { |f| f.pathmap("#{build_dir}/%X.o") }
+    objs = Dir.glob("#{dir}/*.c").map { |f| objfile(f.pathmap("#{build_dir}/%X")) }
 
-    file exec => objs + ["#{build_dir}/lib/libmruby.a"] do |t|
-      link t.name, t.prerequisites, gems.map { |g| g.mruby_ldflags }, gems.map { |g| g.mruby_libs }
+    file exec => objs + [libfile("#{build_dir}/lib/libmruby")] do |t|
+      gem_flags = gems.map { |g| g.linker.flags }
+      gem_libraries = gems.map { |g| g.linker.libraries }
+      gem_library_paths = gems.map { |g| g.linker.library_paths }
+      linker.run t.name, t.prerequisites, gem_libraries, gem_library_paths, gem_flags
     end
   end
 end