Add mruby debugger (mrdb)

AUTHORS

@@ -20,3 +20,14 @@ Original Authors "mruby developers" are:
    Tatsuhiko Kubo
    Takeshi Watanabe
    Yuki Kurihara
+   specified non-profit corporation mruby Forum
+   Kazuaki Tanaka
+   Hiromasa Ishii
+   Hiroshi Mimaki
+   Satoshi Odawara
+   Mitsubishi Electric Micro-Computer Application Software Co.,Ltd.
+   Hiroyuki Matsuzaki
+   Yuhei Okazaki
+   Manycolors, Inc.
+   Shota Nakano
+   Yuichi Osawa

Rakefile

@@ -75,6 +75,16 @@ MRuby.each_target do |target|
           FileUtils.cp t.prerequisites.first, t.name, { :verbose => $verbose }
         end
         depfiles += [ install_path ]
+      elsif target == MRuby.targets['host-debug']
+        unless MRuby.targets['host'].gems.map {|g| g.bins}.include?([bin])
+          install_path = MRuby.targets['host-debug'].exefile("#{MRUBY_ROOT}/bin/#{bin}")
+
+          file install_path => exec do |t|
+            FileUtils.rm_f t.name, { :verbose => $verbose }
+            FileUtils.cp t.prerequisites.first, t.name, { :verbose => $verbose }
+          end
+          depfiles += [ install_path ]
+        end
       else
         depfiles += [ exec ]
       end

build_config.rb

@@ -83,6 +83,31 @@
   # conf.enable_bintest
 end
 
+MRuby::Build.new('host-debug') do |conf|
+  # load specific toolchain settings
+
+  # Gets set by the VS command prompts.
+  if ENV['VisualStudioVersion'] || ENV['VSINSTALLDIR']
+    toolchain :visualcpp
+  else
+    toolchain :gcc
+  end
+
+  enable_debug
+
+  # include the default GEMs
+  conf.gembox 'default'
+
+  # C compiler settings
+  conf.cc.defines = %w(ENABLE_DEBUG)
+
+  # Generate mruby debugger command (require mruby-eval)
+  conf.gem :core => "mruby-bin-debugger"
+
+  # bintest
+  # conf.enable_bintest
+end
+
 # Define cross build settings
 # MRuby::CrossBuild.new('32bit') do |conf|
 #   toolchain :gcc