support 'Cygwin' as build platform.

Rakefile

@@ -2,6 +2,7 @@
 # Build description.
 # basic build file for mruby
 MRUBY_ROOT = File.dirname(File.expand_path(__FILE__))
+MRUBY_BUILD_HOST_IS_CYGWIN = RUBY_PLATFORM.include?('cygwin')
 
 # load build systems
 load "#{MRUBY_ROOT}/tasks/ruby_ext.rake"

tasks/mruby_build.rake

@@ -128,6 +128,14 @@ module MRuby
       end
     end
 
+    def cygwin_filename(name)
+      if name.is_a?(Array)
+        name.flatten.map { |n| cyg_filename(n) }
+      else
+        '"%s"' % `cygpath -w "#{filename(name)}"`.strip
+      end
+    end
+
     def exefile(name)
       if name.is_a?(Array)
         name.flatten.map { |n| exefile(n) }

tasks/mruby_build_commands.rake

@@ -4,7 +4,7 @@ module MRuby
   class Command
     include Rake::DSL
     extend Forwardable
-    def_delegators :@build, :filename, :objfile, :libfile, :exefile
+    def_delegators :@build, :filename, :objfile, :libfile, :exefile, :cygwin_filename
     attr_accessor :build, :command
 
     def initialize(build)
@@ -49,8 +49,12 @@ module MRuby
     def all_flags(_defineds=[], _include_paths=[], _flags=[])
       define_flags = [defines, _defineds].flatten.map{ |d| option_define % d }
       include_path_flags = [include_paths, _include_paths].flatten.map do |f|
+        if MRUBY_BUILD_HOST_IS_CYGWIN
+          option_include_path % cygwin_filename(f)
+        else
           option_include_path % filename(f)
         end
+      end
       [flags, define_flags, include_path_flags, _flags].flatten.join(' ')
     end
     
@@ -61,9 +65,14 @@ module MRuby
         option_include_path % filename(f)
       end
       _pp "CC", infile.relative_path, outfile.relative_path
+      if MRUBY_BUILD_HOST_IS_CYGWIN
+        _run compile_options, { :flags => all_flags(_defineds, _include_paths, _flags),
+                                :infile => cygwin_filename(infile), :outfile => cygwin_filename(outfile) }
+      else
         _run compile_options, { :flags => all_flags(_defineds, _include_paths, _flags),
                                 :infile => filename(infile), :outfile => filename(outfile) }
       end
+    end
 
     def define_rules(build_dir, source_dir='')
       @out_ext = build.exts.object
@@ -127,8 +136,12 @@ module MRuby
 
     def all_flags(_library_paths=[], _flags=[])
       library_path_flags = [library_paths, _library_paths].flatten.map do |f|
+        if MRUBY_BUILD_HOST_IS_CYGWIN
+          option_library_path % cygwin_filename(f)
+        else
           option_library_path % filename(f)
         end
+      end
       [flags, library_path_flags, _flags].flatten.join(' ')
     end
 
@@ -142,6 +155,13 @@ module MRuby
       library_path_flags = [library_paths, _library_paths].flatten.map { |f| option_library_path % filename(f) }
 
       _pp "LD", outfile.relative_path
+      if MRUBY_BUILD_HOST_IS_CYGWIN
+        _run link_options, { :flags => all_flags(_library_paths, _flags),
+                             :outfile => cygwin_filename(outfile) , :objs => cygwin_filename(objfiles).join(' '),
+                             :flags_before_libraries => [flags_before_libraries, _flags_before_libraries].flatten.join(' '),
+                             :flags_after_libraries => [flags_after_libraries, _flags_after_libraries].flatten.join(' '),
+                             :libs => library_flags.join(' ') }
+      else
         _run link_options, { :flags => all_flags(_library_paths, _flags),
                              :outfile => filename(outfile) , :objs => filename(objfiles).join(' '),
                              :flags_before_libraries => [flags_before_libraries, _flags_before_libraries].flatten.join(' '),
@@ -149,6 +169,7 @@ module MRuby
                              :libs => library_flags.join(' ') }
       end
     end
+  end
 
   class Command::Archiver < Command
     attr_accessor :archive_options
@@ -162,9 +183,13 @@ module MRuby
     def run(outfile, objfiles)
       FileUtils.mkdir_p File.dirname(outfile)
       _pp "AR", outfile.relative_path
+      if MRUBY_BUILD_HOST_IS_CYGWIN
+        _run archive_options, { :outfile => cygwin_filename(outfile), :objs => cygwin_filename(objfiles).join(' ') }
+      else
         _run archive_options, { :outfile => filename(outfile), :objs => filename(objfiles).join(' ') }
       end
     end
+  end
 
   class Command::Yacc < Command
     attr_accessor :compile_options