Compile mruby compiler as mrbgem.

Compiler codes is moved to "mruby-compiler".
Executable `mrbc` is moved to "mruby-bin-mrbc".

Rakefile

@@ -21,7 +21,6 @@ end
 # load custom rules
 load "#{MRUBY_ROOT}/src/mruby_core.rake"
 load "#{MRUBY_ROOT}/mrblib/mrblib.rake"
-load "#{MRUBY_ROOT}/tools/mrbc/mrbc.rake"
 
 load "#{MRUBY_ROOT}/tasks/mrbgems.rake"
 load "#{MRUBY_ROOT}/tasks/libmruby.rake"

mrbgems/mruby-bin-mrbc/mrbgem.rake

@@ -0,0 +1,16 @@
+MRuby::Gem::Specification.new 'mruby-bin-mrbc' do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'mruby developers'
+  spec.summary = 'mruby compiler executable'
+
+  spec.add_dependency 'mruby-compiler', :core => 'mruby-compiler'
+
+  exec = exefile("#{build.build_dir}/bin/mrbc")
+  mrbc_objs = Dir.glob("#{spec.dir}/tools/mrbc/*.c").map { |f| objfile(f.pathmap("#{spec.build_dir}/tools/mrbc/%n")) }.flatten
+
+  file exec => mrbc_objs + [libfile("#{build.build_dir}/lib/libmruby_core")] do |t|
+    build.linker.run t.name, t.prerequisites
+  end
+
+  build.bins << 'mrbc' unless build.bins.find { |v| v == 'mrbc' }
+end

mrbgems/mruby-compiler/mrbgem.rake

@@ -0,0 +1,40 @@
+MRuby::Gem::Specification.new 'mruby-compiler' do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'mruby developers'
+  spec.summary = 'mruby compiler library'
+
+  current_dir = spec.dir
+  current_build_dir = spec.build_dir
+
+  lex_def = "#{current_dir}/core/lex.def"
+  core_objs = Dir.glob("#{current_dir}/core/*.c").map { |f|
+    next nil if build.cxx_abi_enabled? and f =~ /(codegen).c$/
+    objfile(f.pathmap("#{current_build_dir}/core/%n"))
+  }.compact
+
+  if build.cxx_abi_enabled?
+    core_objs <<
+      build.compile_as_cxx("#{current_build_dir}/core/y.tab.c", "#{current_build_dir}/core/y.tab.cxx",
+                           objfile("#{current_build_dir}/y.tab"), ["#{current_dir}/core"]) <<
+      build.compile_as_cxx("#{current_dir}/core/codegen.c", "#{current_build_dir}/core/codegen.cxx")
+  else
+    core_objs << objfile("#{current_build_dir}/core/y.tab")
+    file objfile("#{current_build_dir}/core/y.tab") => "#{current_build_dir}/core/y.tab.c" do |t|
+      cc.run t.name, t.prerequisites.first, [], ["#{current_dir}/core"]
+    end
+  end
+  file objfile("#{current_build_dir}/core/y.tab") => lex_def
+
+  # Parser
+  file "#{current_build_dir}/core/y.tab.c" => ["#{current_dir}/core/parse.y"] do |t|
+    yacc.run t.name, t.prerequisites.first
+  end
+
+  # Lexical analyzer
+  file lex_def => "#{current_dir}/core/keywords" do |t|
+    gperf.run t.name, t.prerequisites.first
+  end
+
+  file libfile("#{build.build_dir}/lib/libmruby_core") => core_objs
+  build.libmruby << core_objs
+end

mrbgems/mruby-eval/mrbgem.rake

@@ -2,4 +2,6 @@ MRuby::Gem::Specification.new('mruby-eval') do |spec|
   spec.license = 'MIT'
   spec.author  = 'mruby developers'
   spec.summary = 'standard Kernel#eval method'
+
+  add_dependency 'mruby-compiler', :core => 'mruby-compiler'
 end

src/mruby_core.rake

@@ -3,76 +3,17 @@ MRuby.each_target do
   relative_from_root = File.dirname(__FILE__).relative_path_from(MRUBY_ROOT)
   current_build_dir = "#{build_dir}/#{relative_from_root}"
 
-  lex_def = "#{current_dir}/lex.def"
   objs = Dir.glob("#{current_dir}/*.c").map { |f|
-    next nil if cxx_abi_enabled? and f =~ /(codegen|error|vm).c$/
+    next nil if cxx_abi_enabled? and f =~ /(error|vm).c$/
     objfile(f.pathmap("#{current_build_dir}/%n"))
   }.compact
 
   if cxx_abi_enabled?
-    cxx_abi_dependency = %w(codegen error vm)
-    cxx_abi_objs = cxx_abi_dependency.map { |v|
-      src = "#{current_build_dir}/#{v}.cxx"
-      file src => ["#{current_dir}/#{v}.c", __FILE__] do |t|
-        File.open(t.name, 'w') do |f|
-          f.write <<EOS
-#define __STDC_CONSTANT_MACROS
-#define __STDC_LIMIT_MACROS
-
-extern "C" {
-#include "#{MRUBY_ROOT}/#{t.prerequisites.first}"
-}
-
-
-#{v == 'error'? 'mrb_int mrb_jmpbuf::jmpbuf_id = 0;' : ''}
-EOS
-        end
-      end
-
-      file objfile(src) => src do |t|
-        cxx.run t.name, t.prerequisites.first, [], [current_dir]
-      end
-
-      objfile src
-    }
-    cxx_abi_objs << objfile("#{current_build_dir}/y.tab")
-
-    file "#{current_build_dir}/y.tab.cxx" => ["#{current_build_dir}/y.tab.c", __FILE__] do |t|
-      File.open(t.name, 'w') do |f|
-        f.write <<EOS
-#define __STDC_CONSTANT_MACROS
-#define __STDC_LIMIT_MACROS
-
-extern "C" {
-#include "#{t.prerequisites.first}"
-}
-EOS
-      end
-    end
-    file objfile("#{current_build_dir}/y.tab") => ["#{current_build_dir}/y.tab.cxx", lex_def] do |t|
-      cxx.run t.name, t.prerequisites.first, [], [current_dir]
-    end
-
-    objs += cxx_abi_objs
-  else
-    objs += [objfile("#{current_build_dir}/y.tab")]
-    file objfile("#{current_build_dir}/y.tab") => ["#{current_build_dir}/y.tab.c", lex_def] do |t|
-      cc.run t.name, t.prerequisites.first, [], [current_dir]
-    end
+    objs += %w(vm error).map { |v| compile_as_cxx "#{current_dir}/#{v}.c", "#{current_build_dir}/#{v}.cxx" }
   end
   self.libmruby << objs
 
   file libfile("#{build_dir}/lib/libmruby_core") => objs do |t|
     archiver.run t.name, t.prerequisites
   end
-
-  # Parser
-  file "#{current_build_dir}/y.tab.c" => ["#{current_dir}/parse.y"] do |t|
-    yacc.run t.name, t.prerequisites.first
-  end
-
-  # Lexical analyzer
-  file lex_def => "#{current_dir}/keywords" do |t|
-    gperf.run t.name, t.prerequisites.first
-  end
 end

tasks/mruby_build.rake

@@ -80,7 +80,7 @@ module MRuby
         @git = Command::Git.new(self)
         @mrbc = Command::Mrbc.new(self)
 
-        @bins = %w(mrbc)
+        @bins = []
         @gems, @libmruby = MRuby::Gem::List.new, []
         @build_mrbtest_lib_only = false
         @cxx_abi_enabled = false
@@ -92,6 +92,8 @@ module MRuby
 
       MRuby::Build.current = MRuby.targets[@name]
       MRuby.targets[@name].instance_eval(&block)
+
+      build_mrbc_exec if name == 'host'
     end
 
     def enable_debug
@@ -119,6 +121,33 @@ module MRuby
       @cxx_abi_enabled = true
     end
 
+    def compile_as_cxx src, cxx_src, obj = nil, includes = []
+      src = File.absolute_path src
+      cxx_src = File.absolute_path cxx_src
+      obj = objfile(cxx_src) if obj.nil?
+
+      file cxx_src => [src, __FILE__] do |t|
+        File.open(t.name, 'w') do |f|
+          f.write <<EOS
+#define __STDC_CONSTANT_MACROS
+#define __STDC_LIMIT_MACROS
+
+extern "C" {
+#include "#{src}"
+}
+
+#{File.basename(src) == 'error.c'? 'mrb_int mrb_jmpbuf::jmpbuf_id = 0;' : ''}
+EOS
+        end
+      end
+
+      file obj => cxx_src do |t|
+        cxx.run t.name, t.prerequisites.first, [], ["#{MRUBY_ROOT}/src"] + includes
+      end
+
+      obj
+    end
+
     def enable_bintest
       @enable_bintest = true
     end
@@ -142,8 +171,16 @@ module MRuby
       MRUBY_ROOT
     end
 
+    def build_mrbc_exec
+      gem :core => 'mruby-bin-mrbc'
+    end
+
     def mrbcfile
-      MRuby.targets[@name].exefile("#{MRuby.targets[@name].build_dir}/bin/mrbc")
+      return @mrbcfile if @mrbcfile
+
+      mrbc_build = MRuby.targets['host']
+      gems.each { |v| mrbc_build = self if v.name == 'mruby-bin-mrbc' }
+      @mrbcfile = mrbc_build.exefile("#{mrbc_build.build_dir}/bin/mrbc")
     end
 
     def compilers

tools/mrbc/mrbc.rake

@@ -1,14 +0,0 @@
-MRuby.each_target do
-  current_dir = File.dirname(__FILE__).relative_path_from(Dir.pwd)
-  relative_from_root = File.dirname(__FILE__).relative_path_from(MRUBY_ROOT)
-  current_build_dir = "#{build_dir}/#{relative_from_root}"
-
-  if bins.find { |s| s.to_s == 'mrbc' }
-    exec = exefile("#{build_dir}/bin/mrbc")
-    objs = Dir.glob("#{current_dir}/*.c").map { |f| objfile(f.pathmap("#{current_build_dir}/%n")) }.flatten
-
-    file exec => objs + [libfile("#{build_dir}/lib/libmruby_core")] do |t|
-      linker.run t.name, t.prerequisites
-    end
-  end
-end

travis_config.rb

@@ -8,6 +8,8 @@ MRuby::Build.new('debug') do |conf|
   conf.compilers.each do |c|
     c.defines += %w(MRB_GC_STRESS MRB_GC_FIXED_ARENA)
   end
+
+  build_mrbc_exec
 end
 
 MRuby::Build.new do |conf|
@@ -33,4 +35,6 @@ MRuby::Build.new('cxx_abi') do |conf|
   conf.enable_bintest
 
   enable_cxx_abi
+
+  build_mrbc_exec
 end