merge master

20 files changed, 172 insertions, 126 deletions

diff --git a/Rakefile b/Rakefile
index f0991d323..7d8dd4117 100644
--- a/Rakefile
+++ b/Rakefile
@@ -42,7 +42,14 @@ depfiles += MRuby.targets.reject { |n, t| n == 'host' }.map { |n, t|
 }.flatten
 
 desc "build all targets, install (locally) in-repo"
-task :all => depfiles
+task :all => depfiles do
+  puts
+  puts "Build summary:"
+  puts
+  MRuby.each_target do
+    print_build_summary
+  end
+end
 
 desc "run all mruby tests"
 task :test => MRuby.targets.values.map { |t| t.exefile("#{t.build_dir}/test/mrbtest") } do
diff --git a/doc/mrbgems/README.md b/doc/mrbgems/README.md
index 9e930d8b2..0af3192f4 100644
--- a/doc/mrbgems/README.md
+++ b/doc/mrbgems/README.md
@@ -11,44 +11,34 @@ extension integrated.
 
 To add a GEM into the build_config.rb add the following line for example:
 
-```
-conf.gem '/path/to/your/gem/dir'
-```
+	conf.gem '/path/to/your/gem/dir'
 
 You can also use a relative path which would be relative from the mruby root:
 
-```
-conf.gem 'doc/mrbgems/ruby_extension_example'
-```
+	conf.gem 'doc/mrbgems/ruby_extension_example'
 
 A remote GIT repository location for a GEM is also supported:
 
-```
-conf.gem :git => 'https://github.com/masuidrive/mrbgems-example.git', :branch => 'master'
-```
+	conf.gem :git => 'https://github.com/masuidrive/mrbgems-example.git', :branch => 'master'
 
-```
-conf.gem :github => 'masuidrive/mrbgems-example', :branch => 'master'
-```
+	conf.gem :github => 'masuidrive/mrbgems-example', :branch => 'master'
 
 
 ## GEM Structure
 
 The maximal GEM structure looks like this:
 
-```
-+- GEM_NAME         <- Name of GEM
-   |
-   +- mrblib/       <- Source for Ruby extension
-   |
-   +- src/          <- Source for C extension
-   |
-   +- test/         <- Test code (Ruby)
-   |
-   +- mrbgem.rake   <- GEM Specification
-   |
-   +- README.md     <- Readme for GEM
-```
+	+- GEM_NAME         <- Name of GEM
+	   |
+	   +- mrblib/       <- Source for Ruby extension
+	   |
+	   +- src/          <- Source for C extension
+	   |
+	   +- test/         <- Test code (Ruby)
+	   |
+	   +- mrbgem.rake   <- GEM Specification
+	   |
+	   +- README.md     <- Readme for GEM
 
 The folder *mrblib* contains pure Ruby files to extend mruby. The folder *src*
 contains C files to extend mruby. The folder *test* contains C and pure Ruby files
@@ -61,12 +51,10 @@ of your GEM.
 mrbgems expects a specifcation file called *mrbgem.rake* inside of your
 GEM direcotry. A typical GEM specification could look like this for example:
 
-```
-MRuby::Gem::Specification.new('c_and_ruby_extension_example') do |spec|
-  spec.license = 'MIT'
-  spec.authors = 'mruby developers'
-end
-```
+	MRuby::Gem::Specification.new('c_and_ruby_extension_example') do |spec|
+	  spec.license = 'MIT'
+	  spec.authors = 'mruby developers'
+	end
 
 The mrbgems build process will use this specification to compile Object and Ruby
 files. The compilation results will be add to *lib/libmruby.a*. This file is used
@@ -98,31 +86,42 @@ mrbgems expects that you have implemented a C method called
 by the name of your GEM. If you call your GEM *c_extension_example*, your
 initialisation method could look like this:
 
+	void
+	mrb_c_extension_example_gem_init(mrb_state* mrb) {
+	  struct RClass *class_cextension = mrb_define_module(mrb, "CExtension");
+	  mrb_define_class_method(mrb, class_cextension, "c_method", mrb_c_method, ARGS_NONE());
+	}
+
+### Finalize
+
+mrbgems expects that you have implemented a C method called
+```mrb_YOURGEMNAME_gem_final(mrb_state)```. ```YOURGEMNAME``` will be replaced
+by the name of your GEM. If you call your GEM *c_extension_example*, your
+finalizer method could look like this:
+
 ```
 void
-mrb_c_extension_example_gem_init(mrb_state* mrb) {
-  struct RClass *class_cextension = mrb_define_module(mrb, "CExtension");
-  mrb_define_class_method(mrb, class_cextension, "c_method", mrb_c_method, ARGS_NONE());
+mrb_c_extension_example_gem_final(mrb_state* mrb) {
+   free(someone);
 }
 ```
 
+
 ### Example
 
-```
-+- c_extension_example/
-   |
-   +- src/
-   |  |
-   |  +- example.c         <- C extension source
-   |
-   +- test/
-   |  |
-   |  +- example.rb        <- Test code for C extension
-   |
-   +- mrbgem.rake          <- GEM specification
-   |
-   +- README.md
-```
+	+- c_extension_example/
+	   |
+	   +- src/
+	   |  |
+	   |  +- example.c         <- C extension source
+	   |
+	   +- test/
+	   |  |
+	   |  +- example.rb        <- Test code for C extension
+	   |
+	   +- mrbgem.rake          <- GEM specification
+	   |
+	   +- README.md
 
 ## Ruby Extension
 
@@ -136,21 +135,19 @@ none
 
 ### Example
 
-```
-+- ruby_extension_example/
-   |
-   +- mrblib/
-   |  |
-   |  +- example.rb        <- Ruby extension source
-   |
-   +- test/
-   |  |
-   |  +- example.rb        <- Test code for Ruby extension
-   |
-   +- mrbgem.rake          <- GEM specification
-   |
-   +- README.md
-```
+	+- ruby_extension_example/
+	   |
+	   +- mrblib/
+	   |  |
+	   |  +- example.rb        <- Ruby extension source
+	   |
+	   +- test/
+	   |  |
+	   |  +- example.rb        <- Test code for Ruby extension
+	   |
+	   +- mrbgem.rake          <- GEM specification
+	   |
+	   +- README.md
 
 ## C and Ruby Extension
 
@@ -164,21 +161,20 @@ See C and Ruby example.
 
 ### Example
 
-```
-+- c_and_ruby_extension_example/
-   |
-   +- mrblib/
-   |  |
-   |  +- example.rb        <- Ruby extension source
-   |
-   +- src/
-   |  |
-   |  +- example.c         <- C extension source
-   |
-   +- test/
-   |  |
-   |  +- example.rb        <- Test code for C and Ruby extension
-   |
-   +- mrbgem.rake          <- GEM specification
-   |
-   +- README.md
+	+- c_and_ruby_extension_example/
+	   |
+	   +- mrblib/
+	   |  |
+	   |  +- example.rb        <- Ruby extension source
+	   |
+	   +- src/
+	   |  |
+	   |  +- example.c         <- C extension source
+	   |
+	   +- test/
+	   |  |
+	   |  +- example.rb        <- Test code for C and Ruby extension
+	   |
+	   +- mrbgem.rake          <- GEM specification
+	   |
+	   +- README.md
diff --git a/doc/mrbgems/c_and_ruby_extension_example/src/example.c b/doc/mrbgems/c_and_ruby_extension_example/src/example.c
index 3d3cb20c9..7651ae5c0 100644
--- a/doc/mrbgems/c_and_ruby_extension_example/src/example.c
+++ b/doc/mrbgems/c_and_ruby_extension_example/src/example.c
@@ -13,3 +13,8 @@ mrb_c_and_ruby_extension_example_gem_init(mrb_state* mrb) {
   struct RClass *class_cextension = mrb_define_module(mrb, "CRubyExtension");
   mrb_define_class_method(mrb, class_cextension, "c_method", mrb_c_method, ARGS_NONE());
 }
+
+void
+mrb_c_and_ruby_extension_example_gem_final(mrb_state* mrb) {
+  // finalizer
+}
diff --git a/doc/mrbgems/c_extension_example/src/example.c b/doc/mrbgems/c_extension_example/src/example.c
index 11f54e6d2..fa166186d 100644
--- a/doc/mrbgems/c_extension_example/src/example.c
+++ b/doc/mrbgems/c_extension_example/src/example.c
@@ -13,3 +13,8 @@ mrb_c_extension_example_gem_init(mrb_state* mrb) {
   struct RClass *class_cextension = mrb_define_module(mrb, "CExtension");
   mrb_define_class_method(mrb, class_cextension, "c_method", mrb_c_method, ARGS_NONE());
 }
+
+void
+mrb_c_extension_example_gem_final(mrb_state* mrb) {
+  // finalizer
+}
diff --git a/mrblib/mrblib.rake b/mrblib/mrblib.rake
index 46d8c5a79..5b4070745 100644
--- a/mrblib/mrblib.rake
+++ b/mrblib/mrblib.rake
@@ -7,7 +7,7 @@ MRuby.each_target do
     mrbc_, *rbfiles = t.prerequisites
     FileUtils.mkdir_p File.dirname(t.name)
     open(t.name, 'w') do |f|
-      _pp "GEN *.rb > #{t.name}"
+      _pp "GEN", "*.rb", "#{t.name}"
       f.puts File.read("#{dir}/init_mrblib.c")
       mrbc.run f, rbfiles, 'mrblib_irep'
     end
diff --git a/src/init.c b/src/init.c
index 48008b150..73ff8fce2 100644
--- a/src/init.c
+++ b/src/init.c
@@ -28,6 +28,7 @@ void mrb_init_time(mrb_state*);
 void mrb_init_math(mrb_state*);
 void mrb_init_mrblib(mrb_state*);
 void mrb_init_mrbgems(mrb_state*);
+void mrb_final_mrbgems(mrb_state*);
 
 #define DONE mrb_gc_arena_restore(mrb, 0);
 void
@@ -70,3 +71,11 @@ mrb_init_core(mrb_state *mrb)
   mrb_init_mrbgems(mrb); DONE;
 #endif
 }
+
+void
+mrb_final_core(mrb_state *mrb)
+{
+#ifndef DISABLE_GEMS
+  mrb_final_mrbgems(mrb); DONE;
+#endif
+}
\ No newline at end of file
diff --git a/src/init_ext.c b/src/init_ext.c
deleted file mode 100644
index 96ee34da1..000000000
--- a/src/init_ext.c
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
-** init_ext.c - initialize extend libraries
-**
-** See Copyright Notice in mruby.h
-*/
-
-#include "mruby.h"
-
-void
-mrb_init_ext(mrb_state *mrb)
-{
-#ifdef INCLUDE_SOCKET
-  extern void mrb_init_socket(mrb_state *mrb);
-  mrb_init_socket(mrb);
-#endif
-}
diff --git a/src/load.c b/src/load.c
index 504246799..78ece114f 100644
--- a/src/load.c
+++ b/src/load.c
@@ -138,7 +138,7 @@ load_rite_irep_record(mrb_state *mrb, RiteFILE* rfp, unsigned char* dst, uint32_
   int i;
   uint32_t blocklen;
   uint16_t offset, pdl, snl, clen;
-  unsigned char hex2[2], hex4[4], hex8[8], hcrc[4];
+  unsigned char hex2[2] = {0}, hex4[4] = {0}, hex8[8] = {0}, hcrc[4] = {0};
   unsigned char *pStart;
   char *char_buf;
   uint16_t buf_size =0;
diff --git a/src/state.c b/src/state.c
index c1ad4c6ad..e30b0cea3 100644
--- a/src/state.c
+++ b/src/state.c
@@ -11,7 +11,7 @@
 
 void mrb_init_heap(mrb_state*);
 void mrb_init_core(mrb_state*);
-void mrb_init_ext(mrb_state*);
+void mrb_final_core(mrb_state*);
 
 mrb_state*
 mrb_open_allocf(mrb_allocf f, void *ud)
@@ -27,7 +27,6 @@ mrb_open_allocf(mrb_allocf f, void *ud)
 
   mrb_init_heap(mrb);
   mrb_init_core(mrb);
-  mrb_init_ext(mrb);
   return mrb;
 }
 
@@ -88,6 +87,8 @@ mrb_close(mrb_state *mrb)
 {
   int i;
 
+  mrb_final_core(mrb);
+
   /* free */
   mrb_gc_free_gv(mrb);
   mrb_free(mrb, mrb->stbase);
diff --git a/tasks/mrbgem_spec.rake b/tasks/mrbgem_spec.rake
index 612ff242a..3e37f454d 100644
--- a/tasks/mrbgem_spec.rake
+++ b/tasks/mrbgem_spec.rake
@@ -105,6 +105,8 @@ module MRuby
           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 mrb_#{funcname}_gem_final(mrb_state *mrb);]
+          f.puts %Q[]
           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")]
@@ -117,6 +119,10 @@ module MRuby
           end
           f.puts %Q[  mrb_gc_arena_restore(mrb, ai);]
           f.puts %Q[}]
+          f.puts %Q[]
+          f.puts %Q[void GENERATED_TMP_mrb_#{funcname}_gem_final(mrb_state *mrb) {]
+          f.puts %Q[  mrb_#{funcname}_gem_final(mrb);] if objs != [objfile("#{build_dir}/gem_init")]
+          f.puts %Q[}]
         end
       end # generate_gem_init
 
diff --git a/tasks/mrbgems.rake b/tasks/mrbgems.rake
index dc5e67eef..9d8798ef3 100644
--- a/tasks/mrbgems.rake
+++ b/tasks/mrbgems.rake
@@ -24,10 +24,18 @@ MRuby.each_target do
         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[]
+        f.puts %Q[#{gems.map{|g| "void GENERATED_TMP_mrb_%s_gem_final(mrb_state* mrb);" % g.funcname}.join("\n")}]
+        f.puts %Q[]
         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[}]
+        f.puts %Q[]
+        f.puts %Q[void]
+        f.puts %Q[mrb_final_mrbgems(mrb_state *mrb) {]
+        f.puts %Q[#{gems.map{|g| "GENERATED_TMP_mrb_%s_gem_final(mrb);" % g.funcname}.join("\n")}]
+        f.puts %Q[}]
       end
     end
   end
diff --git a/tasks/mruby_build.rake b/tasks/mruby_build.rake
index b9e0d2749..08c0a5a05 100644
--- a/tasks/mruby_build.rake
+++ b/tasks/mruby_build.rake
@@ -29,10 +29,6 @@ module MRuby
       conf.instance_eval(&@initializer)
     end
 
-    def toolchain(name)
-      @@toolchains[name.to_s].setup(self)
-    end
-
     def self.load
       Dir.glob("#{File.dirname(__FILE__)}/toolchains/*.rake").each do |file|
         Kernel.load file
@@ -93,7 +89,9 @@ module MRuby
     end
 
     def toolchain(name)
-      Toolchain.toolchains[name.to_s].setup(self)
+      tc = Toolchain.toolchains[name.to_s]
+      fail "Unknown #{name} toolchain" unless tc
+      tc.setup(self)
     end
 
     def build_dir
@@ -148,6 +146,16 @@ module MRuby
       sh "#{filename mrbtest}"
       puts 
     end
+
+    def print_build_summary
+      puts "================================================"
+      puts "      Config Name: #{@name}"
+      puts " Output Directory: #{self.build_dir}"
+      puts "         Binaries: #{@bins.join(', ')}" unless @bins.empty?
+      puts "    Included Gems: #{@gems.map{|g| g.name }.join(', ')}" unless @gems.empty?
+      puts "================================================"
+      puts
+    end
   end # Build
 
   class CrossBuild < Build
diff --git a/tasks/mruby_build_commands.rake b/tasks/mruby_build_commands.rake
index abaf3a72c..23d2c31ae 100644
--- a/tasks/mruby_build_commands.rake
+++ b/tasks/mruby_build_commands.rake
@@ -56,8 +56,12 @@ module MRuby
     
     def run(outfile, infile, _defineds=[], _include_paths=[], _flags=[])
       FileUtils.mkdir_p File.dirname(outfile)
-      _pp "CC #{filename(infile)} > #{filename(outfile)}"
-      _run compile_options, { :flags => all_flags(_defineds, [_include_paths, File.dirname(infile)], _flags),
+      define_flags = [defines, _defineds].flatten.map{ |d| option_define % d }
+      include_path_flags = [include_paths, _include_paths, File.dirname(infile)].flatten.map do |f|
+        option_include_path % filename(f)
+      end
+      _pp "CC", "#{filename(infile)}", "#{filename(outfile)}"
+      _run compile_options, { :flags => all_flags(_defineds, _include_paths, _flags),
                               :infile => filename(infile), :outfile => filename(outfile) }
     end
 
@@ -125,14 +129,12 @@ module MRuby
     end
 
     def library_flags(_libraries)
-      [libraries, _libraries].flatten.reverse.map do |d|
-        option_library % d
-      end.join(' ')
+      [libraries, _libraries].flatten.map{ |d| option_library % d }.join(' ')
     end
 
     def run(outfile, objfiles, _libraries=[], _library_paths=[], _flags=[], _flags_before_libraries=[])
       FileUtils.mkdir_p File.dirname(outfile)
-      library_flags = [libraries, _libraries].flatten.reverse.map { |d| option_library % d }
+      library_flags = [libraries, _libraries].flatten.map { |d| option_library % d }
       library_path_flags = [library_paths, _library_paths].flatten.map { |f| option_library_path % filename(f) }
       _pp "LD #{filename(outfile)}"
       _run link_options, { :flags => all_flags(_library_paths, _flags),
@@ -153,7 +155,7 @@ module MRuby
 
     def run(outfile, objfiles)
       FileUtils.mkdir_p File.dirname(outfile)
-      _pp "AR #{filename(outfile)}"
+      _pp "AR", "#{filename(outfile)}"
       _run archive_options, { :outfile => filename(outfile), :objs => filename(objfiles).join(' ') }
     end
   end
@@ -169,7 +171,7 @@ module MRuby
 
     def run(outfile, infile)
       FileUtils.mkdir_p File.dirname(outfile)
-      _pp "YACC #{filename(infile)} > #{filename(outfile)}"
+      _pp "YACC", "#{filename(infile)}", "#{filename(outfile)}"
       _run compile_options, { :outfile => filename(outfile) , :infile => filename(infile) }
     end
   end
@@ -185,7 +187,7 @@ module MRuby
 
     def run(outfile, infile)
       FileUtils.mkdir_p File.dirname(outfile)
-      _pp "GPERF #{filename(infile)} > #{filename(outfile)}"
+      _pp "GPERF", "#{filename(infile)}", "#{filename(outfile)}"
       _run compile_options, { :outfile => filename(outfile) , :infile => filename(infile) }
     end
   end
@@ -202,7 +204,7 @@ module MRuby
     end
 
     def run_clone(dir, url, _flags = [])
-      _pp "GIT #{url} > #{filename(dir)}"
+      _pp "GIT", "#{url}", "#{filename(dir)}"
       _run clone_options, { :flags => [flags, _flags].flatten.join(' '), :url => url, :dir => filename(dir) }
     end
   end
@@ -218,7 +220,7 @@ module MRuby
       @command ||= @build.mrbcfile
       IO.popen("#{filename @command} #{@compile_options % {:funcname => funcname}}", 'r+') do |io|
         [infiles].flatten.each do |f|
-          _pp "  MRBC #{f}"
+          _pp "MRBC", "#{f}", nil, :indent => 2
           io.write IO.read(f)
         end
         io.close_write
diff --git a/tasks/mruby_build_gem.rake b/tasks/mruby_build_gem.rake
index ae0a79447..80990773d 100644
--- a/tasks/mruby_build_gem.rake
+++ b/tasks/mruby_build_gem.rake
@@ -2,7 +2,11 @@ module MRuby
   module LoadGems
     def gem(gemdir, &block)
       gemdir = load_external_gem(gemdir) if gemdir.is_a?(Hash)
-      load File.join(gemdir, "mrbgem.rake")
+      gemrake = File.join(gemdir, "mrbgem.rake")
+
+      fail "Can't find #{gemrake}" unless File.exists?(gemrake)
+      load gemrake
+
       Gem.current.dir = gemdir
       Gem.current.build = MRuby::Build.current
       Gem.current.build_config_initializer = block
diff --git a/tasks/ruby_ext.rake b/tasks/ruby_ext.rake
index 2536a2e4b..6817f6018 100644
--- a/tasks/ruby_ext.rake
+++ b/tasks/ruby_ext.rake
@@ -57,6 +57,10 @@ else
   $pp_show = false if $verbose
 end
 
-def _pp(msg)
-  puts msg if $pp_show
+def _pp(cmd, src, tgt=nil, options={})
+  return unless $pp_show
+
+  width = 5
+  template = options[:indent] ? "%#{width*options[:indent]}s %s %s" : "%-#{width}s %s %s"
+  puts template % [cmd, src, tgt ? "-> #{tgt}" : nil]
 end
diff --git a/tasks/toolchains/clang.rake b/tasks/toolchains/clang.rake
index 01dd5f234..1785c4c79 100644
--- a/tasks/toolchains/clang.rake
+++ b/tasks/toolchains/clang.rake
@@ -1,6 +1,8 @@
 MRuby::Toolchain.new(:clang) do |conf|
   toolchain :gcc
 
-  conf.cc.command = ENV['CC'] || 'clang'
+  [conf.cc, conf.cxx, conf.objc].each do |cc|
+    cc.command = ENV['CC'] || 'clang'
+  end
   conf.linker.command = ENV['LD'] || 'clang'
 end
diff --git a/tasks/toolchains/gcc.rake b/tasks/toolchains/gcc.rake
index 3a3485a17..8d83c8407 100644
--- a/tasks/toolchains/gcc.rake
+++ b/tasks/toolchains/gcc.rake
@@ -1,5 +1,5 @@
 MRuby::Toolchain.new(:gcc) do |conf|
-  conf.cc do |cc|
+  [conf.cc, conf.cxx, conf.objc].each do |cc|
     cc.command = ENV['CC'] || 'gcc'
     cc.flags = [ENV['CFLAGS'] || %w(-g -O3 -Wall -Werror-implicit-function-declaration)]
     cc.include_paths = ["#{root}/include"]
diff --git a/tasks/toolchains/vs2012.rake b/tasks/toolchains/vs2012.rake
index 108b4333f..0662ba27d 100644
--- a/tasks/toolchains/vs2012.rake
+++ b/tasks/toolchains/vs2012.rake
@@ -1,5 +1,5 @@
 MRuby::Toolchain.new(:vs2012) do |conf|
-  conf.cc do |cc|
+  [conf.cc, conf.cxx].each 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"]
diff --git a/test/mrbtest.rake b/test/mrbtest.rake
index 30444bd98..a86be2b13 100644
--- a/test/mrbtest.rake
+++ b/test/mrbtest.rake
@@ -20,7 +20,7 @@ MRuby.each_target do
 
   file mlib => [clib]
   file clib => [mrbcfile, init, asslib] + mrbs do |t|
-    _pp "GEN *.rb > #{clib}"
+    _pp "GEN", "*.rb", "#{clib}"
     open(clib, 'w') do |f|
       f.puts IO.read(init)
       mrbc.run f, [asslib] + mrbs, 'mrbtest_irep'
diff --git a/tools/mrbc/mrbc.c b/tools/mrbc/mrbc.c
index 4dc9871c7..63762143a 100644
--- a/tools/mrbc/mrbc.c
+++ b/tools/mrbc/mrbc.c
@@ -231,4 +231,9 @@ void
 mrb_init_mrbgems(mrb_state *mrb)
 {
 }
+
+void
+mrb_final_mrbgems(mrb_state *mrb)
+{
+}
 #endif