Build process updated:

You have to specify `TARGET` to specify a configuration, e.g.

```
rake TARGET=host-debug all test
```

When you port `mruby` to a new configuration:
1. copy an existing configuration under `target` directory
2. modify the new configuration file
3. build using the new configuration
4. send PR if you please

1 files changed, 0 insertions, 152 deletions

diff --git a/build_config.rb b/build_config.rb
deleted file mode 100644
index 254a28ce0..000000000
--- a/build_config.rb
+++ /dev/null
@@ -1,152 +0,0 @@
-MRuby::Build.new do |conf|
-  # load specific toolchain settings
-
-  # Gets set by the VS command prompts.
-  if ENV['VisualStudioVersion'] || ENV['VSINSTALLDIR']
-    toolchain :visualcpp
-  else
-    toolchain :gcc
-  end
-
-  # Turn on `enable_debug` for better debugging
-  # enable_debug
-
-  # Use mrbgems
-  # conf.gem 'examples/mrbgems/ruby_extension_example'
-  # conf.gem 'examples/mrbgems/c_extension_example' do |g|
-  #   g.cc.flags << '-g' # append cflags in this gem
-  # end
-  # conf.gem 'examples/mrbgems/c_and_ruby_extension_example'
-  # conf.gem :core => 'mruby-eval'
-  # conf.gem :mgem => 'mruby-onig-regexp'
-  # conf.gem :github => 'mattn/mruby-onig-regexp'
-  # conf.gem :git => '[email protected]:mattn/mruby-onig-regexp.git', :branch => 'master', :options => '-v'
-
-  # include the default GEMs
-  conf.gembox 'default'
-  # 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()
-  #   cc.option_include_path = %q[-I"%s"]
-  #   cc.option_define = '-D%s'
-  #   cc.compile_options = %Q[%{flags} -MMD -o "%{outfile}" -c "%{infile}"]
-  # end
-
-  # mrbc settings
-  # conf.mrbc do |mrbc|
-  #   mrbc.compile_options = "-g -B%{funcname} -o-" # The -g option is required for line numbers
-  # end
-
-  # Linker settings
-  # conf.linker do |linker|
-  #   linker.command = ENV['LD'] || 'gcc'
-  #   linker.flags = [ENV['LDFLAGS'] || []]
-  #   linker.flags_before_libraries = []
-  #   linker.libraries = %w()
-  #   linker.flags_after_libraries = []
-  #   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 = %q[-o "%{outfile}" "%{infile}"]
-  # end
-
-  # gperf settings
-  # conf.gperf do |gperf|
-  #   gperf.command = 'gperf'
-  #   gperf.compile_options = %q[-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
-
-  # file separetor
-  # conf.file_separator = '/'
-
-  # bintest
-  # 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(MRB_ENABLE_DEBUG_HOOK)
-
-  # Generate mruby debugger command (require mruby-eval)
-  conf.gem :core => "mruby-bin-debugger"
-
-  # bintest
-  # conf.enable_bintest
-end
-
-MRuby::Build.new('test') do |conf|
-  # Gets set by the VS command prompts.
-  if ENV['VisualStudioVersion'] || ENV['VSINSTALLDIR']
-    toolchain :visualcpp
-  else
-    toolchain :gcc
-  end
-
-  enable_debug
-  conf.enable_bintest
-  conf.enable_test
-
-  conf.gembox 'default'
-end
-
-#MRuby::Build.new('bench') do |conf|
-#  # Gets set by the VS command prompts.
-#  if ENV['VisualStudioVersion'] || ENV['VSINSTALLDIR']
-#    toolchain :visualcpp
-#  else
-#    toolchain :gcc
-#    conf.cc.flags << '-O3'
-#  end
-#
-#  conf.gembox 'default'
-#end
-
-# Define cross build settings
-# MRuby::CrossBuild.new('32bit') do |conf|
-#   toolchain :gcc
-#
-#   conf.cc.flags << "-m32"
-#   conf.linker.flags << "-m32"
-#
-#   conf.build_mrbtest_lib_only
-#
-#   conf.gem 'examples/mrbgems/c_and_ruby_extension_example'
-#
-#   conf.test_runner.command = 'env'
-# end