Revert `MRUBY_TARGET` mechanism; ref #5096

* In explanation of mruby, the expression `build_config.rb` is frequently
  used including official documents, so I think that it will not make sense
  if the file is no longer used.
* The `MRUBY_TARGET` mechanism seems to have little improvement, so I don't
  think it should be changed to avoid unnecessary confusion.
* `MRUBY_TARGET` and `MRuby.targets` represent somewhat different things,
  so using the same term "target" is a bit confusing.

The mechanism that can be written short when using a file under
`build_config` (renamed from `target`) directory remains
(`build_config/${MRUBY_CONFIG}.rb` is used if the path specified
in `MRUBY_CONFIG` doesn't exist).

1 files changed, 69 insertions, 0 deletions

diff --git a/build_config/IntelEdison.rb b/build_config/IntelEdison.rb
new file mode 100644
index 000000000..a22f9cfd2
--- /dev/null
+++ b/build_config/IntelEdison.rb
@@ -0,0 +1,69 @@
+# Cross-compiling setup for Intel Edison (poky linux) platform
+# Get SDK from here: https://software.intel.com/en-us/iot/hardware/edison/downloads
+# REMEMBER to check and update the SDK root in the constant POKY_EDISON_PATH
+
+MRuby::Build.new do |conf|
+  toolchain :gcc
+  conf.gembox 'default'
+  conf.cc.defines = %w(ENABLE_READLINE)
+  conf.gembox 'default'
+
+  #lightweight regular expression
+  conf.gem :github => "pbosetti/mruby-hs-regexp", :branch => "master"
+
+end
+
+# Define cross build settings
+MRuby::CrossBuild.new('core2-32-poky-linux') do |conf|
+  toolchain :gcc
+
+  # Mac OS X
+  #
+  POKY_EDISON_PATH = '/opt/poky-edison/1.7.2'
+
+  POKY_EDISON_SYSROOT =  "#{POKY_EDISON_PATH}/sysroots/core2-32-poky-linux"
+  POKY_EDISON_X86_PATH = "#{POKY_EDISON_PATH}/sysroots/i386-pokysdk-darwin"
+  POKY_EDISON_BIN_PATH = "#{POKY_EDISON_X86_PATH}/usr/bin/i586-poky-linux"
+
+
+  conf.cc do |cc|
+    cc.command = "#{POKY_EDISON_BIN_PATH}/i586-poky-linux-gcc"
+    cc.include_paths << ["#{POKY_EDISON_SYSROOT}/usr/include", "#{POKY_EDISON_X86_PATH}/usr/include"]
+    cc.flags = %w(-m32 -march=core2 -mtune=core2 -msse3 -mfpmath=sse -mstackrealign -fno-omit-frame-pointer)
+    cc.flags << %w(-O2 -pipe -g -feliminate-unused-debug-types)
+    cc.flags << "--sysroot=#{POKY_EDISON_SYSROOT}"
+    cc.compile_options = %Q[%{flags} -o "%{outfile}" -c "%{infile}"]
+    cc.defines = %w(ENABLE_READLINE)
+  end
+
+  conf.cxx do |cxx|
+    cxx.command = "#{POKY_EDISON_BIN_PATH}/i586-poky-linux-g++"
+    cxx.include_paths = conf.cc.include_paths.dup
+    cxx.include_paths << ["#{POKY_EDISON_SYSROOT}/usr/include/c++/4.9.1"]
+    cxx.flags = conf.cc.flags.dup
+    cxx.defines = conf.cc.defines.dup
+    cxx.compile_options = conf.cc.compile_options.dup
+  end
+
+  conf.archiver do |archiver|
+    archiver.command = "#{POKY_EDISON_BIN_PATH}/i586-poky-linux-ar"
+    archiver.archive_options = 'rcs "%{outfile}" %{objs}'
+  end
+
+  conf.linker do |linker|
+    linker.command = "#{POKY_EDISON_BIN_PATH}/i586-poky-linux-g++"
+    linker.flags = %w(-m32 -march=i586)
+    linker.flags << "--sysroot=#{POKY_EDISON_SYSROOT}"
+    linker.flags << %w(-O1)
+    linker.libraries = %w(m pthread)
+  end
+
+  #do not build executable test
+  conf.build_mrbtest_lib_only
+
+  conf.gembox 'default'
+
+  #lightweight regular expression
+  conf.gem :github => "pbosetti/mruby-hs-regexp", :branch => "master"
+
+end