add chipKitMax32 target example

examples/targets/chipKitMax32.rb

+# Cross Compiling configuration for Digilent chipKIT Max32
+# http://www.digilentinc.com/Products/Detail.cfm?Prod=CHIPKIT-MAX32
+#
+# Requires MPIDE (https://github.com/chipKIT32/chipKIT32-MAX)
+#
+# This configuration is based on @kyab's version
+# http://d.hatena.ne.jp/kyab/20130201
+MRuby::CrossBuild.new("chipKitMax32") do |conf|
+  toolchain :gcc
+
+  # Mac OS X
+  # MPIDE_PATH = '/Applications/mpide.app/Contents/Resources/Java'
+  # GNU Linux
+  MPIDE_PATH = '/home/daniel/Downloads/mpide-0023-linux-20120903'
+
+  PIC32_PATH = "#{MPIDE_PATH}/hardware/pic32"  
+
+  conf.cc do |cc|
+    cc.command="#{PIC32_PATH}/compiler/pic32-tools/bin/pic32-gcc"
+    cc.include_paths = ["#{PIC32_PATH}/cores/pic32",
+                        "#{PIC32_PATH}/variants/Max32",
+                        "#{MRUBY_ROOT}/include"]
+    cc.flags << "-O2 -mno-smart-io -w -ffunction-sections -fdata-sections -g -mdebugger -Wcast-align " +
+                "-fno-short-double -mprocessor=32MX795F512L -DF_CPU=80000000L -DARDUINO=23 -D_BOARD_MEGA_ " +
+                "-DMPIDEVER=0x01000202 -DMPIDE=23"
+    cc.compile_options = "%{flags} -o %{outfile} -c %{infile}"
+  end
+
+  conf.archiver do |archiver|
+    archiver.command = "#{PIC32_PATH}/compiler/pic32-tools/bin/pic32-ar"
+    archiver.archive_options = 'rcs %{outfile} %{objs}'
+  end
+
+  # No binaries necessary
+  conf.bins = []
+end