Add a rake task to precompile anything the compiler/parser needs

Rakefile

@@ -103,15 +103,23 @@ desc "Build everything that needs to be built"
 task :build => %w[
   vm
   kernel:build
+  build:compiler
 ]
 #  build:rbc
-#  compiler
 #  lib/etc.rb
 #  lib/rbconfig.rb
 #  extensions
 
 namespace :build do
 
+  task :compiler do
+    files = Dir["lib/compiler/**/*.rb"]
+    files.concat %w(lib/strscan.rb lib/stringio.rb lib/racc/parser.rb)
+    files.each do |path|
+      compile_ruby path, "#{path}c", true
+    end
+  end
+
 #   task :setup_rbc => :stable_compiler
 
 #   task :rbc => ([:setup_rbc] + AllPreCompiled)

rakelib/kernel.rake

@@ -74,7 +74,11 @@ def create_load_order(files, output=".load_order.txt")
   end
 end
 
-def compile_ruby(src, rbc)
+def compile_ruby(src, rbc, check_mtime = false)
+  if check_mtime and File.readable?(rbc)
+    return if File.mtime(rbc) >= File.mtime(src)
+  end
+
   dir = File.dirname rbc
   FileUtils.mkdir_p dir unless File.directory? dir