made extension more rake-compiler friendly, made the spec task depend on "compile"

Rakefile

@@ -1,7 +1,7 @@
 # encoding: UTF-8
 begin
   require 'jeweler'
-  Jeweler::Tasks.new do |gem|
+  JEWELER = Jeweler::Tasks.new do |gem|
     gem.name = "mysql2"
     gem.summary = "A simple, fast Mysql library for Ruby, binding to libmysql"
     gem.email = "seniorlopez@gmail.com"
@@ -10,7 +10,7 @@ begin
     gem.require_paths = ["lib", "ext"]
     gem.extra_rdoc_files = `git ls-files *.rdoc`.split("\n")
     gem.files = `git ls-files`.split("\n")
-    gem.extensions = ["ext/extconf.rb"]
+    gem.extensions = ["ext/mysql2/extconf.rb"]
     gem.files.include %w(lib/jeweler/templates/.document lib/jeweler/templates/.gitignore)
     # gem.rubyforge_project = "mysql2"
   end
@@ -20,6 +20,8 @@ end
 
 require 'rake'
 require 'spec/rake/spectask'
+gem 'rake-compiler', '>= 0.4.1'
+require "rake/extensiontask"
 
 desc "Run all examples with RCov"
 Spec::Rake::SpecTask.new('spec:rcov') do |t|
@@ -32,4 +34,7 @@ end
 Spec::Rake::SpecTask.new('spec') do |t|
   t.spec_files = FileList['spec/']
   t.spec_opts << '--options' << 'spec/spec.opts'
-end
+end
+
+Rake::ExtensionTask.new("mysql2", JEWELER.gemspec)
+Rake::Task[:spec].prerequisites << :compile

ext/mysql2/extconf.rb

@@ -80,4 +80,4 @@ File.unlink 'confout'
 $CFLAGS << ' -Wall -Wextra -funroll-loops'
 # $CFLAGS << ' -O0 -ggdb3'
 
-create_makefile('mysql2_ext')
+create_makefile('mysql2/mysql2')

ext/mysql2/mysql2_ext.c

@@ -753,7 +753,7 @@ static VALUE rb_raise_mysql2_error(MYSQL *client) {
 }
 
 /* Ruby Extension initializer */
-void Init_mysql2_ext() {
+void Init_mysql2() {
   rb_require("date");
   rb_require("bigdecimal");
 

lib/mysql2.rb

@@ -1,9 +1,9 @@
 # encoding: UTF-8
-require 'mysql2_ext'
+require 'mysql2.so'
 
 # = Mysql2
 #
 # A modern, simple and very fast Mysql library for Ruby - binding to libmysql
 module Mysql2
   VERSION = "0.1.8"
-end
+end

spec/active_record/active_record_spec.rb

@@ -1,5 +1,6 @@
 # encoding: UTF-8
 require File.expand_path(File.dirname(__FILE__) + '/../spec_helper.rb')
+require 'rubygems'
 require 'active_record'
 require 'active_record/connection_adapters/mysql2_adapter'
 
@@ -145,4 +146,4 @@ describe ActiveRecord::ConnectionAdapters::Mysql2Adapter do
       test.set_test.should eql('val1,val2')
     end
   end
-end
+end