Add Xcode-iPhoneOS/rakefile which can be used to build SDL.framework from the commandline

This is the rakefile from Andrey Nesterov, but slightly modified.
Use the following command:
  $ rake -f Xcode-iPhoneOS/rakefile
The resulting framework is placed in the ./build directory.

Xcode-iPhoneOS/rakefile

+# ------------------------------------------------------------------------------
+# Builds a SDL framework for the iOS
+# Copyright (c) 2011 Andrey Nesterov
+# See LICENSE for licensing information
+# ------------------------------------------------------------------------------
+#
+# Creates a pseudo-framework which contains a universal library that can be used
+# on a iOS and in the iOS simulator
+#
+# ------------------------------------------------------------------------------
+#
+# To configure the script, define:
+#   Conf    configuration, symbol (:release or :debug)
+#   SDK     version number of the iOS SDK, symbol (e.g. :"4.3")
+#   Arch    architecture for the device's library, symbol (e.g. :armv6 or :armv7)
+#
+# ------------------------------------------------------------------------------
+
+# --- Configure ----------------------------------------------------------------
+module Configure
+	Conf = :release
+	SDK = :"4.3"
+	Arch = :armv7
+end
+
+# --- Constants ----------------------------------------------------------------
+module Global
+	RootDir = Dir.pwd
+	SourceDir = "#{RootDir}"
+	BuildDir = "#{RootDir}/build"
+end
+
+# --- Common -------------------------------------------------------------------
+module Builder
+	def get_sources(from, to)
+		refresh_dir to
+		yield from, to
+	end
+
+	def build_library(project, dest, target, conf, sdk, arch)
+		print "\n"
+		dest = library_bundle_path(dest, conf, sdk, arch)
+		sdk, arch = compute_platform(sdk, arch)
+		conf = configuration(conf)
+
+		refresh_dir dest
+		refresh_dir "#{dest}.build"
+
+		proj_dir, proj_fname = File.split project
+		cd proj_dir
+		args = Array.new()
+		args.push("xcodebuild")
+		args.push("-project #{proj_fname}")
+		args.push("-sdk #{sdk}")
+		args.push("-configuration \"#{conf}\"")
+		args.push("-target \"#{target}\"")
+		# NATIVE_ARCH has no effect
+		#args.push("NATIVE_ARCH=#{arch.to_str}")
+		args.push("-arch #{arch.to_str}")
+		args.push("TARGETED_DEVICE_FAMILY=2")                 # 2 => iPad, 1 => iPhone
+		args.push("BUILT_PRODUCTS_DIR=\"build\"")
+		args.push("CONFIGURATION_BUILD_DIR=\"#{dest}\"")
+		args.push("CONFIGURATION_TEMP_DIR=\"#{dest}.build\"")
+		cmd = args.join(' ')
+		#print "\n"
+		print "#{cmd}\n"
+		`#{cmd}`
+	end
+
+	def build_framework_library(frameworkLib, deviceLib, simulatorLib)
+		print "\n"
+		refresh_dir File.dirname frameworkLib
+		cmd = "lipo -create #{deviceLib} #{simulatorLib} -o #{frameworkLib}"
+		print "#{cmd}\n"
+		`#{cmd}`
+	end
+
+	def build_framework(name, version, identifier, dest, headers, project, target, conf, sdk, arch)
+		libFileName = "lib#{name}.a";
+		libFilePath = "#{dest}/universal-#{conf}/#{libFileName}"
+
+		build_library(project, dest, target, conf, sdk, arch);
+		build_library(project, dest, target, conf, sdk, :i386);
+
+		build_framework_library(
+			libFilePath, 
+			"#{library_bundle_path(dest, conf, sdk, arch)}/#{libFileName}",
+			"#{library_bundle_path(dest, conf, sdk, :i386)}/#{libFileName}"
+		)
+		# Static library has version A
+		create_framework(name, "A", identifier, dest, headers, libFilePath)
+	end
+
+	def create_framework(name, version, identifier, dest, headers, lib)
+		print "\n"
+		frameworkVersion = version
+		frameworkBundle = framework_bundle_path(dest, name)
+
+		# creating framework's directories	
+		refresh_dir frameworkBundle
+		mkdir "#{frameworkBundle}/Versions"
+		mkdir "#{frameworkBundle}/Versions/#{frameworkVersion}"
+		mkdir "#{frameworkBundle}/Versions/#{frameworkVersion}/Resources"
+		mkdir "#{frameworkBundle}/Versions/#{frameworkVersion}/Headers"
+		mkdir "#{frameworkBundle}/Versions/#{frameworkVersion}/Documentation"
+
+		# creating framework's symlinks
+		`ln -s "#{frameworkVersion}" "#{frameworkBundle}/Versions/Current"`
+		`ln -s "Versions/Current/Headers" "#{frameworkBundle}/Headers"`
+		`ln -s "Versions/Current/Resources" "#{frameworkBundle}/Resources"`
+		`ln -s "Versions/Current/Documentation" "#{frameworkBundle}/Documentation"`
+		`ln -s "Versions/Current/#{File.basename lib}" "#{frameworkBundle}/#{name}"`
+
+		# copying lib
+		cp lib, "#{frameworkBundle}/Versions/#{frameworkVersion}"
+
+		# copying the header files. Copy everything found in the headers directory.
+		FileList["#{headers}/*.h"].each do |source|
+			cp source, "#{frameworkBundle}/Headers"
+		end
+
+		# creating plist
+		File.open("#{frameworkBundle}/Resources/Info.plist", "w") do |f|
+			f.puts '<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">'
+			f.puts "\
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>English</string>
+	<key>CFBundleExecutable</key>
+	<string>#{name}</string>
+	<key>CFBundleIdentifier</key>
+	<string>#{identifier}</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>#{version}</string>
+</dict>
+</plist>"
+		end
+	end
+
+	def library_bundle_path(path, conf, sdk, arch)
+		sdk, arch = compute_platform(sdk, arch)
+		"#{path}/#{sdk}-#{conf}"
+	end
+
+	def framework_bundle_path(path, name)
+		"#{path}/#{name}.framework"
+	end
+
+	def configuration(conf)
+		conf.to_s
+	end
+
+	def compute_platform(sdk, arch)
+		return [sdk, arch] if arch.class == String
+		[arch == :i386 ? "iphonesimulator" + sdk.to_s : "iphoneos" + sdk.to_s, arch.to_s]
+	end
+
+	def refresh_dir(path)
+		rm_rf path if FileTest.exists? path
+		mkdir_p path
+	end
+
+	private :configuration, :compute_platform, :refresh_dir
+end
+
+class InstanceBuilder
+	class Instance
+		extend Builder
+	end
+
+	def InstanceBuilder.message(text)
+		tailSize = 75 - text.length;
+		puts "--- #{text} #{'-' * (tailSize < 0 ? 0 : tailSize)}"
+	end
+end
+
+# --- SDL ----------------------------------------------------------------------
+class SDL < InstanceBuilder
+	SourceDir = "#{Global::SourceDir}"
+	BuildDir = "#{Global::BuildDir}"
+	
+	def SDL.build_framework(conf, sdk, arch)
+		message "Building SDL"
+		Instance.build_framework(
+			"SDL",
+			"1.3",
+			"org.libsdl",
+			BuildDir, 
+			"#{SourceDir}/include",
+			"#{SourceDir}/Xcode-iPhoneOS/SDL/SDLiPhoneOS.xcodeproj",
+			"libSDL",
+			conf,
+			sdk,
+			arch
+		)
+	end
+
+	def Instance.configuration(conf)
+		case conf
+			when :release
+				"Release"
+			when :debug
+				"Debug"
+		end
+	end
+end
+
+# --- Tasks --------------------------------------------------------------------
+task :default do
+	SDL.build_framework Configure::Conf, Configure::SDK, Configure::Arch
+end