Links Xcode SDKs from the /SDKs directory (which you maintain yourself)

link-sdks

#!/usr/bin/python

# link-sdks
#   Nathan Toone <[email protected]>
#   Based on work by Rob Napier <[email protected]>

# Script to link in all your old SDKs every time you upgrade Xcode
# Create a directory called /Applications/Developer/SDKs (or modify source_path, or pass argument).
# Under it, put all the platform directories:
#   MacOSX.platform     iPhoneOS.platform       iPhoneSimulator.platform
# Under those, store the SDKs:
#   MacOSX10.4u.sdk MacOSX10.5.sdk  MacOSX10.6.sdk  MacOSX10.7.sdk  MacOSX10.8.sdk
#
# After upgrading Xcode, just run link-sdks.
#
# This script is based upon the script at https://gist.github.com/rnapier/3370649

import argparse
import subprocess
import os

# Load the command-line options
parser = argparse.ArgumentParser()
parser.add_argument('--sdksPath', help='path to SDKs', nargs=1)
parser.add_argument('--xcodePath', help='path to Xcode', nargs=1)
args = parser.parse_args()

#  Parse out the destination path
if args.xcodePath:
    dest_path = args.xcodePath[0]
else:
    dest_path = subprocess.check_output(['xcode-select', '--print-path']).rstrip()

if not dest_path.endswith('/Contents/Developer'):
    dest_path += '/Contents/Developer'

# Clean up any broken links
subprocess.call('find -L "%(dest_path)s/Platforms/"*"/Developer/SDKs" -type l -depth 1 -exec sudo rm -v {} \\;' % locals(), shell=True)

# Parse out the source path
if args.sdksPath:
    source_path = args.sdksPath[0]
else:
    source_path = subprocess.check_output(['brew', '--prefix']).rstrip()
    if source_path:
        source_path += '/share/legacy-sdks'

if not source_path or not os.path.isdir(source_path):
    source_path = '/Applications/Developer/SDKs'

# Link the SDKs and patch the Info.plist
if os.path.isdir(source_path):
    for platform in os.listdir(source_path):
        if (platform.endswith('.platform')):
            for sdk in os.listdir(source_path + '/' + platform + '/'):
                print('Linking %(sdk)s' % locals())
                if (sdk.endswith('.sdk')):
                    subprocess.call('sudo ln -sfn "%(source_path)s/%(platform)s/%(sdk)s" "%(dest_path)s/Platforms/%(platform)s/Developer/SDKs/%(sdk)s"' % locals(), shell=True)
            FNULL = open(os.devnull, 'w')
            subprocess.call('sudo /usr/libexec/PlistBuddy -c "Delete :MinimumSDKVersion" "%(dest_path)s/Platforms/%(platform)s/Info.plist"' % locals(), shell=True, stderr=FNULL)