Remove direct references to hermetic mac toolchain.

build/mac/find_sdk.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Prints the lowest locally available SDK version greater than or equal to a
-given minimum sdk version to standard output.
+given minimum sdk version to standard output. If --developer_dir is passed, then
+the script will use the Xcode toolchain located at DEVELOPER_DIR.
 
 Usage:
-  python find_sdk.py 10.6  # Ignores SDKs < 10.6
+  python find_sdk.py [--developer_dir DEVELOPER_DIR] 10.6  # Ignores SDKs < 10.6
 """
 
+import argparse
 import os
 import re
 import subprocess
 import sys
 
-sys.path.append(os.path.dirname(os.path.dirname(__file__)))
-import mac_toolchain
-
 from optparse import OptionParser
 
 
 def parse_version(version_str):
   """'10.6' => [10, 6]"""
   return map(int, re.findall(r'(\d+)', version_str))
 
 
 def main():
   parser = OptionParser()
   parser.add_option("--verify",
                     action="store_true", dest="verify", default=False,
                     help="return the sdk argument and warn if it doesn't exist")
   parser.add_option("--sdk_path",
                     action="store", type="string", dest="sdk_path", default="",
                     help="user-specified SDK path; bypasses verification")
   parser.add_option("--print_sdk_path",
                     action="store_true", dest="print_sdk_path", default=False,
                     help="Additionaly print the path the SDK (appears first).")
+  parser.add_option("--developer_dir", help='Path to Xcode.')
   options, args = parser.parse_args()
   if len(args) != 1:
     parser.error('Please specify a minimum SDK version')
   min_sdk_version = args[0]
 
-  # Try using the toolchain in mac_files.
-  mac_toolchain.SetToolchainEnvironment()
+  if options.developer_dir:
+    os.environ['DEVELOPER_DIR'] = options.developer_dir
 
   job = subprocess.Popen(['xcode-select', '-print-path'],
                          stdout=subprocess.PIPE,
                          stderr=subprocess.STDOUT)
   out, err = job.communicate()
   if job.returncode != 0:
     print >> sys.stderr, out
     print >> sys.stderr, err
     raise Exception('Error %d running xcode-select' % job.returncode)
   sdk_dir = os.path.join(
@@ skipping 25 matching lines @@
         ['xcrun', '-sdk', 'macosx' + best_sdk, '--show-sdk-path']).strip()
 
   return best_sdk
 
 
 if __name__ == '__main__':
   if sys.platform != 'darwin':
     raise Exception("This script only runs on Mac")
   print main()
   sys.exit(0)