Add a variable use_system_xcode to GN.

build/config/mac/compile_xib.py

 # Copyright 2016 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.
 
 
 import argparse
+import logging
 import os
 import re
 import subprocess
 import sys
 
 
 def main():
   parser = argparse.ArgumentParser(
       description='A script to compile xib and storyboard.',
       fromfile_prefix_chars='@')
   parser.add_argument('-o', '--output', required=True,
                       help='Path to output bundle.')
   parser.add_argument('-i', '--input', required=True,
                       help='Path to input xib or storyboard.')
+  parser.add_argument('--developer_dir', required=False,
+                      help='Path to Xcode.')
   args, unknown_args = parser.parse_known_args()
 
+  if (args.developer_dir):

[sdefresne, 2016/10/07 13:25:16]

style: parenthesis should have been omitted there

https://engdoc.corp.google.com/eng/doc/devguide/py/styleguide.shtml?cl=head#s...

+    os.environ['DEVELOPER_DIR'] = args.developer_dir
+
   ibtool_args = [
       'xcrun', 'ibtool',
       '--errors', '--warnings', '--notices',
       '--output-format', 'human-readable-text'
   ]
   ibtool_args += unknown_args
   ibtool_args += [
       '--compile',
       os.path.abspath(args.output),
       os.path.abspath(args.input)
   ]
 
   ibtool_section_re = re.compile(r'/\*.*\*/')
   ibtool_re = re.compile(r'.*note:.*is clipping its content')
   ibtoolout = subprocess.Popen(ibtool_args, stdout=subprocess.PIPE)
   current_section_header = None
   for line in ibtoolout.stdout:
     if ibtool_section_re.match(line):
       current_section_header = line
     elif not ibtool_re.match(line):
       if current_section_header:
         sys.stdout.write(current_section_header)
         current_section_header = None
       sys.stdout.write(line)
   return ibtoolout.returncode
 
 
 if __name__ == '__main__':
   sys.exit(main())