Update from https://crrev.com/306655

third_party/cython/python_flags.py

 # Copyright 2014 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 os
 import sys
 
 from distutils import sysconfig
 from distutils.command import build_ext
 from distutils.dist import Distribution
 from distutils.extension import Extension
 
 def main():
   """Command line utility to retrieve compilation options for python modules'
   """
   parser = argparse.ArgumentParser(
       description='Retrieves compilation options for python modules.')
-  parser.add_argument('--gn',
-                      help='Returns all values in a format suitable for gn',
-                      action='store_true')
   parser.add_argument('--libraries', help='Returns libraries',
                       action='store_true')
   parser.add_argument('--includes', help='Returns includes',
                       action='store_true')
   parser.add_argument('--library_dirs', help='Returns library_dirs',
                       action='store_true')
   opts = parser.parse_args()
 
   ext = Extension('Dummy', [])
   b = build_ext.build_ext(Distribution())
   b.initialize_options()
   b.finalize_options()
   result = []
   if opts.libraries:
     libraries = b.get_libraries(ext)
     if sys.platform == 'darwin':
       libraries.append('python%s' % sys.version[:3])
-    if not opts.gn and sys.platform in ['darwin', 'linux2']:
-      # In case of GYP output for darwin and linux prefix all
-      # libraries (if there are any) so the result can be used as a
-      # compiler argument. GN handles platform-appropriate prefixing itself.
-      libraries = ['-l%s' % library for library in libraries]
     result.extend(libraries)
   if opts.includes:
     result = result  + b.include_dirs
   if opts.library_dirs:
     if sys.platform == 'darwin':
       result.append('%s/lib' % sysconfig.get_config_vars('prefix')[0])
 
-  if opts.gn:
-    for x in result:
-      print x
-  else:
-    print ''.join(['"%s"' % x for x in result])
+  for x in result:
+    print x
 
 if __name__ == '__main__':
   main()