Fix: xcode-ninja should generate Xcode workspace into generator_output

pylib/gyp/xcode_ninja.py

 # Copyright (c) 2014 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Xcode-ninja wrapper project file generator.
 
 This updates the data structures passed to the Xcode gyp generator to build
 with ninja instead. The Xcode project itself is transformed into a list of
 executable targets, each with a build step to build with ninja, and a target
 with every source and resource file.  This appears to sidestep some of the
 major performance headaches experienced using complex projects and large number
 of targets within Xcode.
 """
 
 import errno
 import gyp.generator.ninja
 import os
 import re
 import xml.sax.saxutils
 
 
-def _WriteWorkspace(main_gyp, sources_gyp):
+def _WriteWorkspace(main_gyp, sources_gyp, params):
   """ Create a workspace to wrap main and sources gyp paths. """
   (build_file_root, build_file_ext) = os.path.splitext(main_gyp)
   workspace_path = build_file_root + '.xcworkspace'
+  options = params['options']
+  if options.generator_output:
+    workspace_path = os.path.join(options.generator_output, workspace_path)
   try:
     os.makedirs(workspace_path)
   except OSError, e:
     if e.errno != errno.EEXIST:
       raise
   output_string = '<?xml version="1.0" encoding="UTF-8"?>\n' + \
                   '<Workspace version = "1.0">\n'
   for gyp_name in [main_gyp, sources_gyp]:
     name = os.path.splitext(os.path.basename(gyp_name))[0] + '.xcodeproj'
     name = xml.sax.saxutils.quoteattr("group:" + name)
@@ skipping 212 matching lines @@
   new_data_target['_DEPTH'] = depth
   new_data_target['toolset'] = "target"
   new_data[sources_gyp] = {}
   new_data[sources_gyp]['targets'] = []
   new_data[sources_gyp]['included_files'] = []
   new_data[sources_gyp]['xcode_settings'] = \
       data[orig_gyp].get('xcode_settings', {})
   new_data[sources_gyp]['targets'].append(new_data_target)
 
   # Write workspace to file.
-  _WriteWorkspace(main_gyp, sources_gyp)
+  _WriteWorkspace(main_gyp, sources_gyp, params)
   return (new_target_list, new_target_dicts, new_data)