generator output should be relative to depth.

pylib/gyp/generator/make.py

 # Copyright (c) 2013 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.
 
 # Notes:
 #
 # This is all roughly based on the Makefile system used by the Linux
 # kernel, but is a non-recursive make -- we put the entire dependency
 # graph in front of make and let it figure it out.
 #
@@ skipping 1933 matching lines @@
     """Determine where to write a Makefile for a given gyp file."""
     # Paths in gyp files are relative to the .gyp file, but we want
     # paths relative to the source root for the master makefile.  Grab
     # the path of the .gyp file as the base to relativize against.
     # E.g. "foo/bar" when we're constructing targets for "foo/bar/baz.gyp".
     base_path = gyp.common.RelativePath(os.path.dirname(build_file),
                                         options.depth)
     # We write the file in the base_path directory.
     output_file = os.path.join(options.depth, base_path, base_name)
     if options.generator_output:
-      output_file = os.path.join(options.generator_output, output_file)
+      output_file = os.path.join(
+          options.depth, options.generator_output, base_path, base_name)
     base_path = gyp.common.RelativePath(os.path.dirname(build_file),
                                         options.toplevel_dir)
     return base_path, output_file
 
   # TODO:  search for the first non-'Default' target.  This can go
   # away when we add verification that all targets have the
   # necessary configurations.
   default_configuration = None
   toolsets = set([target_dicts[target]['toolset'] for target in target_list])
   for target in target_list:
     spec = target_dicts[target]
     if spec['default_configuration'] != 'Default':
       default_configuration = spec['default_configuration']
       break
   if not default_configuration:
     default_configuration = 'Default'
 
   srcdir = '.'
   makefile_name = 'Makefile' + options.suffix
   makefile_path = os.path.join(options.toplevel_dir, makefile_name)
   if options.generator_output:
     global srcdir_prefix
-    makefile_path = os.path.join(options.generator_output, makefile_path)
+    makefile_path = os.path.join(
+        options.toplevel_dir, options.generator_output, makefile_name)
     srcdir = gyp.common.RelativePath(srcdir, options.generator_output)
     srcdir_prefix = '$(srcdir)/'
 
   flock_command= 'flock'
   header_params = {
       'default_target': default_target,
       'builddir': builddir_name,
       'default_configuration': default_configuration,
       'flock': flock_command,
       'flock_index': 1,
@@ skipping 182 matching lines @@
     root_makefile.write("endif\n")
   root_makefile.write('\n')
 
   if (not generator_flags.get('standalone')
       and generator_flags.get('auto_regeneration', True)):
     WriteAutoRegenerationRule(params, root_makefile, makefile_name, build_files)
 
   root_makefile.write(SHARED_FOOTER)
 
   root_makefile.close()