Add support for building the Dart VM for Android OS.

tools/utils.py

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file contains a set of utilities functions used by other Python-based
 # scripts.
 
 import commands
 import os
 import platform
@@ skipping 117 matching lines @@
   global BUILD_MODES
   return BUILD_MODES[mode]
 
 
 def GetBuildConf(mode, arch):
   return '%s%s' % (GetBuildMode(mode), arch.upper())
 
 ARCH_GUESS = GuessArchitecture()
 BASE_DIR = os.path.abspath(os.path.join(os.curdir, '..'))
 
-def GetBuildRoot(target_os, mode=None, arch=None):
+
+def GetBuildDir(host_os, target_os):
   global BUILD_ROOT
+  build_dir = BUILD_ROOT[host_os]
+  if target_os and target_os != host_os:
+    build_dir = os.path.join(build_dir, target_os)
+  return build_dir
+
+def GetBuildRoot(host_os, mode=None, arch=None, target_os=None):
+  build_root = GetBuildDir(host_os, target_os)
   if mode:
-    return os.path.join(BUILD_ROOT[target_os], GetBuildConf(mode, arch))
-  else:
-    return BUILD_ROOT[target_os]
+    build_root = os.path.join(build_root, GetBuildConf(mode, arch))
+  return build_root
 
 def GetBaseDir():
   return BASE_DIR
 
 def GetSVNRevision():
   p = subprocess.Popen(['svn', 'info'], stdout = subprocess.PIPE,
       stderr = subprocess.STDOUT, shell=IsWindows())
   output, not_used = p.communicate()
   revision = ParseSvnInfoOutput(output)
   if revision:
@@ skipping 132 matching lines @@
 
 
 def Touch(name):
   with file(name, 'a'):
     os.utime(name, None)
 
 
 if __name__ == "__main__":
   import sys
   Main(sys.argv)