Add support for building the Dart VM for Android OS.

tools/build.py

 #!/usr/bin/env python
 #
 # 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.
 #
 
 import optparse
 import os
 import shutil
@@ skipping 11 matching lines @@
       help='Build variants (comma-separated).',
       metavar='[all,debug,release]',
       default='debug')
   result.add_option("-v", "--verbose",
       help='Verbose output.',
       default=False, action="store_true")
   result.add_option("--arch",
       help='Target architectures (comma-separated).',
       metavar='[all,ia32,x64,simarm,arm]',
       default=utils.GuessArchitecture())
+  result.add_option("--toolchainprefix",
+      help='Target toolchain prefix')
   result.add_option("-j",
       help='The number of parallel jobs to run.',
       metavar=HOST_CPUS,
       default=str(HOST_CPUS))
   result.add_option("--devenv",
       help='Path containing devenv.com on Windows',
       default='C:\\Program Files (x86)\\Microsoft Visual Studio 9.0\\Common7\\IDE')
   return result
 
 
 def ProcessOptions(options):
   if options.arch == 'all':
     options.arch = 'ia32,x64'
   if options.mode == 'all':
     options.mode = 'release,debug'
   options.mode = options.mode.split(',')
   options.arch = options.arch.split(',')
   for mode in options.mode:
     if not mode in ['debug', 'release']:
       print "Unknown mode %s" % mode
       return False
   for arch in options.arch:
     if not arch in ['ia32', 'x64', 'simarm', 'arm']:
       print "Unknown arch %s" % arch
       return False
   return True
 
 
-def setTools(arch):
+def setTools(arch, toolchainprefix):
   if arch == 'arm':
     toolsOverride = {
       "CC"  :  armcompilerlocation + "/bin/arm-none-linux-gnueabi-gcc",
       "CXX" :  armcompilerlocation + "/bin/arm-none-linux-gnueabi-g++",
       "AR"  :  armcompilerlocation + "/bin/arm-none-linux-gnueabi-ar",
       "LINK":  armcompilerlocation + "/bin/arm-none-linux-gnueabi-g++",
       "NM"  :  armcompilerlocation + "/bin/arm-none-linux-gnueabi-nm",
     }
     return toolsOverride
-
+  if toolchainprefix:
+    toolsOverride = {
+      "CC"  :  toolchainprefix + "-gcc",
+      "CXX" :  toolchainprefix + "-g++",
+      "AR"  :  toolchainprefix + "-ar",
+      "LINK":  toolchainprefix + "-g++",
+      "NM"  :  toolchainprefix + "-nm",
+    }
+    return toolsOverride
 
 def Execute(args):
   print "#" + ' '.join(args)
   process = subprocess.Popen(args)
   process.wait()
   if process.returncode != 0:
     raise Error(args[0] + " failed")
 
 
 def CurrentDirectoryBaseName():
@@ skipping 61 matching lines @@
         args = [make,
                 '-j',
                 options.j,
                 'BUILDTYPE=' + build_config,
                 ]
         if options.verbose:
           args += ['V=1']
 
         args += [target]
 
-      toolsOverride = setTools(arch)
+      toolsOverride = setTools(arch, options.toolchainprefix)
       if toolsOverride:
         for k, v in toolsOverride.iteritems():
           args.append(  k + "=" + v)
           print k + " = " + v
 
       print ' '.join(args)
       process = subprocess.Popen(args)
       process.wait()
       if process.returncode != 0:
         print "BUILD FAILED"
         return 1
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(Main())