Adds deprecation messages for MIPS cross-builds

tools/ninja.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2017, 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 multiprocessing
 import optparse
 import os
 import subprocess
@@ skipping 44 matching lines @@
 
 
 def ProcessOsOption(os_name):
   if os_name == 'host':
     return HOST_OS
   return os_name
 
 
 def ProcessOptions(options, args):
   if options.arch == 'all':
-    options.arch = 'ia32,x64,simarm,simarm64,simmips,simdbc64'
+    options.arch = 'ia32,x64,simarm,simarm64,simdbc64'
   if options.mode == 'all':
     options.mode = 'debug,release,product'
   if options.os == 'all':
     options.os = 'host,android'
   options.mode = options.mode.split(',')
   options.arch = options.arch.split(',')
   options.os = options.os.split(',')
   for mode in options.mode:
     if not mode in ['debug', 'release', 'product']:
       print "Unknown mode %s" % mode
@@ skipping 142 matching lines @@
   if process.returncode != 0:
     print ("Tried to run goma_ctl.py, but it failed. Try running it manually: "
            + "\n\t" + ' '.join(goma_ctl_command))
     return False
   goma_started = True
   return True
 
 
 # Returns a tuple (build_config, command to run, whether goma is used)
 def BuildOneConfig(options, targets, target_os, mode, arch):
+  if arch.startswith('mips'):
+    bold  = '\033[1m'
+    reset = '\033[0m'
+    print(bold + "Warning: MIPS architectures are unlikely to be supported in "
+          "upcoming releases. Please consider using another architecture "
+          "and/or file an issue explaining your specific use of and need for "
+          "MIPS support." + reset)
   build_config = utils.GetBuildConf(mode, arch, target_os)
   out_dir = utils.GetBuildRoot(HOST_OS, mode, arch, target_os)
   using_goma = False
   if ShouldRunGN(out_dir):
     RunGN(target_os, mode, arch)
   command = ['ninja', '-C', out_dir]
   if options.verbose:
     command += ['-v']
   if UseGoma(out_dir):
     if EnsureGomaStarted(out_dir):
@@ skipping 70 matching lines @@
     if r != 0:
       return 1
 
   endtime = time.time()
   print ("The build took %.3f seconds" % (endtime - starttime))
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(Main())