Add work-around to symlink.gni to avoid "not up-to-date" ninja errors

build/symlink.py

 #!/usr/bin/env python
 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Make a symlink and optionally touch a file (to handle dependencies).
 
 Usage:
   symlink.py [options] sources... target
 
 A sym link to source is created at target. If multiple sources are specfied,
 then target is assumed to be a directory, and will contain all the links to
 the sources (basenames identical to their source).
 """
 
 import errno
 import optparse
 import os.path
 import shutil
 import sys
 
 
 def Main(argv):
   parser = optparse.OptionParser()
   parser.add_option('-f', '--force', action='store_true')
   parser.add_option('--touch')
+  parser.add_option('--update-target-mtimes', action='store_true')
 
   options, args = parser.parse_args(argv[1:])
   if len(args) < 2:
     parser.error('at least two arguments required.')
 
   target = args[-1]
   sources = args[:-1]
   for s in sources:
     t = os.path.join(target, os.path.basename(s))
     if len(sources) == 1 and not os.path.isdir(target):
       t = target
     t = os.path.expanduser(t)
     if os.path.realpath(t) == s:
       continue
     try:
       os.symlink(s, t)
     except OSError, e:
       if e.errno == errno.EEXIST and options.force:
         if os.path.isdir(t):
           shutil.rmtree(t, ignore_errors=True)
         else:
           os.remove(t)
         os.symlink(s, t)
       else:
         raise
+    if options.update_target_mtimes:
+      # Work-around for ninja bug:
+      # https://github.com/ninja-build/ninja/issues/1186
+      os.utime(s, None)

[Jackie Quinn, 2016/09/20 22:09:52]

Should this be os.utime(t, None) rather than s? This CL is causing compilation
failure on iOS.

 
 
   if options.touch:
     with open(options.touch, 'w') as f:
       pass
 
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))