CheckCallDie: add option to suppress successful output

build/android/gyp/util/build_utils.py

 # Copyright 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.
 
 import fnmatch
 import json
 import os
 import pipes
 import shlex
 import shutil
@@ skipping 53 matching lines @@
 
 def ReadJson(path):
   with open(path, 'r') as jsonfile:
     return json.load(jsonfile)
 
 
 # This can be used in most cases like subprocess.check_call. The output,
 # particularly when the command fails, better highlights the command's failure.
 # This call will directly exit on a failure in the subprocess so that no python
 # stacktrace is printed after the output of the failed command.
-def CheckCallDie(args, cwd=None):
+def CheckCallDie(args, suppress_output=False, cwd=None):
   if not cwd:
     cwd = os.getcwd()
 
   child = subprocess.Popen(args,
       stdout=subprocess.PIPE, stderr=subprocess.STDOUT, cwd=cwd)
 
   stdout, _ = child.communicate()
 
   if child.returncode:
     stacktrace = traceback.extract_stack()
     print >> sys.stderr, ''.join(traceback.format_list(stacktrace))
     # A user should be able to simply copy and paste the command that failed
     # into their shell.
     copyable_command = ' '.join(map(pipes.quote, args))
     copyable_command = ('( cd ' + os.path.abspath(cwd) + '; '
         + copyable_command + ' )')
     print >> sys.stderr, 'Command failed:', copyable_command, '\n'
 
     if stdout:
       print stdout,
 
     # Directly exit to avoid printing stacktrace.
     sys.exit(child.returncode)
 
   else:
-    if stdout:
+    if stdout and not suppress_output:
       print stdout,
     return stdout