xcode_emulation: Do not redirect stderr when calling xcodebuild.

pylib/gyp/xcode_emulation.py

 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 This module contains classes that help to emulate xcodebuild behavior on top of
 other build systems, such as make and ninja.
 """
 
 import gyp.common
@@ skipping 206 matching lines @@
   def GetExecutablePath(self):
     """Returns the directory name of the bundle represented by this target. E.g.
     Chromium.app/Contents/MacOS/Chromium."""
     if self._IsBundle():
       return self._GetBundleBinaryPath()
     else:
       return self._GetStandaloneBinaryPath()
 
   def _GetSdkVersionInfoItem(self, sdk, infoitem):
     job = subprocess.Popen(['xcodebuild', '-version', '-sdk', sdk, infoitem],
-                           stdout=subprocess.PIPE,
-                           stderr=subprocess.STDOUT)
+                           stdout=subprocess.PIPE)
     out = job.communicate()[0]
     if job.returncode != 0:
       sys.stderr.write(out + '\n')
       raise GypError('Error %d running xcodebuild' % job.returncode)
     return out.rstrip('\n')
 
   def _SdkPath(self):
     sdk_root = self.GetPerTargetSetting('SDKROOT', default='macosx')
     if sdk_root.startswith('/'):
       return sdk_root
@@ skipping 837 matching lines @@
 def GetSpecPostbuildCommands(spec, quiet=False):
   """Returns the list of postbuilds explicitly defined on |spec|, in a form
   executable by a shell."""
   postbuilds = []
   for postbuild in spec.get('postbuilds', []):
     if not quiet:
       postbuilds.append('echo POSTBUILD\\(%s\\) %s' % (
             spec['target_name'], postbuild['postbuild_name']))
     postbuilds.append(gyp.common.EncodePOSIXShellList(postbuild['action']))
   return postbuilds