Silence libtool warning when building libcrnet_standalone.a.

ios/build/packaging/link_dependencies.py

 #!/usr/bin/env python
 #
 # Copyright 2014 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.
 
 """Links the deps of a binary into a static library.
 
 Run with a working directory, the name of a binary target, and the name of the
 static library that should be produced. For example:
 
   $ link_dependencies.py out/Release-iphoneos \
                          crnet_consumer.app/crnet_consumer \
                          out/Release-iphoneos/crnet_standalone.a
 """
 
 import argparse
 import os
+import re
 import subprocess
+import sys
 
 
 class SubprocessError(Exception):
   pass
 
 
 def extract_inputs(query_result, prefix=''):
   """Extracts inputs from ninja query output.
 
   Given 'ninja -t query' output for a target, extracts all the inputs of that
@@ skipping 89 matching lines @@
   return deps
 
 
 def link(output, inputs):
   """Links output from inputs using libtool.
 
   Args:
     output: file system path to desired output library
     inputs: list of file system paths to input libraries
   """
-  p = subprocess.Popen(['libtool', '-o', output] + inputs)
-  p.communicate()
+  libtool_re = re.compile(r'^.*libtool: (?:for architecture: \S* )?'
+                          r'file: .* has no symbols$')
+  p = subprocess.Popen(
+      ['libtool', '-o', output] + inputs, stderr=subprocess.PIPE)
+  _, err = p.communicate()
+  for line in err.splitlines():
+    if not libtool_re.match(line) and not libtool_re5.match(line):

[droger, 2016/02/05 09:08:50]

Where is libtool_re5 defined? Do we need to import something?

[sdefresne, 2016/02/05 09:58:56]

Ooops. Removed.

+      print >>sys.stderr, line

[droger, 2016/02/05 09:08:50]

Missing whitespace after >>

[sdefresne, 2016/02/05 09:58:56]

No, this is the syntax to write to a file using print statement.

   if p.returncode != 0:
     message = "subprocess libtool returned {0}".format(p.returncode)
     raise SubprocessError(message)
 
 
 def main():
   parser = argparse.ArgumentParser(
       description='Link dependencies of a ninja target into a static library')
   parser.add_argument('workdir', nargs=1, help='ninja working directory')
   parser.add_argument('target', nargs=1, help='target to query for deps')
   parser.add_argument('output', nargs=1, help='path to output static library')
   args = parser.parse_args()
 
   inputs = query_ninja(args.target[0], args.workdir[0])
   link(args.output[0], list(library_deps(inputs, args.workdir[0])))
 
 
 if __name__ == '__main__':
   main()