orderfile: Don't report failure when a few symbol pairs are misordered.

tools/cygprofile/check_orderfile.py

 #!/usr/bin/python
 # Copyright 2015 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.
 
 """Check that symbols are ordered into a binary as they appear in the orderfile.
 """
 
 import logging
 import optparse
@@ skipping 56 matching lines @@
     previous_symbol_info = symbol_info
   return (misordered_count, len(matched_symbol_infos), missing_count)
 
 
 def main():
   parser = optparse.OptionParser(usage=
       'usage: %prog [options] <binary> <orderfile>')
   parser.add_option('--target-arch', action='store', dest='arch',
                     choices=['arm', 'arm64', 'x86', 'x86_64', 'x64', 'mips'],
                     help='The target architecture for the binary.')
-  parser.add_option('--threshold', action='store', dest='threshold', default=1,
+  parser.add_option('--threshold', action='store', dest='threshold', default=10,
                     help='The maximum allowed number of out-of-order symbols.')
   options, argv = parser.parse_args(sys.argv)
   if not options.arch:
     options.arch = cygprofile_utils.DetectArchitecture()
   if len(argv) != 3:
     parser.print_help()
     return 1
   (binary_filename, orderfile_filename) = argv[1:]
 
   symbol_extractor.SetArchitecture(options.arch)
   obj_dir = cygprofile_utils.GetObjDir(binary_filename)
   symbol_to_sections_map = \
       cyglog_to_orderfile.GetSymbolToSectionsMapFromObjectFiles(obj_dir)
   section_to_symbols_map = cygprofile_utils.InvertMapping(
       symbol_to_sections_map)
   symbols = patch_orderfile.GetSymbolsFromOrderfile(orderfile_filename,
                                                     section_to_symbols_map)
   symbol_infos = symbol_extractor.SymbolInfosFromBinary(binary_filename)
   # Missing symbols is not an error since some of them can be eliminated through
   # inlining.
   (misordered_pairs_count, matched_symbols, _) = _CountMisorderedSymbols(
       symbols, symbol_infos)
   return (misordered_pairs_count > options.threshold) or (matched_symbols == 0)
 
 
 if __name__ == '__main__':
   logging.basicConfig(level=logging.INFO)
   sys.exit(main())