Ensure all debug messages are flushed.

dart/runtime/tools/make_version.py

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 # This python script creates a version string in a C++ file.
 
 import os
 import sys
 import subprocess
 import platform
 import getpass
 from os.path import join
 import time
 from optparse import OptionParser
 
+def debugLog(message):
+  print >> sys.stderr, message
+  sys.stderr.flush()
+
+
 def getVersionPart(version_file, part):
   command = ['awk', '$1 == "%s" {print $2}' % (part), version_file]
-  print "Getting version part: %s Running command %s" % (part, command)
+  debugLog("Getting version part: %s Running command %s" % (part, command))
   proc = subprocess.Popen(command,
                           stdout=subprocess.PIPE,
                           stderr=subprocess.STDOUT)
   result = proc.communicate()[0].split('\n')[0]
-  print "Got result: %s" % result
+  debugLog("Got result: %s" % result)
   return result
 
 def getRevision():
-  print "Getting revision"
+  debugLog("Getting revision")
   is_svn = True
   if os.path.exists('.svn'):
-    print "Using svn to get revision"
+    debugLog("Using svn to get revision")
     cmd = ['svn', 'info']
   else:
-    print "Using git svn to get revision"
+    debugLog("Using git svn to get revision")
     cmd = ['git', 'svn', 'info']
   try:
-    print "Running command to get revision: %s" % cmd
+    debugLog("Running command to get revision: %s" % cmd)
     proc = subprocess.Popen(cmd,
                             stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
     revision = proc.communicate()[0].split('\n')[4].split(' ')[1]
-    print "Got revision: %s" % revision
+    debugLog("Got revision: %s" % revision)
     return revision
   except Exception:
     # If we can't get any revision info (due to lack of tooling) return ''.
     return ''
 
 
 def makeVersionString(version_file):
   id = platform.system()
   if id == 'Windows' or id == 'Microsoft':
     return '0.0.0.0'
   major = getVersionPart(version_file, 'MAJOR')
   minor = getVersionPart(version_file, 'MINOR')
   build = getVersionPart(version_file, 'BUILD')
   patch = getVersionPart(version_file, 'PATCH')
   revision = getRevision()
   user = getpass.getuser()
   version_string = '%s.%s.%s.%s_%s_%s' % (major,
                                           minor,
                                           build,
                                           patch,
                                           revision,
                                           user)
-  print "Returning version string: %s " % version_string
+  debugLog("Returning version string: %s " % version_string)
   return version_string
 
 def makeFile(output_file, input_file, version_file):
-  print "Making version file"
+  debugLog("Making version file")
   version_cc_text = open(input_file).read()
   version_string = makeVersionString(version_file)
-  print "Writing version to version_cc file: %s" % version_string
+  debugLog("Writing version to version_cc file: %s" % version_string)
   version_cc_text = version_cc_text.replace("{{VERSION_STR}}",
                                             version_string)
   version_time = time.ctime(time.time())
-  print "Writing time to version_cc file: %s" % version_time
+  debugLog("Writing time to version_cc file: %s" % version_time)
   version_cc_text = version_cc_text.replace("{{BUILD_TIME}}",
                                             version_time)
   open(output_file, 'w').write(version_cc_text)
   return True
 
 
 def main(args):
   try:
     # Parse input.
     parser = OptionParser()
@@ skipping 25 matching lines @@
       return -1
 
     return 0
   except Exception, inst:
     sys.stderr.write('make_version.py exception\n')
     sys.stderr.write(str(inst))
     sys.stderr.write('\n')
     return -1
 
 if __name__ == '__main__':
-  sys.stderr.write('starting make_version.py\n')
-  sys.stderr.flush()
+  debugLog('starting make_version.py')
   exit_code = main(sys.argv)
-  sys.stderr.write('exiting make_version.py (exit code: %s)\n' % exit_code)
-  sys.stderr.flush()
+  debugLog('exiting make_version.py (exit code: %s)' % exit_code)
   sys.exit(exit_code)