Deprecate --jobs (-j) option from build_mozc.py.

Historically we introduced '--jobs' (-j) option to build_mozc.py to
allow developers to specify build concurrency, and the option was
available for all the platforms (Windows, OS X, and Linux).

However, determining a good default build concurrency is indeed a hard
problem.  After a while, we ended up deprecating '--jobs' (-j) in
Windows and OS X build, and let build systems decide how and when
available CPU cores should be used to build instead.

With this CL, '--jobs' (-j) is deprecated even in Linux build, which
means that the option in question is finally removed completely.

If you want to have control of build concurrency for some reasons,
you should consider to intercept the build system command (e.g. 'ninja'
for Windows and Linux builds) with your own command wrapper, for
instance by tweaking PATH environment variable.  Once build_mozc.py
starts kicking your build command wrapper rather than the real build
command, you should be able to do whatever you want (e.g., specifying
build-system dependent options for finer control of build concurrency.

No behavior change in production binaries is intended.

BUG=
TEST=unittest
REF_BUG=
REF_CL=106276549

src/build_mozc.py

@@ -537,11 +537,6 @@ def ParseBuildOptions(args=None, values=None):
   """Parses command line options for the build command."""
   parser = optparse.OptionParser(usage='Usage: %prog build [options]')
   AddCommonOptions(parser)
-  if IsLinux():
-    default_build_concurrency = GetNumberOfProcessors() * 2
-    parser.add_option('--jobs', '-j', dest='jobs',
-                      default=('%d' % default_build_concurrency),
-                      metavar='N', help='run build jobs in parallel')
   parser.add_option('--configuration', '-c', dest='configuration',
                     default='Debug', help='specify the build configuration.')
 
@@ -566,11 +561,6 @@ def ParseRunTestsOptions(args=None, values=None):
   parser = optparse.OptionParser(
       usage='Usage: %prog runtests [options] [test_targets] [-- build options]')
   AddCommonOptions(parser)
-  if IsLinux():
-    default_build_concurrency = GetNumberOfProcessors() * 2
-    parser.add_option('--jobs', '-j', dest='jobs',
-                      default=('%d' % default_build_concurrency),
-                      metavar='N', help='run build jobs in parallel')
   default_test_jobs = GetNumberOfProcessors()
   parser.add_option('--test_jobs', dest='test_jobs', type='int',
                     default=default_test_jobs,
@@ -1005,8 +995,7 @@ def BuildOnLinux(options, targets, unused_original_directory_name):
   short_basename = GetBuildShortBaseName(options,
                                          GetMozcVersion().GetTargetPlatform())
   make_command = ninja
-  build_args = ['-j %s' % options.jobs,
-                '-C', '%s/%s' % (short_basename, options.configuration)]
+  build_args = ['-C', '%s/%s' % (short_basename, options.configuration)]
   RunOrDie([make_command] + build_args + target_names)
 
 

src/mozc_version_template.txt

@@ -1,6 +1,6 @@
 MAJOR=2
 MINOR=17
-BUILD=2155
+BUILD=2156
 REVISION=102
 # NACL_DICTIONARY_VERSION is the target version of the system dictionary to be
 # downloaded by NaCl Mozc.