Compress sources of JS libraries in addition to the snapshot.

src/SConscript

 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 205 matching lines @@
   'os:linux':   ['platform-linux.cc', 'platform-posix.cc'],
   'os:android': ['platform-linux.cc', 'platform-posix.cc'],
   'os:macos':   ['platform-macos.cc', 'platform-posix.cc'],
   'os:solaris': ['platform-solaris.cc', 'platform-posix.cc'],
   'os:cygwin':  ['platform-cygwin.cc', 'platform-posix.cc'],
   'os:nullos':  ['platform-nullos.cc'],
   'os:win32':   ['platform-win32.cc'],
   'mode:release': [],
   'mode:debug': [
     'objects-debug.cc', 'prettyprinter.cc', 'regexp-macro-assembler-tracer.cc'
-  ]
+  ],
+  'compress_startup_data:bz2': ['bz2-decompress.cc'],
 }
 
 
 PREPARSER_SOURCES = {
   'all': Split("""
     allocation.cc
     hashmap.cc
     preparse-data.cc
     preparser.cc
     preparser-api.cc
@@ skipping 72 matching lines @@
 def ConfigureObjectFiles():
   env = Environment(tools=tools)
   env.Replace(**context.flags['v8'])
   context.ApplyEnvOverrides(env)
   env['BUILDERS']['JS2C'] = Builder(action=js2c.JS2C)
   if 'ENABLE_LOGGING_AND_PROFILING' in env['CPPDEFINES']:
     env['BUILDERS']['Snapshot'] = Builder(action='$SOURCE $TARGET --logfile "$LOGFILE" --log-snapshot-positions')
   else:
     env['BUILDERS']['Snapshot'] = Builder(action='$SOURCE $TARGET')
 
+  def BuildJS2CEnv(type):
+    js2c_env = { 'TYPE': type, 'COMPRESSION': 'off' }
+    if 'COMPRESS_STARTUP_DATA_BZ2' in env['CPPDEFINES']:
+      js2c_env['COMPRESSION'] = 'bz2'
+    return js2c_env
+
   # Build the standard platform-independent source files.
   source_files = context.GetRelevantSources(SOURCES)
 
   d8_files = context.GetRelevantSources(D8_FILES)
-  d8_js = env.JS2C('d8-js.cc', 'd8.js', TYPE='D8')
+  d8_js = env.JS2C('d8-js.cc', 'd8.js', **{'TYPE': 'D8', 'COMPRESSION': 'off'})
   d8_js_obj = context.ConfigureObject(env, d8_js, CPPPATH=['.'])
   d8_objs = [context.ConfigureObject(env, [d8_files]), d8_js_obj]
 
   # Combine the JavaScript library files into a single C++ file and
   # compile it.
   library_files = [s for s in LIBRARY_FILES]
   library_files.append('macros.py')
-  libraries_src = env.JS2C(['libraries.cc'], library_files, TYPE='CORE')
+  libraries_src = env.JS2C(
+    ['libraries.cc'], library_files, **BuildJS2CEnv('CORE'))
   libraries_obj = context.ConfigureObject(env, libraries_src, CPPPATH=['.'])
 
   # Combine the experimental JavaScript library files into a C++ file
   # and compile it.
   experimental_library_files = [ s for s in EXPERIMENTAL_LIBRARY_FILES ]
   experimental_library_files.append('macros.py')
-  experimental_libraries_src = env.JS2C(['experimental-libraries.cc'], experimental_library_files, TYPE='EXPERIMENTAL')
+  experimental_libraries_src = env.JS2C(['experimental-libraries.cc'],
+                                        experimental_library_files,
+                                        **BuildJS2CEnv('EXPERIMENTAL'))
   experimental_libraries_obj = context.ConfigureObject(env, experimental_libraries_src, CPPPATH=['.'])
 
   source_objs = context.ConfigureObject(env, source_files)
   non_snapshot_files = [source_objs]
 
   preparser_source_files = context.GetRelevantSources(PREPARSER_SOURCES)
   preparser_objs = context.ConfigureObject(env, preparser_source_files)
 
   # Create snapshot if necessary.  For cross compilation you should either
   # do without snapshots and take the performance hit or you should build a
@@ skipping 13 matching lines @@
       snapshot_cc = 'snapshot.cc'
     snapshot_obj = context.ConfigureObject(env, snapshot_cc, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
   library_objs = [non_snapshot_files, libraries_obj, experimental_libraries_obj, snapshot_obj]
   return (library_objs, d8_objs, [mksnapshot], preparser_objs)
 
 
 (library_objs, d8_objs, mksnapshot, preparser_objs) = ConfigureObjectFiles()
 Return('library_objs d8_objs mksnapshot preparser_objs')