Add support for startup data (snapshot) compression.

SConstruct

 # Copyright 2010 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 183 matching lines @@
         'CPPDEFINES':    ['__mips_soft_float=1'],
       }
     },
     'arch:x64': {
       'CPPDEFINES':   ['V8_TARGET_ARCH_X64'],
       'CCFLAGS':      ['-m64'],
       'LINKFLAGS':    ['-m64'],
     },
     'gdbjit:on': {
       'CPPDEFINES':   ['ENABLE_GDB_JIT_INTERFACE']
+    },
+    'compress_startup_data:bz2': {
+      'CPPDEFINES':   ['COMPRESS_STARTUP_DATA_BZ2']
     }
   },
   'msvc': {
     'all': {
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
       'CXXFLAGS':     ['$CCFLAGS', '/GR-', '/Gy'],
       'CPPDEFINES':   ['WIN32'],
       'LINKFLAGS':    ['/INCREMENTAL:NO', '/NXCOMPAT', '/IGNORE:4221'],
       'CCPDBFLAGS':   ['/Zi']
     },
@@ skipping 116 matching lines @@
     },
     'os:solaris': {
       'LIBS': ['m', 'pthread', 'socket', 'nsl', 'rt'],
       'LINKFLAGS': ['-mt']
     },
     'os:openbsd': {
       'LIBS': ['execinfo', 'pthread']
     },
     'os:win32': {
       'LIBS': ['winmm', 'ws2_32'],
     },

[Søren Thygesen Gjesse, 2011/04/29 06:50:29]

As this is Linux only I think this should be either inside the os:linux section
above or have a 'os:linux' inside. I think an os:linux here is the best choice,
and makes adding more platforms most logical.

[mnaganov (inactive), 2011/04/29 12:07:58]

Done.

+    'compress_startup_data:bz2': {
+      'LIBS': ['bz2']
+    },
   },
   'msvc': {
     'all': {
       'CPPDEFINES': ['_HAS_EXCEPTIONS=0'],
       'LIBS': ['winmm', 'ws2_32']
     }
   }
 }
 
 
@@ skipping 120 matching lines @@
       'CCFLAGS':      ['-m32'],
       'LINKFLAGS':    ['-m32']
     },
     'mode:release': {
       'CCFLAGS':      ['-O2']
     },
     'mode:debug': {
       'CCFLAGS':      ['-g', '-O0'],
       'CPPDEFINES':   ['DEBUG']
     },
+    'compress_startup_data:bz2': {
+      'CPPDEFINES':   ['COMPRESS_STARTUP_DATA_BZ2'],

[Søren Thygesen Gjesse, 2011/04/29 06:50:29]

Ditto for the LIBS part.

[mnaganov (inactive), 2011/04/29 12:07:58]

Done.

+      'LIBS':         ['bz2']
+    },
   },
   'msvc': {
     'all': {
       'LIBS': ['winmm', 'ws2_32']
     },
     'verbose:off': {
       'CCFLAGS': ['/nologo'],
       'LINKFLAGS': ['/NOLOGO']
     },
     'verbose:on': {
@@ skipping 421 matching lines @@
   },
   'mipsabi': {
     'values': ['hardfloat', 'softfloat', 'none'],
     'default': 'hardfloat',
     'help': 'generate calling conventiont according to selected mips ABI'
   },
   'mips_arch_variant': {
     'values': ['mips32r2', 'mips32r1'],
     'default': 'mips32r2',
     'help': 'mips variant'
-  }
+  },
+  'compress_startup_data': {
+    'values': ['off', 'bz2'],
+    'default': 'off',
+    'help': 'compress startup data (snapshot) [Linux only]'
+  },
 }
 
 ALL_OPTIONS = dict(PLATFORM_OPTIONS, **SIMPLE_OPTIONS)
 
 
 def AddOptions(options, result):
   guess_env = Environment(options=result)
   for (name, option) in options.iteritems():
     if 'guess' in option:
       # Option has a guess function
@@ skipping 102 matching lines @@
   if env['soname'] == 'on' and env['library'] == 'static':
     Abort("Shared Object soname not applicable for static library.")
   if env['os'] != 'win32' and env['pgo'] != 'off':
     Abort("Profile guided optimization only supported on Windows.")
   if env['cache'] and not os.path.isdir(env['cache']):
     Abort("The specified cache directory does not exist.")
   if not (env['arch'] == 'arm' or env['simulator'] == 'arm') and ('unalignedaccesses' in ARGUMENTS):
     print env['arch']
     print env['simulator']
     Abort("Option unalignedaccesses only supported for the ARM architecture.")
+  if env['os'] != 'linux' and env['compress_startup_data'] != 'off':
+    Abort("Startup data compression is only available on Linux")
   for (name, option) in ALL_OPTIONS.iteritems():
     if (not name in env):
       message = ("A value for option %s must be specified (%s)." %
           (name, ", ".join(option['values'])))
       Abort(message)
     if not env[name] in option['values']:
       message = ("Unknown %s value '%s'.  Possible values are (%s)." %
           (name, env[name], ", ".join(option['values'])))
       Abort(message)
 
@@ skipping 298 matching lines @@
 # version of scons.  Also, there's a bug in some revisions that
 # doesn't allow this flag to be set, so we swallow any exceptions.
 # Lovely.
 try:
   SetOption('warn', 'no-deprecated')
 except:
   pass
 
 
 Build()