Separate native and interpreted regexp by compile time flag, not runtime.

SConstruct

 # Copyright 2008 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 77 matching lines @@
                      '-Wl,--gc-sections',
                      '-Wl,-z,nocopyreloc',
                      '-Wl,-rpath-link=' + ANDROID_TOP + '/out/target/product/generic/obj/lib',
                      ANDROID_TOP + '/out/target/product/generic/obj/lib/crtbegin_dynamic.o',
                      ANDROID_TOP + '/prebuilt/linux-x86/toolchain/arm-eabi-4.2.1/lib/gcc/arm-eabi/4.2.1/interwork/libgcc.a',
                      ANDROID_TOP + '/out/target/product/generic/obj/lib/crtend_android.o'];
 
 LIBRARY_FLAGS = {
   'all': {
     'CPPDEFINES':   ['ENABLE_LOGGING_AND_PROFILING'],
-    'CPPPATH': [join(root_dir, 'src')]
+    'CPPPATH': [join(root_dir, 'src')],
+    'regexp:native': {
+      'arch:ia32' : {
+        'CPPDEFINES': ['V8_NATIVE_REGEXP']
+      }
+    }
   },
   'gcc': {
     'all': {
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
       'CXXFLAGS':     ['$CCFLAGS', '-fno-rtti', '-fno-exceptions'],
     },
     'mode:debug': {
       'CCFLAGS':      ['-g', '-O0'],
       'CPPDEFINES':   ['ENABLE_DISASSEMBLER', 'DEBUG'],
       'os:android': {
@@ skipping 430 matching lines @@
   'os': {
     'values': ['freebsd', 'linux', 'macos', 'win32', 'android'],
     'default': OS_GUESS,
     'help': 'the os to build for (' + OS_GUESS + ')'
   },
   'arch': {
     'values':['arm', 'ia32', 'x64'],
     'default': ARCH_GUESS,
     'help': 'the architecture to build for (' + ARCH_GUESS + ')'
   },
+  'regexp': {
+    'values': ['native', 'interpreted'],
+    'default': 'native',
+    'help': 'Whether to use native or interpreted regexp implementation'
+  },
   'snapshot': {
     'values': ['on', 'off', 'nobuild'],
     'default': 'off',
     'help': 'build using snapshots for faster start-up'
   },
   'prof': {
     'values': ['on', 'off', 'oprofile'],
     'default': 'off',
     'help': 'enable profiling of build target'
   },
@@ skipping 111 matching lines @@
       Abort("Illegal value for option %s '%s'." % (option, s))
       return False
   return True
 
 
 def VerifyOptions(env):
   if not IsLegal(env, 'mode', ['debug', 'release']):
     return False
   if not IsLegal(env, 'sample', ["shell", "process"]):
     return False
+  if not IsLegal(env, 'regexp', ["native", "interpreted"]):
+    return False
   if env['os'] == 'win32' and env['library'] == 'shared' and env['prof'] == 'on':
     Abort("Profiling on windows only supported for static library.")
   if env['prof'] == 'oprofile' and env['os'] != 'linux':
     Abort("OProfile is only supported on Linux.")
   if env['os'] == 'win32' and env['soname'] == 'on':
     Abort("Shared Object soname not applicable for Windows.")
   if env['soname'] == 'on' and env['library'] == 'static':
     Abort("Shared Object soname not applicable for static library.")
   for (name, option) in SIMPLE_OPTIONS.iteritems():
     if (not option.get('default')) and (name not in ARGUMENTS):
@@ skipping 236 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()