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

tools/gyp/v8.gyp

 # Copyright 2009 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 401 matching lines @@
           'action': ['python', '../../tools/js2c.py', '<@(_outputs)', 'D8', '<@(library_files)'],
         },
       ],
     },
 
     # Targets to build v8 for the native architecture (ia32).
     {
       'target_name': 'v8_base',
       'type': '<(library)',
       'defines': [
-        'V8_TARGET_ARCH_IA32'
+        'V8_TARGET_ARCH_IA32',
+        'V8_NATIVE_REGEXP'
       ],
       'include_dirs+': [
         '../../src',
         '../../src/ia32',
       ],
       'msvs_guid': 'EC8B7909-62AF-470D-A75D-E1D89C837142',
       'sources': [
         '<@(base_source_files)',
       ],
       'sources!': [
@@ skipping 37 matching lines @@
           'link_settings':  {
             'libraries': [ '-lwinmm.lib' ],
           },
         }],
       ],
     },
     {
       'target_name': 'v8_nosnapshot',
       'type': '<(library)',
       'defines': [
-        'V8_TARGET_ARCH_IA32'
+        'V8_TARGET_ARCH_IA32',
+        'V8_NATIVE_REGEXP'
       ],
       'dependencies': [
         'js2c',
         'v8_base',
       ],
       'include_dirs': [
         '../../src',
       ],
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/libraries.cc',
@@ skipping 11 matching lines @@
       ],
       'msvs_guid': '865575D0-37E2-405E-8CBA-5F6C485B5A26',
       'sources': [
         '../../src/mksnapshot.cc',
       ],
     },
     {
       'target_name': 'v8',
       'type': '<(library)',
       'defines': [
-        'V8_TARGET_ARCH_IA32'
+        'V8_TARGET_ARCH_IA32',
+        'V8_NATIVE_REGEXP'
       ],
       'dependencies': [
         'js2c',
         'mksnapshot',
         'v8_base',
       ],
       'msvs_guid': '21E22961-22BF-4493-BD3A-868F93DA5179',
       'actions': [
         {
           'action_name': 'mksnapshot',
@@ skipping 19 matching lines @@
         ],
       },
       'export_dependent_settings': [
         'v8_base',
       ],
     },
     {
       'target_name': 'v8_shell',
       'type': 'executable',
       'defines': [
-        'V8_TARGET_ARCH_IA32'
+        'V8_TARGET_ARCH_IA32',
+        'V8_NATIVE_REGEXP'
       ],
       'dependencies': [
         'v8',
       ],
       'sources': [
         '../../samples/shell.cc',
       ],
       'conditions': [
         [ 'OS=="win"', {
           # This could be gotten by not setting chromium_code, if that's OK.
           'defines': ['_CRT_SECURE_NO_WARNINGS'],
         }],
       ],
     },
   ],
 
   'conditions': [ ['OS=="mac"', { 'targets': [
     # TODO(bradnelson):  temporarily disable 'd8' target on Windows while
     # we work fix the performance regressions.
     # TODO(sgk):  temporarily disable 'd8' target on Linux while
     # we work out getting the readline library on all the systems.
     {
       'target_name': 'd8',
       'type': 'executable',
       'dependencies': [
         'd8_js2c',
         'v8',
       ],
       'defines': [
-        'V8_TARGET_ARCH_IA32'
+        'V8_TARGET_ARCH_IA32',
+        'V8_NATIVE_REGEXP'
       ],
       'include_dirs': [
         '../../src',
       ],
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/d8-js.cc',
         '<@(d8_source_files)',
       ],
       'conditions': [
         [ 'OS=="linux"', {
@@ skipping 140 matching lines @@
         ],
         'msvs_settings': {
           'VCLinkerTool': {
             'AdditionalOptions': '/IGNORE:4221 /NXCOMPAT',
           },
         },
       },
     }],
   ],
 }