Refactor .gyp files:

build/standalone.gypi

 # 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
 #       with the distribution.
 #     * Neither the name of Google Inc. nor the names of its
 #       contributors may be used to endorse or promote products derived
 #       from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# Definitions to be used when building stand-alone V8 binaries.
+
 {
   'variables': {
     'library%': 'static_library',
     'component%': 'static_library',
     'visibility%': 'hidden',
     'msvs_multi_core_compile%': '1',
     'variables': {
       'variables': {
         'conditions': [
           [ 'OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
             # This handles the Linux platforms we generally deal with. Anything
             # else gets passed through, which probably won't work very well; such
             # hosts should pass an explicit target_arch to gyp.
             'host_arch%':
               '<!(uname -m | sed -e "s/i.86/ia32/;s/x86_64/x64/;s/amd64/x64/;s/arm.*/arm/")',
           }, {  # OS!="linux" and OS!="freebsd" and OS!="openbsd"
             'host_arch%': 'ia32',
           }],
         ],
       },
       'host_arch%': '<(host_arch)',
       'target_arch%': '<(host_arch)',
       'v8_target_arch%': '<(target_arch)',
     },
     'host_arch%': '<(host_arch)',
     'target_arch%': '<(target_arch)',
     'v8_target_arch%': '<(v8_target_arch)',
-    'v8_enable_debugger_support%': 1,
     'conditions': [
       ['(v8_target_arch=="arm" and host_arch!="arm") or \
         (v8_target_arch=="x64" and host_arch!="x64")', {
         'want_separate_host_toolset': 1,
       }, {
         'want_separate_host_toolset': 0,
       }],
     ],
   },
   'target_defaults': {
     'default_configuration': 'Debug',
-    'conditions': [
-      ['v8_enable_debugger_support==1', {
-          'defines': ['ENABLE_DEBUGGER_SUPPORT',],
-        },
-      ],
-    ],
     'configurations': {
       'Debug': {
         'cflags': [ '-g', '-O0' ],
-        'defines': [ 'ENABLE_DISASSEMBLER', 'DEBUG', 'V8_ENABLE_CHECKS',
-                     'OBJECT_PRINT' ],
-      },
-      'Release': {
-        'cflags': [ '-O3', '-fomit-frame-pointer', '-fdata-sections',
-                    '-ffunction-sections' ],
       },
     },
   },
   'conditions': [
     [ 'OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris"', {
       'target_defaults': {
         'cflags': [ '-Wall', '-Werror', '-W', '-Wno-unused-parameter',
                     '-Wnon-virtual-dtor', '-pthread', '-fno-rtti',
                     '-fno-exceptions', '-pedantic' ],
         'ldflags': [ '-pthread', ],
@@ skipping 17 matching lines @@
           'WIN32',
           '_CRT_SECURE_NO_DEPRECATE',
           '_CRT_NONSTDC_NO_DEPRECATE',
         ],
         'conditions': [
           ['component=="static_library"', {
             'defines': [
               '_HAS_EXCEPTIONS=0',
             ],
           }],
-        ],        
+        ],
         'msvs_cygwin_dirs': ['<(DEPTH)/third_party/cygwin'],
         'msvs_disabled_warnings': [4355, 4800],
         'msvs_settings': {
           'VCCLCompilerTool': {
             'MinimalRebuild': 'false',
             'BufferSecurityCheck': 'true',
             'EnableFunctionLevelLinking': 'true',
             'RuntimeTypeInfo': 'false',
             'WarningLevel': '3',
             'WarnAsError': 'true',
@@ skipping 69 matching lines @@
         },
         'target_conditions': [
           ['_type!="static_library"', {
             'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-search_paths_first']},
           }],
         ],  # target_conditions
       },  # target_defaults
     }],  # OS=="mac"
   ],
 }