Enable Native Client build of V8.

build/common.gypi

 # Copyright 2012 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 17 matching lines @@
 # Shared definitions for all V8-related targets.
 
 {
   'variables': {
     'use_system_v8%': 0,
     'msvs_use_common_release': 0,
     'gcc_version%': 'unknown',
     'CXX%': '${CXX:-$(which g++)}',  # Used to assemble a shell command.
     'v8_compress_startup_data%': 'off',
     'v8_target_arch%': '<(target_arch)',
+    # Native Client builds currently use the V8 ARM JIT and
+    # arm/simulator-arm.cc to defer the significant effort required
+    # for NaCl JIT support. The nacl_target_arch variable provides
+    # the 'true' target arch for places in this file that need it.
+    # TODO(bradchen): get rid of nacl_target_arch when someday
+    # NaCl V8 builds stop using the ARM simulator
+    'nacl_target_arch%': 'none',     # must be set externally
 
     # Setting 'v8_can_use_unaligned_accesses' to 'true' will allow the code
     # generated by V8 to do unaligned memory access, and setting it to 'false'
     # will ensure that the generated code will always do aligned memory
     # accesses. The default value of 'default' will try to determine the correct
     # setting. Note that for Intel architectures (ia32 and x64) unaligned memory
     # access is allowed for all CPUs.
     'v8_can_use_unaligned_accesses%': 'default',
 
     # Setting 'v8_can_use_vfp2_instructions' to 'true' will enable use of ARM VFP
@@ skipping 265 matching lines @@
             'xcode_settings': {
               'ARCHS': [ 'i386' ],
             },
           }],
           ['_toolset=="target"', {
             'variables': {
               'm32flag': '<!((echo | $(echo ${CXX_target:-<(CXX)}) -m32 -E - > /dev/null 2>&1) && echo "-m32" || true)',
               'clang%': 0,
             },
             'conditions': [
-              ['OS!="android" or clang==1', {
+              ['(OS!="android" or clang==1) and \
+                nacl_target_arch!="nacl_x64"', {
                 'cflags': [ '<(m32flag)' ],
                 'ldflags': [ '<(m32flag)' ],
               }],
             ],
             'xcode_settings': {
               'ARCHS': [ 'i386' ],
             },
           }],
         ],
       }],
@@ skipping 129 matching lines @@
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }