Platform and build updates for Android build

tools/gyp/v8.gyp

 # 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
@@ skipping 37 matching lines @@
     # probing when running on the target.
     'v8_can_use_vfp_instructions%': 'false',
 
     # Setting v8_use_arm_eabi_hardfloat to true will turn on V8 support for ARM
     # EABI calling convention where double arguments are passed in VFP
     # registers. Note that the GCC flag '-mfloat-abi=hard' should be used as
     # well when compiling for the ARM target.
     'v8_use_arm_eabi_hardfloat%': 'false',
 
     'v8_use_snapshot%': 'true',
+    'host_os%': '<(OS)',
     'v8_use_liveobjectlist%': 'false',
   },
   'conditions': [
     ['use_system_v8==0', {
       'target_defaults': {
         'defines': [
           'ENABLE_LOGGING_AND_PROFILING',
           'ENABLE_DEBUGGER_SUPPORT',
           'ENABLE_VMSTATE_TRACKING',
           'V8_FAST_TLS',
@@ skipping 252 matching lines @@
           ],
           'actions': [
             {
               'action_name': 'run_mksnapshot',
               'inputs': [
                 '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)mksnapshot<(EXECUTABLE_SUFFIX)',
               ],
               'outputs': [
                 '<(INTERMEDIATE_DIR)/snapshot.cc',
               ],
-              'action': ['<@(_inputs)', '<@(_outputs)'],
+              'variables': {
+                'mksnapshot_flags': [],
+              },
+              'conditions': [
+                ['v8_target_arch=="arm"', {
+                  # The following rules should be consistent with chromium's
+                  # common.gypi and V8's runtime rule to ensure they all generate
+                  # the same correct machine code. The following issue is about
+                  # V8's runtime rule about vfpv3 and neon:
+                  # http://code.google.com/p/v8/issues/detail?id=914
+                  'conditions': [
+                    ['armv7==1', {
+                      # The ARM Architecture Manual mandates VFPv3 if NEON is
+                      # available.
+                      # The current V8 doesn't use d16-d31, so for vfpv3-d16, we can
+                      # also enable vfp3 for the better performance.
+                      'conditions': [
+                        ['arm_neon!=1 and arm_fpu!="vfpv3" and arm_fpu!="vfpv3-d16"', {
+                          'variables': {
+                            'mksnapshot_flags': [
+                              '--noenable_vfp3',
+                            ],
+                          },
+                        }],
+                      ],
+                    },{ # else: armv7!=1
+                      'variables': {
+                        'mksnapshot_flags': [
+                          '--noenable_armv7',
+                          '--noenable_vfp3',
+                        ],
+                      },
+                    }],
+                  ],
+                }],
+              ],
+              'action': [
+                '<@(_inputs)',
+                '<@(mksnapshot_flags)',
+                '<@(_outputs)'
+              ],
             },
           ],
         },
         {
           'target_name': 'v8_nosnapshot',
           'type': '<(library)',
           'toolsets': ['host', 'target'],
           'dependencies': [
             'js2c#host',
             'v8_base',
@@ skipping 400 matching lines @@
                         '-lbz2',
                     ]}],
                   ],
                 },
                 'sources': [
                   '../../src/platform-linux.cc',
                   '../../src/platform-posix.cc'
                 ],
               }
             ],
+            ['OS=="android"', {
+                'sources': [
+                  '../../src/platform-posix.cc',
+                ],
+                'conditions': [
+                  ['host_os=="mac" and _toolset!="target"', {
+                    'sources': [
+                      '../../src/platform-macos.cc'
+                    ]
+                  }, {
+                    'sources': [
+                      '../../src/platform-linux.cc'
+                    ]
+                  }],
+                  ['_toolset=="target"', {
+                    'link_settings': {
+                      'libraries': [
+                        '-llog',
+                       ],
+                     }
+                  }],
+                ],
+              },
+            ],
             ['OS=="freebsd"', {
                 'link_settings': {
                   'libraries': [
                     '-L/usr/local/lib -lexecinfo',
                 ]},
                 'sources': [
                   '../../src/platform-freebsd.cc',
                   '../../src/platform-posix.cc'
                 ],
               }
@@ skipping 158 matching lines @@
           'target_name': 'v8_shell',
           'type': 'none',
           'dependencies': [
             'v8'
           ],
         },
       ],
     }],
   ],
 }