Add (mostly Chromium-compatible) V8_OS_* defines to v8.gyp.

tools/gyp/v8.gyp

 # 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 669 matching lines @@
         ['OS=="linux"', {
             'link_settings': {
               'conditions': [
                 ['v8_compress_startup_data=="bz2"', {
                   'libraries': [
                     '-lbz2',
                   ]
                 }],
               ],
             },
+            'defines': [
+              'V8_OS_LINUX=1',
+              'V8_OS_POSIX=1'
+            ],
             'sources': [  ### gcmole(os:linux) ###
               '../../src/platform-linux.cc',
               '../../src/platform-posix.cc'
             ],
           }
         ],
         ['OS=="android"', {
             'defines': [
               'CAN_USE_VFP_INSTRUCTIONS',
             ],
             'sources': [
               '../../src/platform-posix.cc',
             ],
             'conditions': [
               ['host_os=="mac"', {
                 'target_conditions': [
                   ['_toolset=="host"', {
+                    'defines': [
+                      'V8_OS_BSD=1',
+                      'V8_OS_MACOSX=1',
+                      'V8_OS_POSIX=1'
+                    ],
                     'sources': [
                       '../../src/platform-macos.cc'
                     ]
                   }, {
+                    'defines': [
+                      'V8_OS_LINUX=1',
+                      'V8_OS_POSIX=1'
+                    ],
                     'sources': [
                       '../../src/platform-linux.cc'
                     ]
                   }],
                 ],
               }, {
+                'defines': [
+                  'V8_OS_LINUX=1',
+                  'V8_OS_POSIX=1'
+                ],
                 'sources': [
                   '../../src/platform-linux.cc'
                 ]
               }],
             ],
           },
         ],
         ['OS=="freebsd"', {
+            'defines': [
+              'V8_OS_BSD=1',
+              'V8_OS_FREEBSD=1',
+              'V8_OS_POSIX=1'
+            ],
             'link_settings': {
               'libraries': [
                 '-L/usr/local/lib -lexecinfo',
             ]},
             'sources': [
               '../../src/platform-freebsd.cc',
               '../../src/platform-posix.cc'
             ],
           }
         ],
         ['OS=="openbsd"', {
+            'defines': [
+              'V8_OS_BSD=1',
+              'V8_OS_OPENBSD=1',
+              'V8_OS_POSIX=1'
+            ],
             'link_settings': {
               'libraries': [
                 '-L/usr/local/lib -lexecinfo',
             ]},
             'sources': [
               '../../src/platform-openbsd.cc',
               '../../src/platform-posix.cc'
             ],
           }
         ],
         ['OS=="netbsd"', {
+            'defines': [
+              'V8_OS_BSD=1',
+              'V8_OS_NETBSD=1',
+              'V8_OS_POSIX=1'
+            ],
             'link_settings': {
               'libraries': [
                 '-L/usr/pkg/lib -Wl,-R/usr/pkg/lib -lexecinfo',
             ]},
             'sources': [
               '../../src/platform-openbsd.cc',
               '../../src/platform-posix.cc'
             ],
           }
         ],
         ['OS=="solaris"', {
+            'defines': [
+              'V8_OS_POSIX=1',
+              'V8_OS_SOLARIS=1'
+            ],
             'link_settings': {
               'libraries': [
                 '-lsocket -lnsl',
             ]},
             'sources': [
               '../../src/platform-solaris.cc',
               '../../src/platform-posix.cc',
             ],
           }
         ],
         ['OS=="mac"', {
+          'defines': [
+            'V8_OS_BSD=1',
+            'V8_OS_MACOSX=1',
+            'V8_OS_POSIX=1'
+          ],
           'sources': [
             '../../src/platform-macos.cc',
             '../../src/platform-posix.cc'
           ]},
         ],
         ['OS=="win"', {
           'variables': {
             'gyp_generators': '<!(echo $GYP_GENERATORS)',
           },
           'conditions': [
             ['gyp_generators=="make"', {
               'variables': {
                 'build_env': '<!(uname -o)',
               },
               'conditions': [
                 ['build_env=="Cygwin"', {
+                  'defines': [
+                    'V8_OS_CYGWIN=1',
+                    'V8_OS_POSIX=1'
+                  ],
                   'sources': [
                     '../../src/platform-cygwin.cc',
                     '../../src/platform-posix.cc',
                   ],
                 }, {
+                  'defines': [
+                    'V8_OS_WIN=1'
+                  ],
                   'sources': [
                     '../../src/platform-win32.cc',
                     '../../src/win32-math.h',
                     '../../src/win32-math.cc',
                   ],
                 }],
               ],
               'link_settings':  {
                 'libraries': [ '-lwinmm', '-lws2_32' ],
               },
             }, {
+              'defines': [
+                'V8_OS_WIN=1'
+              ],
               'sources': [
                 '../../src/platform-win32.cc',
                 '../../src/win32-math.h',
                 '../../src/win32-math.cc',
               ],
               'msvs_disabled_warnings': [4351, 4355, 4800],
               'link_settings':  {
                 'libraries': [ '-lwinmm.lib', '-lws2_32.lib' ],
               },
             }],
@@ skipping 221 matching lines @@
         }],
         ['v8_compress_startup_data=="bz2"', {
           'libraries': [
             '-lbz2',
           ]
         }],
       ],
     },
   ],
 }