Contribution of PowerPC port.

build/toolchain.gypi

 # Copyright 2013 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 82 matching lines @@
 
     'variables': {
       # This is set when building the Android WebView inside the Android build
       # system, using the 'android' gyp backend.
       'android_webview_build%': 0,
     },
     # Copy it out one scope.
     'android_webview_build%': '<(android_webview_build)',
   },
   'conditions': [
-    ['host_arch=="ia32" or host_arch=="x64" or clang==1', {
+    ['host_arch=="ia32" or host_arch=="x64" or \
+      host_arch=="ppc" or host_arch=="ppc64" or \
+      clang==1', {
       'variables': {
         'host_cxx_is_biarch%': 1,
        },
      }, {
       'variables': {
         'host_cxx_is_biarch%': 0,
       },
     }],
     ['target_arch=="ia32" or target_arch=="x64" or target_arch=="x87" or \
+      target_arch=="ppc" or target_arch=="ppc64" or \
       clang==1', {
       'variables': {
         'target_cxx_is_biarch%': 1,
        },
      }, {
       'variables': {
         'target_cxx_is_biarch%': 0,
       },
     }],
   ],
@@ skipping 120 matching lines @@
               }],
             ],
           }],  # _toolset=="target"
         ],
       }],  # v8_target_arch=="arm"
       ['v8_target_arch=="arm64"', {
         'defines': [
           'V8_TARGET_ARCH_ARM64',
         ],
       }],
+      ['v8_target_arch=="ppc" or v8_target_arch=="ppc64"', {
+        'defines': [
+          'V8_TARGET_ARCH_PPC',
+        ],
+        'conditions': [
+          ['v8_target_arch=="ppc64"', {
+            'defines': [
+              'V8_TARGET_ARCH_PPC64',
+            ],
+          }],
+          ['v8_host_byteorder=="little"', {
+            'defines': [
+              'V8_TARGET_ARCH_PPC_LE',
+            ],
+          }],
+          ['v8_host_byteorder=="big"', {
+            'defines': [
+              'V8_TARGET_ARCH_PPC_BE',
+            ],
+          }],
+        ],
+      }],  # ppc
       ['v8_target_arch=="ia32"', {
         'defines': [
           'V8_TARGET_ARCH_IA32',
         ],
       }],  # v8_target_arch=="ia32"
       ['v8_target_arch=="x87"', {
         'defines': [
           'V8_TARGET_ARCH_X87',
         ],
         'cflags': ['-march=i586'],
@@ skipping 320 matching lines @@
         'msvs_settings': {
           'VCLinkerTool': {
             'GenerateMapFile': 'true',
           },
         },
       }],
       ['(OS=="linux" or OS=="freebsd"  or OS=="openbsd" or OS=="solaris" \
          or OS=="netbsd" or OS=="mac" or OS=="android" or OS=="qnx") and \
         (v8_target_arch=="arm" or v8_target_arch=="ia32" or \
          v8_target_arch=="x87" or v8_target_arch=="mips" or \
-         v8_target_arch=="mipsel")', {
+         v8_target_arch=="mipsel" or v8_target_arch=="ppc")', {
         'target_conditions': [
           ['_toolset=="host"', {
             'conditions': [
               ['host_cxx_is_biarch==1', {
                 'cflags': [ '-m32' ],
                 'ldflags': [ '-m32' ]
               }],
             ],
             'xcode_settings': {
               'ARCHS': [ 'i386' ],
             },
           }],
           ['_toolset=="target"', {
             'conditions': [
               ['target_cxx_is_biarch==1 and nacl_target_arch!="nacl_x64"', {
                 'cflags': [ '-m32' ],
                 'ldflags': [ '-m32' ],
               }],
             ],
             'xcode_settings': {
               'ARCHS': [ 'i386' ],
             },
           }],
         ],
       }],
       ['(OS=="linux" or OS=="android") and \
-        (v8_target_arch=="x64" or v8_target_arch=="arm64")', {
+        (v8_target_arch=="x64" or v8_target_arch=="arm64" or \
+         v8_target_arch=="ppc64")', {
         'target_conditions': [
           ['_toolset=="host"', {
             'conditions': [
               ['host_cxx_is_biarch==1', {
                 'cflags': [ '-m64' ],
                 'ldflags': [ '-m64' ]
               }],
              ],
            }],
            ['_toolset=="target"', {
@@ skipping 320 matching lines @@
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }