Enable x64 build of host toolset

icu.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     'icu.gypi',
   ],
   'variables': {
     'use_system_icu%': 0,
@@ skipping 25 matching lines @@
           ['_toolset=="host"', {
             'cflags': [ '-m32' ],
             'ldflags': [ '-m32' ],
             'asflags': [ '-32' ],
             'xcode_settings': {
               'ARCHS': [ 'i386' ],
             },
           }],
         ],
       }],
+      ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
+         or OS=="netbsd" or OS=="mac" or OS=="android" or OS=="qnx") and \
+        (target_arch=="arm64" or target_arch=="x64" or \
+         target_arch=="mipsel64")', {
+        'target_conditions': [
+          ['_toolset=="host"', {
+            'cflags': [ '-m64' ],
+            'ldflags': [ '-m64' ],
+            'asflags': [ '-64' ],
+            'xcode_settings': {
+              'ARCHS': [ 'x86_64' ],
+            },
+          }],
+        ],
+      }],
     ],
     'include_dirs': [
       'source/common',
       'source/i18n',
     ],
     'msvs_disabled_warnings': [4005, 4068, 4355, 4996, 4267],
   },
   'conditions': [
     ['use_system_icu==0 or want_separate_host_toolset==1', {
       'targets': [
@@ skipping 31 matching lines @@
                     'windows/icudt.dll',
                   ],
                 },
               ],
             }],
             [ 'icu_use_data_file_flag==1', {
               # Remove any assembly data file.
               'sources/': [['exclude', 'icudt46l_dat']],
               # Compile in the stub data symbol.
               'sources': ['source/stubdata/stubdata.c'],
-             
+
               # Make sure any binary depending on this gets the data file.
               'conditions': [
                 ['OS != "ios"', {
                   'copies': [{
                     'destination': '<(PRODUCT_DIR)',
                     'conditions': [
                       ['OS == "android"', {
                         'files': [
                           'android/icudtl.dat',
                         ],
                       } , { # else: OS != android
                         'files': [
                           'source/data/in/icudtl.dat',
                         ],
                       }],
                     ],
                   }],
                 } , { # else: OS=="ios"
                   'link_settings': {
                     'mac_bundle_resources': [
                       'source/data/in/icudtl.dat',
                     ],
                   },
                 }], # OS!=ios
               ], # conditions
-            }], # icu_use_data_file_flag 
+            }], # icu_use_data_file_flag
           ], # conditions
           'target_conditions': [
             [ 'OS == "win" or OS == "mac" or OS == "ios" or '
               '(OS == "android" and (_toolset != "host" or host_os != "linux")) or '
               '(OS == "qnx" and (_toolset == "host" and host_os != "linux"))', {
               'sources!': ['linux/icudt46l_dat.S'],
             }],
             [ 'OS != "android" or _toolset == "host"', {
               'sources!': ['android/icudt46l_dat.S'],
             }],
@@ skipping 446 matching lines @@
           },
           'includes': [
             '../../build/shim_headers.gypi',
           ],
           'toolsets': ['target'],
         },
       ], # targets
     }],
   ], # conditions
 }