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diff -ur node-v12.3.1/deps/v8/src/arm64/cpu-arm64.cc node-v12.3.1+iPhone/deps/v8/src/arm64/cpu-arm64.cc
--- node-v12.3.1/deps/v8/src/arm64/cpu-arm64.cc	2019-05-22 12:21:52.000000000 +0000
+++ node-v12.3.1+iPhone/deps/v8/src/arm64/cpu-arm64.cc	2019-05-24 19:37:47.406732128 +0000
@@ -15,7 +15,7 @@
 class CacheLineSizes {
  public:
   CacheLineSizes() {
-#if !defined(V8_HOST_ARCH_ARM64) || defined(V8_OS_WIN)
+#if !defined(V8_HOST_ARCH_ARM64) || defined(V8_OS_WIN) || defined(V8_OS_IPHONEOS) || defined(__IPHONEOS__)
     cache_type_register_ = 0;
 #else
     // Copy the content of the cache type register to a core register.
diff -ur node-v12.3.1/deps/v8/src/base/platform/platform-posix.cc node-v12.3.1+iPhone/deps/v8/src/base/platform/platform-posix.cc
--- node-v12.3.1/deps/v8/src/base/platform/platform-posix.cc	2019-05-22 12:21:52.000000000 +0000
+++ node-v12.3.1+iPhone/deps/v8/src/base/platform/platform-posix.cc	2019-05-24 19:40:15.582804009 +0000
@@ -240,6 +240,8 @@
   // 42 bits of virtual addressing. Truncate to 40 bits to allow kernel chance
   // to fulfill request.
   raw_addr &= uint64_t{0xFFFFFF0000};
+#elif V8_TARGET_ARCH_ARM64
+  raw_addr = raw_addr >> 14 << 14;
 #else
   raw_addr &= 0x3FFFF000;
 
diff -ur node-v12.3.1/tools/v8_gypfiles/toolchain.gypi node-v12.3.1+iPhone/tools/v8_gypfiles/toolchain.gypi
--- node-v12.3.1/tools/v8_gypfiles/toolchain.gypi	2019-05-22 12:21:55.000000000 +0000
+++ node-v12.3.1+iPhone/tools/v8_gypfiles/toolchain.gypi	2019-05-24 19:35:58.206678803 +0000
@@ -84,7 +84,9 @@
     # The setting is ignored if want_separate_host_toolset is 0.
     'v8_toolset_for_shell%': 'target',
 
-    'host_os%': '<(OS)',
+    # 'host_os%': '<(OS)',
+    'host_os%': "<!(uname -s | sed -e 's/Linux/linux/;s/Darwin/mac/')",
+
     'werror%': '-Werror',
     # For a shared library build, results in "libv8-<(soname_version).so".
     'soname_version%': '',
@@ -371,7 +373,7 @@
                   [ 'clang==1', {
                     'cflags': ['-integrated-as'],
                   }],
-                  ['OS!="mac"', {
+                  ['OS!="mac" or OS!="ios"', {
                     'defines': ['_MIPS_TARGET_HW',],
                   }, {
                     'defines': ['_MIPS_TARGET_SIMULATOR',],
@@ -384,7 +386,7 @@
           }],  #'_toolset=="target"
           ['_toolset=="host"', {
             'conditions': [
-              ['v8_target_arch==target_arch and OS!="mac"', {
+              ['v8_target_arch==target_arch and OS!="mac" or OS!="ios"', {
                 'defines': ['_MIPS_TARGET_HW',],
               }, {
                 'defines': ['_MIPS_TARGET_SIMULATOR',],
@@ -1025,7 +1027,7 @@
         },
       }],
       ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
-         or OS=="netbsd" or OS=="mac" or OS=="android" or OS=="qnx") and \
+         or OS=="netbsd" or OS=="mac" or OS=="ios" or OS=="android" or OS=="qnx") and \
         v8_target_arch=="ia32"', {
         'cflags': [
           '-msse2',
@@ -1034,7 +1036,7 @@
         ],
       }],
       ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
-         or OS=="netbsd" or OS=="mac" or OS=="android" or OS=="qnx") and \
+         or OS=="netbsd" or OS=="mac" or OS=="ios" or OS=="android" or OS=="qnx") and \
         (v8_target_arch=="arm" or v8_target_arch=="ia32" or \
          v8_target_arch=="mips" or v8_target_arch=="mipsel" or \
          v8_target_arch=="ppc" or v8_target_arch=="s390")', {
@@ -1235,7 +1237,7 @@
                   '-ffunction-sections',
                 ],
               }],
-              ['OS=="mac"', {
+              ['OS=="mac" or OS=="ios"', {
                 'xcode_settings': {
                   'GCC_OPTIMIZATION_LEVEL': '0',  # -O0
                 },
@@ -1296,7 +1298,7 @@
                    }],
                 ],
               }],
-              ['OS=="mac"', {
+              ['OS=="mac" or OS=="ios"', {
                 'xcode_settings': {
                   'GCC_OPTIMIZATION_LEVEL': '3',  # -O3
                   'GCC_STRICT_ALIASING': 'YES',
@@ -1356,7 +1358,7 @@
               '-O2',
             ],
           }],
-          ['OS=="mac"', {
+          ['OS=="mac" or OS=="ios"', {
             'xcode_settings': {
               'GCC_OPTIMIZATION_LEVEL': '3',  # -O3
 
diff -ur node-v12.3.1/tools/v8_gypfiles/v8.gyp node-v12.3.1+iPhone/tools/v8_gypfiles/v8.gyp
--- node-v12.3.1/tools/v8_gypfiles/v8.gyp	2019-05-22 12:21:55.000000000 +0000
+++ node-v12.3.1+iPhone/tools/v8_gypfiles/v8.gyp	2019-05-24 19:45:01.650941667 +0000
@@ -123,6 +123,12 @@
             ],
           },
           'conditions': [
+            ['OS=="ios"', {
+              'ldflags': [
+                '-dynamiclib',
+                '-all_load'
+              ],
+            }],
             ['OS=="mac"', {
               'xcode_settings': {
                 'OTHER_LDFLAGS': ['-dynamiclib', '-all_load']
@@ -2221,7 +2227,7 @@
         }],
       ],
       'conditions': [
-        ['OS=="linux"', {
+        ['OS=="linux" or (host_os=="linux" and _toolset=="host")', {
             'link_settings': {
               'libraries': [
                 '-ldl',
@@ -2296,15 +2302,37 @@
             '<(V8_ROOT)/src/base/platform/platform-fuchsia.cc',
           ]},
         ],
-        ['OS=="mac"', {
+        ['OS=="mac" or OS=="ios"', {
           'sources': [
             '<(V8_ROOT)/src/base/debug/stack_trace_posix.cc',
-            '<(V8_ROOT)/src/base/platform/platform-macos.cc',
             '<(V8_ROOT)/src/base/platform/platform-posix.cc',
             '<(V8_ROOT)/src/base/platform/platform-posix.h',
             '<(V8_ROOT)/src/base/platform/platform-posix-time.cc',
             '<(V8_ROOT)/src/base/platform/platform-posix-time.h',
-          ]},
+          ],
+          'conditions': [
+            ['(host_os=="mac" and _toolset=="host") or _toolset=="target"', {
+              'sources': [
+                '<(V8_ROOT)/src/base/platform/platform-macos.cc',
+              ]
+            }, {
+              'sources': [
+                '<(V8_ROOT)/src/base/platform/platform-linux.cc',
+              ]
+            }]
+          ],
+          'link_settings': {
+            'target_conditions': [
+              ['_toolset=="host" and host_os!="mac"', {
+                'libraries': [
+                  '-ldl',
+                  '-lpthread',
+                  '-lrt'
+                ]
+              }]
+            ]
+          },
+         },
         ],
         ['OS=="win"', {
           'defines': [