From dcb7a9df9bce4eb941157aa4038cb48adfe7fe04 Mon Sep 17 00:00:00 2001
From: Chinmay Garde <chinmaygarde@google.com>
Date: Mon, 21 Mar 2016 17:45:47 -0700
Subject: [PATCH] The dynamic services SDK produces a fat Mach binary of x64
 and arm64 variants.

---
 sky/services/dynamic/BUILD.gn | 51 +++++++++++++++++++++++++++++++++-
 sky/tools/lipo.py             | 52 +++++++++++++++++++++++++++++++++++
 2 files changed, 102 insertions(+), 1 deletion(-)
 create mode 100755 sky/tools/lipo.py

diff --git a/sky/services/dynamic/BUILD.gn b/sky/services/dynamic/BUILD.gn
index c109c637a95..8be2b6ccaef 100644
--- a/sky/services/dynamic/BUILD.gn
+++ b/sky/services/dynamic/BUILD.gn
@@ -29,7 +29,7 @@ source_set("embedder") {
   ]
 }
 
-static_library("sdk_lib") {
+static_library("sdk_lib_single_arch") {
   output_name = "FlutterServices"
   complete_static_lib = true
 
@@ -48,3 +48,52 @@ static_library("sdk_lib") {
     "//mojo/public/platform/native:system",
   ]
 }
+
+
+group("sdk_lib") {
+  action("generate_fat_binary") {
+    stamp_file = "$root_out_dir/dynamic_service_dylib_lipo"
+    script = "//sky/tools/lipo.py"
+
+    device_target = ":sdk_lib_single_arch(//build/toolchain/mac:ios_clang_arm)"
+    sim_target = ":sdk_lib_single_arch(//build/toolchain/mac:clang_x64)"
+
+    device_binary = "$root_build_dir/obj/sky/services/dynamic/libFlutterServices.a"
+    sim_binary    = "$root_build_dir/clang_x64/obj/sky/services/dynamic/libFlutterServices.a"
+    fat_binary = "$root_out_dir/FlutterServicesIOS.a"
+
+    inputs = [
+      device_binary,
+      sim_binary,
+    ]
+
+    outputs = [
+      stamp_file,
+      fat_binary,
+    ]
+
+    args = [
+      "--stamp",
+      rebase_path(stamp_file),
+      "--path",
+      rebase_path(device_binary),
+      "--path",
+      rebase_path(sim_binary),
+      "--output",
+      rebase_path(fat_binary),
+    ]
+
+    deps = [
+      "$device_target",
+      "$sim_target",
+    ]
+  }
+
+  deps = []
+
+  if (is_ios) {
+    deps += [
+      ":generate_fat_binary",
+    ]
+  }
+}
diff --git a/sky/tools/lipo.py b/sky/tools/lipo.py
new file mode 100755
index 00000000000..abcc122ca92
--- /dev/null
+++ b/sky/tools/lipo.py
@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+# Copyright 2015 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.
+
+import argparse
+import subprocess
+import sys
+import os
+
+
+def MakeStamp(stamp_path):
+  dir_name = os.path.dirname(stamp_path)
+
+  if not os.path.isdir(dir_name):
+    os.makedirs()
+
+  with open(stamp_path, 'a'):
+    os.utime(stamp_path, None)
+
+
+def main():
+  parser = argparse.ArgumentParser(
+      description='Creates a FAT Mach binary')
+
+  parser.add_argument('--path', action='append', dest='paths',
+      default=[], help='The path to a Mach binary')
+  parser.add_argument('--output', type=str)
+  parser.add_argument('--stamp', type=str)
+
+  args = parser.parse_args()
+
+  cmd = [
+    '/usr/bin/env',
+    'xcrun',
+    'lipo',
+  ]
+
+  cmd.extend(args.paths)
+
+  cmd.extend([
+    '-create',
+    '-output',
+    args.output,
+  ])
+
+  subprocess.check_call(cmd)
+
+  MakeStamp(args.stamp)
+
+if __name__ == '__main__':
+  sys.exit(main())