Build 64bit browser for Android with clang for ARMv8

build/config/android/config.gni

 # Copyright 2014 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.
 
 # This file contains common system config stuff for the Android build.
 
 if (is_android) {
   assert(rebase_path("//", root_build_dir) == "../../",
          "Android output directory must be nested 2 levels within src/ (" +
              "e.g.: out-gn/Debug). http://crbug.com/412935")
@@ skipping 228 matching lines @@
     if (arm_version < 7) {
       android_app_abi = "armeabi"
     } else {
       android_app_abi = "armeabi-v7a"
     }
   } else if (current_cpu == "mipsel") {
     android_app_abi = "mips"
   } else if (current_cpu == "x64") {
     android_app_abi = "x86_64"
   } else if (current_cpu == "arm64") {
+    import("//build/config/arm.gni")

[Nico, 2016/04/14 15:43:55]

why is this needed?

[khasim.mohammed, 2016/04/14 16:13:41]

Because arm.gni has arm64 options for fpu :

else if (current_cpu == "arm64") {
  # arm64 supports only "hard".
  arm_float_abi = "hard"
  arm_use_neon = true
  arm_fpu = "cortex-a57+simd+crypto+fp+crc"
}

     android_app_abi = "arm64-v8a"
   } else if (current_cpu == "mips64el") {
     android_app_abi = "mips64"
   } else {
     assert(false, "Unknown Android ABI: " + current_cpu)
   }
 }