Add cmake file for arm64-android-clang
Build for ARM64 for android:
cmake /path/to/aom -DAOM_ANDROID_NDK_PATH=/path/to/ndk \
-DCMAKE_TOOLCHAIN_FILE=\
"/path/to/aom/build/cmake/toolchains/arm64-android-clang.cmake"
Change-Id: Ibd8093f11c9765a18d7f89bc3ea84047f81892a5
diff --git a/build/cmake/toolchains/arm64-android-clang.cmake b/build/cmake/toolchains/arm64-android-clang.cmake
new file mode 100644
index 0000000..28b9ae5
--- /dev/null
+++ b/build/cmake/toolchains/arm64-android-clang.cmake
@@ -0,0 +1,46 @@
+#
+# Copyright (c) 2019, Alliance for Open Media. All rights reserved
+#
+# This source code is subject to the terms of the BSD 2 Clause License and the
+# Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License was
+# not distributed with this source code in the LICENSE file, you can obtain it
+# at www.aomedia.org/license/software. If the Alliance for Open Media Patent
+# License 1.0 was not distributed with this source code in the PATENTS file, you
+# can obtain it at www.aomedia.org/license/patent.
+#
+if(AOM_BUILD_CMAKE_TOOLCHAINS_ARM64_ANDROID_CLANG_CMAKE_)
+ return()
+endif() # AOM_BUILD_CMAKE_TOOLCHAINS_ARM64_ANDROID_CLANG_CMAKE_
+set(AOM_BUILD_CMAKE_TOOLCHAINS_ARM64_ANDROID_CLANG_CMAKE_ 1)
+
+if(NOT ANDROID_PLATFORM)
+ set(ANDROID_PLATFORM 21)
+endif()
+
+if(NOT ANDROID_ABI)
+ set(ANDROID_ABI arm64-v8a)
+endif()
+
+set(AS_EXECUTABLE as)
+
+# Toolchain file doesn't have access to cached variables:
+# https://gitlab.kitware.com/cmake/cmake/issues/16170. Set an intermediate
+# environment variable when loaded first time.
+if(AOM_ANDROID_NDK_PATH)
+ set(ENV{_AOM_ANDROID_NDK_PATH} "${AOM_ANDROID_NDK_PATH}")
+else()
+ set(AOM_ANDROID_NDK_PATH "$ENV{_AOM_ANDROID_NDK_PATH}")
+endif()
+
+if("${AOM_ANDROID_NDK_PATH}" STREQUAL "")
+ message(FATAL_ERROR "AOM_ANDROID_NDK_PATH not set.")
+ return()
+endif()
+
+include("${AOM_ANDROID_NDK_PATH}/build/cmake/android.toolchain.cmake")
+
+# No intrinsics flag required for arm64-android-clang.
+set(AOM_NEON_INTRIN_FLAG "")
+
+# No runtime cpu detect for arm64-android-clang.
+set(CONFIG_RUNTIME_CPU_DETECT 0 CACHE NUMBER "")
