android arm64

engine/Build.bee.cs

         }
         skiaRoot = flutterRoot + "/third_party/skia";
 
+        buildArchitexture = Environment.GetEnvironmentVariable("BUILD_ARCHITECTURE");
+
          try
         {
             if(File.Exists("Scripts/bitcode.conf"))
 
     private static string skiaRoot;
     private static string flutterRoot;
+    private static string buildArchitexture;
 
     //this setting is disabled by default, don't change it unless you know what you are doing
     //it must be set the same as the settings we choose to build the flutter txt library
             "-I"+ flutterRoot+"/flutter/third_party/txt/src",
             "-I" + flutterRoot + "/third_party/harfbuzz/src",
             "-I" + skiaRoot + "/third_party/externals/icu/source/common",
+            //"-I/Users/siyao/Documents/GitHub/com.unity.uiwidgets/engine/artifacts/Stevedore/android-ndk-mac/sources/cxx-stl/llvm-libc++/include/memory",
 
             // "-Igen",
             "-I"+ flutterRoot+"/third_party/libcxx/include",
             "-Wno-deprecated-declarations",
 
             "-fno-strict-aliasing",
-            "-march=armv7-a",
+            // "-march=armv7-a",
-            "-mtune=generic-armv7-a",
+            //"-mtune=generic-armv7-a",
             "-mthumb",
             "-fPIC",
             "-pipe",
             "-fno-short-enums",
             "-nostdinc++",
-            "--target=arm-linux-androideabi",
+            // "--target=arm-linux-androideabi",
+            "--target=aarch64-linux-android",
             "-mfpu=neon",
             "-Wall",
             "-Wextra",
             // "-Wno-non-c-typedef-for-linkage",
             "-isystem"+ flutterRoot+"/third_party/android_tools/ndk/sources/android/support/include",
             "-isystem"+ flutterRoot +
-            "/third_party/android_tools/ndk/sysroot/usr/include/arm-linux-androideabi",
+            //"/third_party/android_tools/ndk/sysroot/usr/include/arm-linux-androideabi",
+            "/third_party/android_tools/ndk/sysroot/usr/include/aarch64-linux-android",
             //"-D__ANDROID_API__=16",
             // "-fvisibility=hidden",
             "--sysroot="+ flutterRoot+"/third_party/android_tools/ndk/sysroot",
         np.LinkerSettings().Add(c => {
             return IsWindows(c) && c.CodeGen == CodeGen.Debug;
         }, l => l.WithCustomFlags_workaround(new[] { "/DEBUG:FULL" }));
+        Console.WriteLine("???????" + "-L" + flutterRoot + "/third_party/android_tools/ndk/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64");
 
         np.LinkerSettings().Add(c => IsAndroid(c), l => l.WithCustomFlags_workaround(new[] {
             "-Wl,--fatal-warnings",
             "-Wl,-z,relro",
             "-Wl,-z,defs",
             "--gcc-toolchain="+ flutterRoot +
-            "/third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64",
+            //"/third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64",
+            "/third_party/android_tools/ndk/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64",
-            "--target=arm-linux-androideabi",
+            //"--target=arm-linux-androideabi",
-            "--sysroot="+ flutterRoot+"/third_party/android_tools/ndk/platforms/android-16/arch-arm",
-            "-L"+ flutterRoot + "/third_party/android_tools/ndk/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a",
+            //"--sysroot="+ flutterRoot+"/third_party/android_tools/ndk/platforms/android-16/arch-arm",
+            "--sysroot="+ flutterRoot+"/third_party/android_tools/ndk/platforms/android-22/arch-arm64",
+            //"-L"+ flutterRoot + "/third_party/android_tools/ndk/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a",
+            "-L"+ flutterRoot + "/third_party/android_tools/ndk/sources/cxx-stl/llvm-libc++/libs/arm64-v8a",
+            "-L/Users/siyao/Documents/GitHub/com.unity.uiwidgets/engine/Scripts/engine/src/third_party/android_tools/ndk/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/lib/gcc/aarch64-linux-android/4.9.x",
             "-Wl,--build-id=sha1",
             "-g",
             "-Wl,-soname=libUIWidgets.so",
         }
         else if (platform == UIWidgetsBuildTargetPlatform.android)
         {
-            var androidToolchain = ToolChain.Store.Android().r19().Armv7();
+            //var androidToolchain = ToolChain.Store.Android().r19().Armv7();
+            var androidToolchain = ToolChain.Store.Android().r19().Arm64();
 
             var validConfigurations = new List<NativeProgramConfiguration>();
 
         {
             if(c.CodeGen == CodeGen.Debug){
                 return new PrecompiledLibrary[]{
-                    new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/flutter/third_party/txt/libtxt_lib.a"),
+                    new StaticLibrary(flutterRoot+"/out/android_debug_unopt_arm64/obj/flutter/third_party/txt/libtxt_lib.a"),
                 };
             } else {
                 return new PrecompiledLibrary[]{
                 // icudtl
                 new StaticLibrary("icudtl.o"),
 
-                new StaticLibrary(flutterRoot+"/third_party/android_tools/ndk/platforms/android-16/arch-arm/usr/lib/crtbegin_so.o"),
-                new StaticLibrary(flutterRoot+"/third_party/android_tools/ndk/platforms/android-16/arch-arm/usr/lib/crtend_so.o"),
+                //new StaticLibrary(flutterRoot+"/third_party/android_tools/ndk/platforms/android-16/arch-arm/usr/lib/crtbegin_so.o"),
+                new StaticLibrary(flutterRoot+"/third_party/android_tools/ndk/platforms/android-22/arch-arm64/usr/lib/crtbegin_so.o"),
+                
+                //new StaticLibrary(flutterRoot+"/third_party/android_tools/ndk/platforms/android-16/arch-arm/usr/lib/crtend_so.o"),
+                new StaticLibrary(flutterRoot+"/third_party/android_tools/ndk/platforms/android-22/arch-arm64/usr/lib/crtbegin_so.o"),
-                new SystemLibrary("android_support"),
-                new SystemLibrary("unwind"),
+
+                // new SystemLibrary("android_support"),
+                // new SystemLibrary("unwind"),
                 new SystemLibrary("gcc"),
                 new SystemLibrary("c"),
                 new SystemLibrary("dl"),

engine/Scripts/lib_build.py

 bitcode=""
 flutter_root_path=""
 visual_studio_path=""
+architecture=""
 
 def get_opts():
     # get intput agrs
     global bitcode
     global visual_studio_path
     global platform
+    global architecture
-    options, args = getopt.getopt(sys.argv[1:], 'r:p:m:v:eh',["help"])
+    options, args = getopt.getopt(sys.argv[1:], 'r:p:m:v:eh',["arm64","help"])
     for opt, arg in options:
         if opt == '-r':
             engine_path = arg # set engine_path, depot_tools and flutter engine folder will be put into this path
             visual_studio_path = arg
         elif opt == '-e':
             bitcode="-bitcode_bundle -bitcode_verify"
+        elif opt == '--arm64':
+            architecture = "arm64"
+            if platform == "android":
+                gn_params += " --android-cpu=arm64"
         elif opt in ("-h","--help"):
             show_help()
             sys.exit()
         output_path="android_release"
     elif runtime_mode == "debug" and platform == "android":
         optimize="--unoptimized"
-        output_path="android_debug_unopt"
+        if architecture == "arm64":
+            output_path="android_debug_unopt_arm64"
+        else:
+            output_path="android_debug_unopt"
     elif runtime_mode == "release" and platform == "ios":
         optimize=""
         output_path="ios_release"
     elif platform == "android":
         dest_folder = "android"
         os.chdir(work_path + "/../")
-        os.system("python " + flutter_root_path + "/flutter/sky/tools/objcopy.py --objcopy " + flutter_root_path + "/third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-objcopy --input " + flutter_root_path + "/third_party/icu/flutter/icudtl.dat --output icudtl.o --arch arm")
+        if architecture == "arm64":
+            os.system("python " + flutter_root_path + "/flutter/sky/tools/objcopy.py --objcopy " + flutter_root_path + "/third_party/android_tools/ndk/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-objcopy  --input " + flutter_root_path + "/third_party/icu/flutter/icudtl.dat --output icudtl.o --arch aarch64")
+        else:
+            os.system("python " + flutter_root_path + "/flutter/sky/tools/objcopy.py --objcopy " + flutter_root_path + "/third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-objcopy --input " + flutter_root_path + "/third_party/icu/flutter/icudtl.dat --output icudtl.o --arch arm")
     elif platform == "ios":
         dest_folder = "ios"
     if not os.path.exists(Path(work_path + "/../../com.unity.uiwidgets/Runtime/Plugins/" + dest_folder)):
                 os.chdir(Path(work_path + "/../"))
                 os.system("artifacts/Stevedore/android-ndk-mac/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++ " + "@\"" + rsp + "\"")
                 os.system(flutter_root_path + "/buildtools/mac-x64/clang/bin/clang++ " + "@\"" + rsp + "\"")
-                copy_file(Path(work_path + "/../artifacts/libUIWidgets/release_Android_arm32/libUIWidgets.so"), Path(work_path + "/../../com.unity.uiwidgets/Runtime/Plugins/Android"))
+                if architecture == "arm64":
+                    copy_file(Path(work_path + "/../artifacts/libUIWidgets/release_Android_arm64/libUIWidgets.so"), Path(work_path + "/../../com.unity.uiwidgets/Runtime/Plugins/Android"))
+                else:
+                    copy_file(Path(work_path + "/../artifacts/libUIWidgets/release_Android_arm32/libUIWidgets.so"), Path(work_path + "/../../com.unity.uiwidgets/Runtime/Plugins/Android"))
             elif platform == "ios":
                 print("\nStarting prlink library...")
                 os.chdir(Path(work_path + "/../"))

engine/Scripts/lib_build_android.sh

 engine_path=$(pwd)
 runtime_mode=release
-
-while getopts ":r:m:" opt
+architecture=false
+while getopts ":r:m:a:" opt
 do
     case $opt in
         r)
         runtime_mode=$OPTARG
+        ;;
+        a)
+        architecture=true
         ;;
         ?)
         echo "unknown param"
 
-python3 lib_build.py -r $engine_path -p android -m $runtime_mode
+if [ $architecture ]; then
+    python3 lib_build.py -r $engine_path -p android -m $runtime_mode --arm64
+else
+    python3 lib_build.py -r $engine_path -p android -m $runtime_mode
+fi