[android] Build on mac M1

PluginSource/projects/Android/jni/Application.mk

@@ -1,5 +1,5 @@
 APP_ABI := armeabi-v7a arm64-v8a x86 x86_64
 APP_PLATFORM := android-9
-APP_STL := gnustl_static
+APP_STL := c++_static
 APP_CPPFLAGS += -std=c++11
 NDK_TOOLCHAIN_VERSION := clang

PluginSource/projects/Android/jni/make_apple_M1.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+set -e
+
+patch_ndk_on_apple_m1() {
+    os=$(uname -s)
+    arch=$(uname -m)
+
+    if [ $os == "Darwin" -a $arch == "arm64" ]; then
+        # Fix for building with NDK on Apple Silicon
+        # https://stackoverflow.com/questions/69541831/unknown-host-cpu-architecture-arm64-android-ndk-siliconm1-apple-macbook-pro
+        if [ ! -f $UNITY_NDK/ndk-build.old ]; then
+            cp $UNITY_NDK/ndk-build $UNITY_NDK/ndk-build.old
+        fi
+        echo '#!/bin/sh'                                         > $UNITY_NDK/ndk-build
+        echo 'DIR="$(cd "$(dirname "$0")" && pwd)"'             >> $UNITY_NDK/ndk-build
+        echo 'arch -x86_64 /bin/bash $DIR/build/ndk-build "$@"' >> $UNITY_NDK/ndk-build
+    fi
+}
+
+main() {
+
+    patch_ndk_on_apple_m1
+
+    # set UNITY_NDK environment variable to NDK installation used by Unity
+    # i. e. /Applications/Unity/Hub/Editor/2022.1.24f1/PlaybackEngines/AndroidPlayer/NDK
+    echo "Using UNITY_NDK: $UNITY_NDK"
+
+    # https://developer.android.com/ndk/guides/ndk-build
+    export NDK_PROJECT_PATH=$(cd ../ && pwd)
+    echo "Using NDK_PROJECT_PATH: $NDK_PROJECT_PATH"
+    $UNITY_NDK/ndk-build
+}
+
+main