Various fixes/improvements to Android building scripts

Use [cargo-ndk](https://github.com/bbqsrc/cargo-ndk) to configure cargo for building with the Android NDK. The output of `cargo ndk` is written to a subfolder for the target triplet, which cannot be changed by parameter. Therefore, the `CARGO_BUILD_DIR` is changed to this subfolder for the Android build, so the build process can find the output.

Use `$HOME` instead of `~` because cargo-ndk cannot correctly access the folder otherwise (will fail with error message indicating it could not determine the NDK version).

Add `DDNET_TEST_NO_LINK=ON` CMake argument, to fix Rust linking errors with tests.

Add additional CMake arguments to specify system name, API version and NDK location. Upgrade to Android API 34.

Use `nproc` instead of `32` threads for building.

CMakeLists.txt

@@ -866,9 +866,15 @@ set_glob(RUST_MASTERSRV GLOB "rs;toml" src/mastersrv/src
 add_library(rust-bridge-shared EXCLUDE_FROM_ALL OBJECT ${RUST_BRIDGE_SHARED})
 list(APPEND TARGETS_OWN rust-bridge-shared)
 
-set(CARGO_BUILD_DIR "")
-set(CARGO_BUILD ${CMAKE_COMMAND} -E env CARGO_TARGET_DIR=${PROJECT_BINARY_DIR} DDNET_TEST_NO_LINK=1 ${RUST_CARGO} build)
-set(CARGO_TEST ${CMAKE_COMMAND} -E env CARGO_TARGET_DIR=${PROJECT_BINARY_DIR} ${RUST_CARGO} test)
+if(TARGET_OS STREQUAL "android")
+  set(CARGO_BUILD_DIR "${CARGO_NDK_TARGET}/")
+  set(CARGO_BUILD ${CMAKE_COMMAND} -E env CARGO_TARGET_DIR=${PROJECT_BINARY_DIR} DDNET_TEST_NO_LINK=1 ${RUST_CARGO} ndk -t ${CARGO_NDK_TARGET} -p ${CARGO_NDK_API} build)
+  set(CARGO_TEST ${CMAKE_COMMAND} -E env CARGO_TARGET_DIR=${PROJECT_BINARY_DIR} ${RUST_CARGO} ndk -t ${CARGO_NDK_TARGET} -p ${CARGO_NDK_API} test)
+else()
+  set(CARGO_BUILD_DIR "")
+  set(CARGO_BUILD ${CMAKE_COMMAND} -E env CARGO_TARGET_DIR=${PROJECT_BINARY_DIR} DDNET_TEST_NO_LINK=1 ${RUST_CARGO} build)
+  set(CARGO_TEST ${CMAKE_COMMAND} -E env CARGO_TARGET_DIR=${PROJECT_BINARY_DIR} ${RUST_CARGO} test)
+endif()
 if(MSVC)
   list(INSERT CARGO_BUILD 0 ${CMAKE_COMMAND} -E env $<$<CONFIG:Debug>:CFLAGS=/MTd> $<$<CONFIG:Debug>:CXXFLAGS=/MTd>)
   list(INSERT CARGO_TEST 0 ${CMAKE_COMMAND} -E env RUSTFLAGS=-Ctarget-feature=+crt-static)

scripts/android/cmake_android.sh

@@ -1,18 +1,22 @@
 #!/bin/bash
 
-export ANDROID_HOME=~/Android/Sdk
-export MAKEFLAGS=-j32
+# $HOME must be used instead of ~ else cargo-ndk cannot find the folder
+export ANDROID_HOME=$HOME/Android/Sdk
+MAKEFLAGS=-j$(nproc)
+export MAKEFLAGS
 
 ANDROID_NDK_VERSION="$(cd "$ANDROID_HOME/ndk" && find . -maxdepth 1 | sort -n | tail -1)"
 ANDROID_NDK_VERSION="${ANDROID_NDK_VERSION:2}"
+# ANDROID_NDK_VERSION must be exported for build.sh step
 export ANDROID_NDK_VERSION
-ANDROID_NDK="$ANDROID_HOME/ndk/$ANDROID_NDK_VERSION"
+# ANDROID_NDK_HOME must be exported for cargo-ndk
+export ANDROID_NDK_HOME="$ANDROID_HOME/ndk/$ANDROID_NDK_VERSION"
 
 _DEFAULT_ANDROID_BUILD=x86
 _DEFAULT_GAME_NAME=DDNet
 _DEFAULT_BUILD_TYPE=Debug
 _DEFAULT_BUILD_FOLDER=build-android
-_ANDROID_API_LEVEL=android-24
+_ANDROID_API_LEVEL=34
 
 _ANDROID_SUB_BUILD_DIR=build_arch
 
@@ -102,12 +106,19 @@ function build_for_type() {
 		-G "Ninja" \
 		-DPREFER_BUNDLED_LIBS=ON \
 		-DCMAKE_BUILD_TYPE="${_DEFAULT_BUILD_TYPE}" \
-		-DANDROID_NATIVE_API_LEVEL="$_ANDROID_API_LEVEL" \
-		-DCMAKE_TOOLCHAIN_FILE="$ANDROID_NDK/build/cmake/android.toolchain.cmake" \
-		-DANDROID_NDK="$ANDROID_NDK" \
+		-DANDROID_PLATFORM="android-${_ANDROID_API_LEVEL}" \
+		-DCMAKE_TOOLCHAIN_FILE="$ANDROID_NDK_HOME/build/cmake/android.toolchain.cmake" \
+		-DANDROID_NDK="$ANDROID_NDK_HOME" \
 		-DANDROID_ABI="${2}" \
 		-DANDROID_ARM_NEON=TRUE \
-		-B${_DEFAULT_BUILD_FOLDER}/"$_ANDROID_SUB_BUILD_DIR/$1" \
+		-DCMAKE_ANDROID_NDK="$ANDROID_NDK_HOME" \
+		-DCMAKE_SYSTEM_NAME=Android \
+		-DCMAKE_SYSTEM_VERSION="$_ANDROID_API_LEVEL" \
+		-DCMAKE_ANDROID_ARCH_ABI="${2}" \
+		-DCARGO_NDK_TARGET="${3}" \
+		-DCARGO_NDK_API="$_ANDROID_API_LEVEL" \
+		-DDDNET_TEST_NO_LINK=ON \
+		-B"${_DEFAULT_BUILD_FOLDER}/$_ANDROID_SUB_BUILD_DIR/$1" \
 		-DSERVER=OFF \
 		-DTOOLS=OFF \
 		-DDEV=TRUE \
@@ -120,29 +131,29 @@ function build_for_type() {
 	)
 }
 
-mkdir ${_DEFAULT_BUILD_FOLDER}
+mkdir "${_DEFAULT_BUILD_FOLDER}"
 
 if [[ "${_DEFAULT_ANDROID_BUILD}" == "arm" || "${_DEFAULT_ANDROID_BUILD}" == "all" ]]; then
-	build_for_type arm armeabi-v7a &
+	build_for_type arm armeabi-v7a armv7-linux-androideabi &
 fi
 
 if [[ "${_DEFAULT_ANDROID_BUILD}" == "arm64" || "${_DEFAULT_ANDROID_BUILD}" == "all" ]]; then
-	build_for_type arm64 arm64-v8a &
+	build_for_type arm64 arm64-v8a aarch64-linux-android &
 fi
 
 if [[ "${_DEFAULT_ANDROID_BUILD}" == "x86" || "${_DEFAULT_ANDROID_BUILD}" == "all" ]]; then
-	build_for_type x86 x86 &
+	build_for_type x86 x86 i686-linux-android &
 fi
 
 if [[ "${_DEFAULT_ANDROID_BUILD}" == "x86_64" || "${_DEFAULT_ANDROID_BUILD}" == "x64" || "${_DEFAULT_ANDROID_BUILD}" == "all" ]]; then
-	build_for_type x86_64 x86_64 &
+	build_for_type x86_64 x86_64 x86_64-linux-android &
 fi
 
 wait
 
 printf "\e[36mPreparing gradle build\n"
 
-cd ${_DEFAULT_BUILD_FOLDER} || exit 1
+cd "${_DEFAULT_BUILD_FOLDER}" || exit 1
 
 mkdir -p src/main
 mkdir -p src/main/res/mipmap

scripts/compile_libs/cmake_lib_compile.sh

@@ -1,10 +1,11 @@
 #!/bin/bash
 
 ANDROID_HOME=~/Android/Sdk
-ANDROID_NDK="$(find "$ANDROID_HOME/ndk" -maxdepth 1 | sort -n | tail -1)"
-echo "$ANDROID_NDK"
+ANDROID_NDK_HOME="$(find "$ANDROID_HOME/ndk" -maxdepth 1 | sort -n | tail -1)"
+export ANDROID_NDK_HOME
 
-export MAKEFLAGS=-j32
+MAKEFLAGS=-j$(nproc)
+export MAKEFLAGS
 
 if [[ "${2}" == "webasm" ]]; then
 	COMPILEFLAGS="-pthread -O3 -g -s USE_PTHREADS=1"
@@ -20,10 +21,15 @@ function compile_source() {
 			-H. \
 			-G "Unix Makefiles" \
 			-DCMAKE_BUILD_TYPE=Release \
-			-DANDROID_NATIVE_API_LEVEL="android-$1" \
-			-DCMAKE_TOOLCHAIN_FILE="$ANDROID_NDK/build/cmake/android.toolchain.cmake" \
+			-DANDROID_PLATFORM="android-$1" \
+			-DCMAKE_TOOLCHAIN_FILE="$ANDROID_NDK_HOME/build/cmake/android.toolchain.cmake" \
+			-DANDROID_NDK="$ANDROID_NDK_HOME" \
 			-DANDROID_ABI="${3}" \
 			-DANDROID_ARM_NEON=TRUE \
+			-DCMAKE_ANDROID_NDK="$ANDROID_NDK_HOME" \
+			-DCMAKE_SYSTEM_NAME=Android \
+			-DCMAKE_SYSTEM_VERSION="$1" \
+			-DCMAKE_ANDROID_ARCH_ABI="${3}" \
 			-B"$2" \
 			-DBUILD_SHARED_LIBS=OFF \
 			-DHIDAPI_SKIP_LIBUSB=TRUE \

scripts/compile_libs/gen_libs.sh

@@ -53,6 +53,8 @@ fi
 mkdir -p "$1"
 cd "$1" || exit 1
 
+_ANDROID_ABI_LEVEL=34
+
 function build_cmake_lib() {
 	if [ ! -d "${1}" ]; then
 		if [ -z ${3+x} ]; then
@@ -68,8 +70,6 @@ function build_cmake_lib() {
 	)
 }
 
-_ANDROID_ABI_LEVEL=24
-
 mkdir -p compile_libs
 cd compile_libs || exit 1