From ab259422f0e4864421b79be79d66727d5e809bb6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=A9=BB=E9=AD=82=E5=9C=A3=E4=BD=BF?=
 <ling@noreply.lingapi.com>
Date: Sun, 23 Feb 2025 23:51:06 +0800
Subject: [PATCH] =?UTF-8?q?=E5=BC=95=E5=85=A5=E4=BA=A4=E5=8F=89=E7=BC=96?=
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---
 .cargo/config.toml |  3 +++
 README.md          | 51 +++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 .cargo/config.toml

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..b77d5f3
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,3 @@
+[target.aarch64-linux-android]
+linker = "aarch64-linux-android35-clang"
+ar = "llvm-ar"
\ No newline at end of file
diff --git a/README.md b/README.md
index 96fbc4b..28529b4 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,52 @@
 # 零点传输协议
 
-用于控制数据包如何交换，工作在TCP协议栈之上。
\ No newline at end of file
+用于控制数据包如何交换，工作在TCP协议栈之上。
+
+## 交叉编译
+
+由于LingTransmit依赖于openssl，所以你需要为目标操作系统交叉编译openssl。  
+以Android aarch64为例
+
+~~~ bash
+git clone https://github.com/openssl/openssl.git
+cd openssl
+export ANDROID_NDK_HOME=/home/ling/Android/Sdk/ndk/28.0.12916984/
+export TOOLCHAIN=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64
+export TARGET=aarch64-linux-android
+export ANDROID_NDK_ROOT=$ANDROID_NDK_HOME
+export PATH=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
+
+# 生成构建清单，指定安装目录为/home/ling/Android/openssl/aarch64，no-shared表示构建静态库
+./Configure android-arm64 -D__ANDROID_API__=34 --prefix=/home/ling/Android/openssl/aarch64 -DOPENSSL_STATIC=1 no-shared
+
+make -j15
+make install
+~~~
+
+然后需要设置一些环境变量，使得Cargo找到需要使用的库。
+
+~~~ bash 
+export OPENSSL_DIR=/home/ling/Android/openssl/aarch64
+export OPENSSL_LIB_DIR=$OPENSSL_DIR/lib
+export OPENSSL_INCLUDE_DIR=$OPENSSL_DIR/include
+
+# 允许 pkg-config 跨平台查找
+export PKG_CONFIG_ALLOW_CROSS=1
+export PKG_CONFIG_PATH=$OPENSSL_DIR/lib/pkgconfig
+export PKG_CONFIG_SYSROOT_DIR=$NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/sysroot
+~~~
+
+然后，在项目根目录创建 *.cargo/config.toml* 并添加：
+
+~~~ toml
+[target.aarch64-linux-android]
+linker = "aarch64-linux-android-clang"
+ar = "llvm-ar"
+~~~
+
+最后，即可清理缓存并重新构建
+
+~~~ bash
+cargo clean
+cargo build --release --target=aarch64-linux-android
+~~~
\ No newline at end of file