1. 安装编译工具

sudo apt-get install -y autoconf automake libtool pkg-config

2. 设置环境变量

# 交叉编译工具链的根目录
export TLCS_ROOT=...-x86_64_aarch64-linux-gnu

3. 编译libpcap

3.1 安装依赖

sudo apt-get install -y flex bison

3.2 交叉编译

# 克隆源码
git clone --recursive -b libpcap-1.9.1 https://github.com/the-tcpdump-group/libpcap.git

# 进入仓库
cd libpcap

# 生成构建环境
autoreconf -fiv

# 创建构建目录
rm -rf build_aarch64; mkdir build_aarch64 && cd build_aarch64

# 生成Makefile。其中，CFLAGS="-O2" 用于去除生成文件中的调试信息
env -v                                           \
AR=${TLCS_ROOT}/bin/aarch64-linux-gnu-ar         \
CC=${TLCS_ROOT}/bin/aarch64-linux-gnu-gcc        \
RANLIB=${TLCS_ROOT}/bin/aarch64-linux-gnu-ranlib \
CFLAGS="-O2"                                     \
../configure                                     \
--with-pcap=linux                                \
--host=aarch64-linux-gnu                         \
--prefix=${HOME}/libs/libpcap-1.9.1

# 构建与安装
make -j16 && make install

4. 编译TCPDUMP

4.1 克隆仓库与生成构建环境

# 克隆源码
git clone --recursive -b tcpdump-4.9.3 https://github.com/the-tcpdump-group/tcpdump.git

# 进入仓库
cd tcpdump

# 生成构建环境
autoreconf -fiv

# 创建构建目录
rm -rf build_aarch64; mkdir build_aarch64 && cd build_aarch64

4.2 静态链接LIBPCAP

env -v                                           \
CC=${TLCS_ROOT}/bin/aarch64-linux-gnu-gcc        \
AR=${TLCS_ROOT}/bin/aarch64-linux-gnu-ar         \
RANLIB=${TLCS_ROOT}/bin/aarch64-linux-gnu-ranlib \
CPPFLAGS="-I${HOME}/libs/libpcap-1.9.1/include"  \
LDFLAGS="-L${HOME}/libs/libpcap-1.9.1/lib"       \
LIBS="-static -lpcap"                            \
CFLAGS="-O2"                                     \
../configure                                     \
--host=aarch64-linux-gnu                         \
--prefix=${HOME}/libs/libtcpdump-4.9.3

4.3 动态链接LIBPCAP

env -v                                           \
CC=${TLCS_ROOT}/bin/aarch64-linux-gnu-gcc        \
AR=${TLCS_ROOT}/bin/aarch64-linux-gnu-ar         \
RANLIB=${TLCS_ROOT}/bin/aarch64-linux-gnu-ranlib \
CPPFLAGS="-I${HOME}/libs/libpcap-1.9.1/include"  \
LDFLAGS="-L${HOME}/libs/libpcap-1.9.1/lib"       \
LIBS="-dynamic -lpcap"                           \
CFLAGS="-O2"                                     \
../configure                                     \
--host=aarch64-linux-gnu                         \
--prefix=${HOME}/libs/libtcpdump-4.9.3

4.4 构建与安装

make -j16 && make install

5. 查看交叉编译结果

5.1 文件布局

cd ${HOME}/libs
tree . -L 3