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vim /etc/apt/sources.list

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apt update

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apt install -y clang cmake libgmp-dev libmpfr-dev libmpc-dev make

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git clone https://github.com/llvm/llvm-project.git
cd llvm-project

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mkdir llvm-build
cd llvm-build
cmake -G "Unix Makefiles"  -DCMAKE_BUILD_TYPE="Release" ../llvm
make -j 4
make install

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mkdir clang-build
cd clang-build
cmake -G "Unix Makefiles" -DLLVM_INCLUDE_TESTS=OFF -DCMAKE_BUILD_TYPE="Release" ../clang
make -j 4
make install

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cat << EOF > /etc/apt/sources.list
# 默认注释了源码仓库，如有需要可自行取消注释
deb http://mirrors.ustc.edu.cn/debian bookworm main contrib non-free non-free-firmware
deb-src http://mirrors.ustc.edu.cn/debian bookworm main contrib non-free non-free-firmware
deb http://mirrors.ustc.edu.cn/debian bookworm-updates main contrib non-free non-free-firmware
deb-src http://mirrors.ustc.edu.cn/debian bookworm-updates main contrib non-free non-free-firmware

# backports 软件源，请按需启用
deb http://mirrors.ustc.edu.cn/debian bookworm-backports main contrib non-free non-free-firmware
deb-src http://mirrors.ustc.edu.cn/debian bookworm-backports main contrib non-free non-free-firmware
EOF

apt update
# 需要一个老版本的C++编译器, g++或者clang++都可以
apt install -y clang cmake libgmp-dev libmpfr-dev libmpc-dev make
# 下载源码
git clone https://github.com/llvm/llvm-project.git
cd llvm-project
base_dir=$(pwd)
# clang依赖llvm, 需要先构建llvm
mkdir ${base_dir}/llvm-build

cd ${base_dir}/llvm-build
cmake -G "Unix Makefiles"  -DCMAKE_BUILD_TYPE="Release" ${base_dir}/llvm
# 等待一小时
make -j 4
make install

# 构建clang
mkdir ${base_dir}/clang-build
cd ${base_dir}/clang-build
# 必须要在前面先安装llvm
cmake -G "Unix Makefiles" -DLLVM_INCLUDE_TESTS=OFF -DCMAKE_BUILD_TYPE="Release" ${base_dir}/clang
# 等待两小时
make -j 4
make install