用clang编译Linux内核

安装clang

• https://apt.llvm.org/

For convenience there is an automatic installation script available that installs LLVM for you.
To install the latest stable version:
 
bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)"
 
 
To install a specific version of LLVM:
 
wget https://apt.llvm.org/llvm.sh
chmod +x llvm.sh
sudo ./llvm.sh <version number>
 
To install all apt.llvm.org packages at once:
 
wget https://apt.llvm.org/llvm.sh
chmod +x llvm.sh
sudo ./llvm.sh <version number> all
# or
sudo ./llvm.sh all

比如安装14：

sudo ./llvm.sh 14 all

安装完毕后，可以使用update-alternatives配置一下：

sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-10 50 --slave /usr/bin/clang++ clang++ /usr/bin/clang++-10 --slave /usr/bin/clang-cpp clang-cpp /usr/bin/clang-cpp-10
 
sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-14 100 --slave /usr/bin/clang++ clang++ /usr/bin/clang++-14 --slave /usr/bin/clang-cpp clang-cpp /usr/bin/clang-cpp-14
 
sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-17 200 --slave /usr/bin/clang++ clang++ /usr/bin/clang++-17 --slave /usr/bin/clang-cpp clang-cpp /usr/bin/clang-cpp-17

编译内核

• Building Linux with Clang/LLVM

比如按照前面的步骤按照了clang，版本是17，那么可以使用下面的命令编译：

make LLVM=-17