How to build Android Kernel with Clang.

1. Download Clang:
   
   user@hostname$ cd ~/
   user@hostname$ wget https://github.com/Neutron-Toolchains/clang-build-catalogue/releases/download/10032024/neutron-clang-10032024.tar.zst -O clang.tar.zst
   
   
2. Extract clang.tar.zst
   
   user@hostname$ mkdir -p ~/clang
   user@hostname$ unzstd -d clang.tar.zst
   user@hostname$ tar -xf clang.tar -C ~/clang
   
   
3. Setting ENV value
   
   user@hostname$ export PATH="$HOME/clang/bin:$PATH"
   user@hostname$ export ARCH=arm64
   user@hostname$ export SUBARCH=ARM64
   user@hostname$ export KBUILD_BUILD_USER="username"
   user@hostname$ export KBUILD_BUILD_HOST="userhost"
   user@hostname$ export KBUILD_BUILD_TIMESTAMP="$(date)"
   
   
4. Clone Kernel Source code
   
   user@hostname$ git clone --depth=1 https://github.com/sunsky131221/kernel_sm8250 -b next-susfs kernel_sm8250
   user@hostname$ cd kernel_sm8250
   
   
5. Setting Kernel config
   
   user@hostname$ make O=out vendor/apollo_defconfig
   user@hostname$ make O=out menuconfig
   
   
6. Building
   user@hostname$ make O=out CC=clang -j$(nproc --all) CROSS_COMPILE=aarch64-linux-gnu- LLVM=1 LLVM_IAS=1
   
   
7. Compiled file will show in ./out/arch/arm64/boot folder.