Enable Linux Kernel Clang LTO

recompile

@@ -238,35 +238,48 @@ compile_env_check() {
  [ -n "${local_kernel}" ] && error_msg "The current system has the same named kernel [ ${kernel_outname} ], stop compiling!"
  echo -e "${INFO} Compile kernel output name [ ${kernel_outname} ]. \n"
 
+ # Get current kernel version
+ kernel_v=$(echo "${kernel_version}" | cut -d '.' -f1)
+ kernel_p=$(echo "${kernel_version}" | cut -d '.' -f2)
+ kernel_s=$(echo "${kernel_version}" | cut -d '.' -f3)
+
  # Create a temp directory
  rm -rf ${out_kernel}/{chroot/,boot/,dtb/,modules/,header/,${kernel_version}/} 2>/dev/null && sync
  mkdir -p ${out_kernel}/{chroot/{root/boot/,},boot/,dtb/{allwinner/,amlogic/,rockchip/},modules/,header/,${kernel_version}/} && sync
 }
 
 make_kernel() {
  cd ${kernel_path}/${local_kernel_dirname}
- # Set cross compilation parameters
  echo -e "${STEPS} Set cross compilation parameters."
+ # Set cross compilation parameters
  export ARCH="arm64"
  export LOCALVERSION="${custom_name}"
- export PATH=${PATH}:${toolchain_dir}/${gcc_file//.tar.xz/}/bin
+ export PATH=${toolchain_dir}/${clang_file//.tar.xz/}/bin:${PATH}
  export CROSS_COMPILE=${toolchain_dir}/${gcc_file//.tar.xz/}/bin/aarch64-none-linux-gnu-
  export CLANG_TRIPLE=${toolchain_dir}/${clang_file//.tar.xz/}/bin
  export CC=${toolchain_dir}/${clang_file//.tar.xz/}/bin/clang
  export LD=${toolchain_dir}/${clang_file//.tar.xz/}/bin/ld.lld
- #
- sed -i '/^PATH=/d' /etc/profile 2>/dev/null && sync
- echo "PATH=${PATH}:${toolchain_dir}/${gcc_file//.tar.xz/}/bin" >>/etc/profile && sync
- source /etc/profile
- #
+ # Set $PATH variable for ~/.bashrc
  sed -i '/^PATH=/d' ~/.bashrc 2>/dev/null && sync
- echo "PATH=${PATH}:${toolchain_dir}/${gcc_file//.tar.xz/}/bin" >>~/.bashrc && sync
+ echo "PATH=${PATH}" >>~/.bashrc && sync
  source ~/.bashrc
- #
+ # Set $PATH variable for /etc/profile
+ sed -i '/^PATH=/d' /etc/profile 2>/dev/null && sync
+ echo "PATH=${PATH}" >>/etc/profile && sync
+ source /etc/profile
+
+ # Enable/Disabled Linux Kernel Clang LTO
+ if [[ "${kernel_v}" -ge "6" ]] || [[ "${kernel_v}" -eq "5" && "${kernel_p}" -ge "12" ]]; then
+ scripts/config -e LTO_CLANG_THIN
+ else
+ scripts/config -d LTO_CLANG_THIN
+ fi
+
+ # Set generic make string
  MAKE_SET_STRING=" ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} CLANG_TRIPLE=${CLANG_TRIPLE} CC=${CC} LD=${LD} LLVM=1 LLVM_IAS=1 LOCALVERSION=${LOCALVERSION} "
 
  # Make clean/mrproper
- make ${MAKE_SET_STRING} clean
+ #make ${MAKE_SET_STRING} clean
 
  # Make menuconfig
  #make ${MAKE_SET_STRING} menuconfig
@@ -285,7 +298,6 @@ make_kernel() {
  fi
  #
  sed -i "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"\"|" .config
- #sed -i "s|# CONFIG_LOCALVERSION_AUTO.*|CONFIG_LOCALVERSION_AUTO=n|" .config
  sync
 
  # Make kernel