Hi Masahiro, I love your patch! Yet something to improve: [auto build test ERROR on kbuild/for-next] [also build test ERROR on net-next/master net/master linus/master v5.6-rc7 next-20200325] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Masahiro-Yamada/net-wan-wanxl-use-CC68K-instead-of-AS68K-for-rebuilding-firmware/20200326-034145 base: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git for-next config: powerpc-defconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 2093fdd429d52348e08969180ac6b1e705fc4ff6) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree COMPILER=clang make.cross ARCH=powerpc If you fix the issue, kindly add following tag Reported-by: kbuild test robot All errors (new ones prefixed by >>): >> /bin/sh: 0: Illegal option -- 6 real 3 user 2 sys 107.14% cpu make distclean -- >> /bin/sh: 0: Illegal option -- 4 real 4 user 1 sys 114.93% cpu make olddefconfig -- >> /bin/sh: 0: Illegal option -- /usr/bin/ld: scripts/dtc/dtc-parser.tab.o:(.bss+0x10): multiple definition of `yylloc'; scripts/dtc/dtc-lexer.lex.o:(.bss+0x58): first defined here clang-11: error: linker command failed with exit code 1 (use -v to see invocation) make[2]: *** [scripts/Makefile.host:116: scripts/dtc/dtc] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1270: scripts_dtc] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:180: sub-make] Error 2 17 real 6 user 11 sys 102.46% cpu make prepare --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org