Re: [PATCH 2/2] kbuild: move -Wundef from KBUILD_CFLAGS to KBUILD_CPPFLAGS

From: Masahiro Yamada <masahiroy@kernel.org>
To: kernel test robot <lkp@intel.com>
Cc: Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	clang-built-linux <llvm@lists.linux.dev>,
	kbuild-all@lists.01.org, Michal Marek <michal.lkml@markovi.net>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2] kbuild: move -Wundef from KBUILD_CFLAGS to KBUILD_CPPFLAGS
Date: Tue, 6 Sep 2022 01:01:40 +0900	[thread overview]
Message-ID: <CAK7LNASF62o3iRq+tFr=j88dsWxo6YjJ3_mYiAP4pX3DcQpP9A@mail.gmail.com> (raw)
In-Reply-To: <202209052329.sY4Fx2fi-lkp@intel.com>

On Tue, Sep 6, 2022 at 12:49 AM kernel test robot <lkp@intel.com> wrote:
>
> Hi Masahiro,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on masahiroy-kbuild/for-next]
> [also build test WARNING on linus/master v6.0-rc4]
> [cannot apply to next-20220901]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Masahiro-Yamada/kbuild-move-Werror-from-KBUILD_CFLAGS-to-KBUILD_CPPFLAGS/20220905-164209
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git for-next
> config: riscv-randconfig-r042-20220905 (https://download.01.org/0day-ci/archive/20220905/202209052329.sY4Fx2fi-lkp@intel.com/config)
> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project c55b41d5199d2394dd6cdb8f52180d8b81d809d4)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install riscv cross compiling tool for clang build
>         # apt-get install binutils-riscv64-linux-gnu
>         # https://github.com/intel-lab-lkp/linux/commit/2f8ee1865d7d00ad27460d94056c7752cad8481f
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Masahiro-Yamada/kbuild-move-Werror-from-KBUILD_CFLAGS-to-KBUILD_CPPFLAGS/20220905-164209
>         git checkout 2f8ee1865d7d00ad27460d94056c7752cad8481f
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@intel.com>
>
> All warnings (new ones prefixed by >>):
>
> >> arch/riscv/kernel/head.S:329:5: warning: 'CONFIG_RISCV_BOOT_SPINWAIT' is not defined, evaluates to 0 [-Wundef]
>    #if CONFIG_RISCV_BOOT_SPINWAIT
>        ^
>    1 warning generated.
>

Hmm, it looks like my patch started to uncover a couple of coding mistakes.

　#if CONFIG_RISCV_BOOT_SPINWAIT
          -->

  #ifdef CONFIG_RISCV_BOOT_SPINWAIT

(CONFIG_RISCV_BOOT_SPINWAIT is a bool option)

-- 
Best Regards
Masahiro Yamada