linux-kernel - [gustavoars:testing/fsfa3 22/22] ./usr/include/linux/netfilter_bridge/ebtables.h:163:26: warning: field 'target' with variable sized type 'struct ebt_entry_target' not at the end of a struct or class is a GNU extension

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Date:   Wed, 5 Apr 2023 16:20:28 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [gustavoars:testing/fsfa3 22/22]
 ./usr/include/linux/netfilter_bridge/ebtables.h:163:26: warning: field
 'target' with variable sized type 'struct ebt_entry_target' not at the end
 of a struct or class is a GNU extension

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/fsfa3
head:   91ba9bf02e0d11bbe0b6fe49f40fb90818f2a06d
commit: 91ba9bf02e0d11bbe0b6fe49f40fb90818f2a06d [22/22] uapi: netfilter: ebtables: Replace zero-length array with flexible-array  member
config: x86_64-randconfig-a001-20230403 (https://download.01.org/0day-ci/archive/20230405/202304051623.Cvewnzo2-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=91ba9bf02e0d11bbe0b6fe49f40fb90818f2a06d
        git remote add gustavoars https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git
        git fetch --no-tags gustavoars testing/fsfa3
        git checkout 91ba9bf02e0d11bbe0b6fe49f40fb90818f2a06d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304051623.Cvewnzo2-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from <built-in>:1:
>> ./usr/include/linux/netfilter_bridge/ebtables.h:163:26: warning: field 'target' with variable sized type 'struct ebt_entry_target' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct ebt_entry_target target;
                                   ^
   1 warning generated.

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests