linux-kernel - [gustavoars:for-next/kspp-fam0-uapi 1/1] ./usr/include/linux/netfilter/x_tables.h:66:25: warning: field 'target' with variable sized type 'struct xt_entry_target' not at the end of a struct or class is a GNU extension

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Date:   Wed, 16 Feb 2022 08:50:24 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [gustavoars:for-next/kspp-fam0-uapi 1/1]
 ./usr/include/linux/netfilter/x_tables.h:66:25: warning: field 'target' with
 variable sized type 'struct xt_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 for-next/kspp-fam0-uapi
head:   d2d045d04ce9d694796e30ae6f8362d2788003a5
commit: d2d045d04ce9d694796e30ae6f8362d2788003a5 [1/1] treewide: uapi: Replace zero-length arrays with flexible-array members
config: i386-randconfig-a002-20220214 (https://download.01.org/0day-ci/archive/20220216/202202160827.ultVqzuo-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 37f422f4ac31c8b8041c6b62065263314282dab6)
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=d2d045d04ce9d694796e30ae6f8362d2788003a5
        git remote add gustavoars https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git
        git fetch --no-tags gustavoars for-next/kspp-fam0-uapi
        git checkout d2d045d04ce9d694796e30ae6f8362d2788003a5
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from <built-in>:1:
>> ./usr/include/linux/netfilter/x_tables.h:66:25: warning: field 'target' with variable sized type 'struct xt_entry_target' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct xt_entry_target target;
                                  ^
   ./usr/include/linux/netfilter/x_tables.h:71:25: warning: field 'target' with variable sized type 'struct xt_entry_target' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct xt_entry_target target;
                                  ^
   2 warnings generated.
--
   In file included from <built-in>:1:
   In file included from ./usr/include/linux/smc_diag.h:7:
>> ./usr/include/rdma/ib_user_verbs.h:436:34: warning: field 'base' with variable sized type 'struct ib_uverbs_create_cq_resp' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct ib_uverbs_create_cq_resp base;
                                           ^
>> ./usr/include/rdma/ib_user_verbs.h:644:34: warning: field 'base' with variable sized type 'struct ib_uverbs_create_qp_resp' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct ib_uverbs_create_qp_resp base;
                                           ^
>> ./usr/include/rdma/ib_user_verbs.h:740:29: warning: field 'base' with variable sized type 'struct ib_uverbs_modify_qp' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct ib_uverbs_modify_qp base;
                                      ^
>> ./usr/include/rdma/ib_user_verbs.h:916:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_eth::(anonymous at ./usr/include/rdma/ib_user_verbs.h:916:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
>> ./usr/include/rdma/ib_user_verbs.h:938:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_ipv4::(anonymous at ./usr/include/rdma/ib_user_verbs.h:938:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
>> ./usr/include/rdma/ib_user_verbs.h:956:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_tcp_udp::(anonymous at ./usr/include/rdma/ib_user_verbs.h:956:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
>> ./usr/include/rdma/ib_user_verbs.h:979:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_ipv6::(anonymous at ./usr/include/rdma/ib_user_verbs.h:979:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
>> ./usr/include/rdma/ib_user_verbs.h:992:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_action_tag::(anonymous at ./usr/include/rdma/ib_user_verbs.h:992:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
>> ./usr/include/rdma/ib_user_verbs.h:1016:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_action_handle::(anonymous at ./usr/include/rdma/ib_user_verbs.h:1016:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
>> ./usr/include/rdma/ib_user_verbs.h:1029:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_action_count::(anonymous at ./usr/include/rdma/ib_user_verbs.h:1029:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
>> ./usr/include/rdma/ib_user_verbs.h:1046:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_tunnel::(anonymous at ./usr/include/rdma/ib_user_verbs.h:1046:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
>> ./usr/include/rdma/ib_user_verbs.h:1064:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_esp::(anonymous at ./usr/include/rdma/ib_user_verbs.h:1064:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
>> ./usr/include/rdma/ib_user_verbs.h:1091:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_gre::(anonymous at ./usr/include/rdma/ib_user_verbs.h:1091:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
>> ./usr/include/rdma/ib_user_verbs.h:1114:2: warning: field '' with variable sized type 'union ib_uverbs_flow_spec_mpls::(anonymous at ./usr/include/rdma/ib_user_verbs.h:1114:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           union {
           ^
   14 warnings generated.
--
   In file included from <built-in>:1:
   In file included from ./usr/include/linux/netfilter_ipv6/ip6_tables.h:24:
>> ./usr/include/linux/netfilter/x_tables.h:66:25: warning: field 'target' with variable sized type 'struct xt_entry_target' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct xt_entry_target target;
                                  ^
   ./usr/include/linux/netfilter/x_tables.h:71:25: warning: field 'target' with variable sized type 'struct xt_entry_target' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct xt_entry_target target;
                                  ^
   In file included from <built-in>:1:
>> ./usr/include/linux/netfilter_ipv6/ip6_tables.h:131:20: warning: field 'entry' with variable sized type 'struct ip6t_entry' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct ip6t_entry entry;
                             ^
   ./usr/include/linux/netfilter_ipv6/ip6_tables.h:136:20: warning: field 'entry' with variable sized type 'struct ip6t_entry' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct ip6t_entry entry;
                             ^
   4 warnings generated.
--
   In file included from <built-in>:1:
>> ./usr/include/linux/seg6_hmac.h:12:17: warning: field 'tlvhdr' with variable sized type 'struct sr6_tlv' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
           struct sr6_tlv tlvhdr;
                          ^
   1 warning generated.

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org