Hi Alexei,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   cb323ee75d24e7acc2f188d123ba6df46159cf09
commit: d71fa5c9763c24dd997a2fa4feb7a13a95bab42c bpf: Add kernel module with user mode driver that populates bpffs.
date:   1 year, 5 months ago
config: i386-randconfig-m021 (https://download.01.org/0day-ci/archive/20220130/202201300518.Q1ZGEJYY-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d71fa5c9763c24dd997a2fa4feb7a13a95bab42c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout d71fa5c9763c24dd997a2fa4feb7a13a95bab42c
        # save the config file to linux build tree
        mkdir build_dir
        make 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@intel.com>

All errors (new ones prefixed by >>):

   /usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libelf.so when searching for -lelf
   /usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libelf.a when searching for -lelf
   /usr/bin/ld: cannot find -lelf
   /usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libelf.so when searching for -lelf
   /usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libz.so when searching for -lz
   /usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libz.a when searching for -lz
   /usr/bin/ld: cannot find -lz
   /usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libz.so when searching for -lz
>> collect2: error: ld returned 1 exit status

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