tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f69d02e37a85645aa90d18cacfff36dba370f797
commit: d71fa5c9763c24dd997a2fa4feb7a13a95bab42c bpf: Add kernel module with user mode driver that populates bpffs.
date:   7 months ago
config: i386-randconfig-a002-20210303 (attached as .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 attached .config to linux build tree
        make W=1 ARCH=i386 

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