nolibc-test.c:1543:15: error: implicit declaration of function 'sendfile'

[kernel test robot <lkp@intel.com>]

:::::: 
:::::: Manual check reason: "low confidence bisect report"
:::::: 

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Daniel Palmer <daniel@thingy.jp>
CC: 0day robot <lkp@intel.com>

tree:   https://github.com/intel-lab-lkp/linux/commits/Daniel-Palmer/tools-nolibc-Add-sendfile/20260828-193204
head:   89dfe1bb90b6b8ee0de6f320cc97fa18aff2d6f0
commit: 89dfe1bb90b6b8ee0de6f320cc97fa18aff2d6f0 selftests/nolibc: Add basic test for sendfile()
date:   2 days ago
:::::: branch date: 2 days ago
:::::: commit date: 2 days ago
config: i386-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260830/202608301704.LzKdiEDV-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260830/202608301704.LzKdiEDV-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/r/202608301704.LzKdiEDV-lkp@intel.com/

All errors (new ones prefixed by >>):

   nolibc-test.c: In function 'test_sendfile':
>> nolibc-test.c:1543:15: error: implicit declaration of function 'sendfile' [-Wimplicit-function-declaration]
    1543 |         ret = sendfile(out_fd, in_fd, NULL, data_sz);
         |               ^~~~~~~~

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