Re: [akpm-mm:mm-nonmm-unstable 52/52] bch.c:undefined reference to `__paritydi2'

[Uros Bizjak <ubizjak@gmail.com>]

On Fri, Jan 31, 2025 at 2:02 PM kernel test robot <lkp@intel.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
> head:   1b9f78ccbffefb107cd92e20cfccd03ff2fa9d0e
> commit: 1b9f78ccbffefb107cd92e20cfccd03ff2fa9d0e [52/52] lib/bch.c: use __builtin_parity() when available
> config: loongarch-randconfig-001-20250131 (https://download.01.org/0day-ci/archive/20250131/202501312051.0vJPrrIL-lkp@intel.com/config)
> compiler: loongarch64-linux-gcc (GCC) 14.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250131/202501312051.0vJPrrIL-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/oe-kbuild-all/202501312051.0vJPrrIL-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
>    loongarch64-linux-ld: lib/bch.o: in function `solve_linear_system.constprop.0.isra.0':
> >> bch.c:(.text+0xd18): undefined reference to `__paritydi2'

Hm, my config cross-compiles to:

       bstrpick.d      $r4,$r4,31,0
       vrepli.d        $vr0,0
       vinsgr2vr.d     $vr0,$r4,0
       vpcnt.d $vr0,$vr0
       vpickve2gr.du   $r4,$vr0,0
       andi    $r4,$r4,1
       jr      $r1

It looks that __has_builtin() does not mean that there will be no call
to a library function?!

Uros.