linux-kernel - Re: [kbuild-all] proc.c:undefined reference to `strcmp'

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Date:   Thu, 24 Jan 2019 17:55:42 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        kbuild test robot <lkp@...el.com>
Cc:     Olof Johansson <olof@...om.net>, kbuild-all@...org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [kbuild-all] proc.c:undefined reference to `strcmp'


On 1/22/19 7:44 PM, Geert Uytterhoeven wrote:
> On Tue, Jan 22, 2019 at 11:11 AM kbuild test robot <lkp@...el.com> wrote:
>> It's probably a bug fix that unveils the link errors.
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   47bfa6d9dc8c060bf56554a465c9031e286d2f80
>> commit: 35004f2e55807a1a1491db24ab512dd2f770a130 lib/genalloc.c: include vmalloc.h
>> date:   2 weeks ago
>> config: m68k-allmodconfig (attached as .config)
>> compiler: m68k-linux-gnu-gcc (Debian 8.2.0-11) 8.2.0
>> reproduce:
>>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>          chmod +x ~/bin/make.cross
>>          git checkout 35004f2e55807a1a1491db24ab512dd2f770a130
>>          # save the attached .config to linux build tree
>>          GCC_VERSION=8.2.0 make.cross ARCH=m68k
>>
>> All errors (new ones prefixed by >>):
>>
>>     m68k-linux-gnu-ld: block/partitions/ldm.o: in function `ldm_partition':
>>     ldm.c:(.text+0x1900): undefined reference to `strcmp'
>>     m68k-linux-gnu-ld: ldm.c:(.text+0x1964): undefined reference to `strcmp'
>>     m68k-linux-gnu-ld: drivers/rtc/proc.o: in function `is_rtc_hctosys':
>>>> proc.c:(.text+0x18c): undefined reference to `strcmp'
>>     m68k-linux-gnu-ld: drivers/watchdog/watchdog_pretimeout.o: in function `watchdog_register_governor':
>>     watchdog_pretimeout.c:(.text+0x142): undefined reference to `strcmp'
>>     m68k-linux-gnu-ld: drivers/devfreq/devfreq.o: in function `try_then_request_governor':
>>     devfreq.c:(.text+0x9c6): undefined reference to `strcmp'
> I guess this bisection is a false positive. Have you just upgraded to gcc 8?

yes, we upgraded to gcc 8 recently.


> Gcc 8 replaces the strncmp() in is_rtc_hctosys() to strcmp().
> Will be fixed in v5.1 by
> https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git/commit/?h=for-v5.1&id=28713169d879b67be2ef2f84dcf54905de238294

Thanks for your explanation. we'll blacklist it.

Best Regards,
Rong Chen


>
> Gr{oetje,eeting}s,
>
>                          Geert
>