proc.c:undefined reference to `strcmp'

[kbuild test robot]

Hi Olof,

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'

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