undefined reference to `dib3000mc_pid_parse'

[kbuild test robot <fengguang.wu@intel.com>]

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Hi Joe,

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:   af56ff27eba54fceee5f5643e79bf6531f2e1739
commit: cb984d101b30eb7478d32df56a0023e4603cba7f compiler-gcc: integrate the various compiler-gcc[345].h files
date:   1 year, 2 months ago
config: x86_64-randconfig-n0-08281459 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        git checkout cb984d101b30eb7478d32df56a0023e4603cba7f
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `dibusb_dib3000mc_frontend_attach':
>> (.text+0x19298d): undefined reference to `dib3000mc_pid_parse'
   drivers/built-in.o: In function `dibusb_dib3000mc_frontend_attach':
>> (.text+0x192995): undefined reference to `dib3000mc_pid_control'
   drivers/built-in.o: In function `dibusb_dib3000mc_tuner_attach':
>> (.text+0x192bd7): undefined reference to `dib3000mc_set_config'

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