[PATCH] kbuild: use objcopy to generate asm-offsets

[kernel test robot]

Hi Vegard,

kernel test robot noticed the following build errors:

[auto build test ERROR on masahiroy-kbuild/for-next]
[also build test ERROR on masahiroy-kbuild/fixes soc/for-next kvmarm/next kvm/queue uml/next krzk-mem-ctrl/for-next bpf-next/master bpf/master linus/master v6.11-rc5 next-20240829]
[cannot apply to tmlind-omap/for-next kvm/linux-next uml/fixes]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Vegard-Nossum/kbuild-use-objcopy-to-generate-asm-offsets/20240828-163854
base:   https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git for-next
patch link:    https://lore.kernel.org/r/20240828083605.3093701-1-vegard.nossum%40oracle.com
patch subject: [PATCH] kbuild: use objcopy to generate asm-offsets
config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20240829/202408292301.KMuvybe3-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240829/202408292301.KMuvybe3-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408292301.KMuvybe3-lkp@intel.com/

All errors (new ones prefixed by >>):

   {standard input}: Assembler messages:
>> {standard input}: Error: .size expression for main does not evaluate to a constant
   make[3]: *** [scripts/Makefile.build:244: scripts/mod/devicetable-offsets.o] Error 1
   make[3]: Target 'scripts/mod/' not remade because of errors.
   make[2]: *** [Makefile:1192: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:224: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:224: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.

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