[PATCH 2/3] lib/tests: Add randstruct KUnit test

[kernel test robot]

Hi Kees,

kernel test robot noticed the following build warnings:

[auto build test WARNING on kees/for-next/hardening]
[also build test WARNING on linus/master v6.15-rc3 next-20250424]
[cannot apply to akpm-mm/mm-nonmm-unstable soc/for-next]
[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/Kees-Cook/randstruct-gcc-plugin-Remove-bogus-void-member/20250427-093946
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/hardening
patch link:    https://lore.kernel.org/r/20250427013836.877214-2-kees%40kernel.org
patch subject: [PATCH 2/3] lib/tests: Add randstruct KUnit test
config: riscv-randconfig-001-20250427 (https://download.01.org/0day-ci/archive/20250427/202504271150.Be642Srg-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250427/202504271150.Be642Srg-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/202504271150.Be642Srg-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> lib/tests/randstruct_kunit.c:36:36: warning: '_Static_assert' with no message is a C23 extension [-Wc23-extensions]
      36 | _Static_assert(MEMBER_NAME_MAX == 8);
         |                                    ^
         |                                    , ""
   1 warning generated.


vim +/_Static_assert +36 lib/tests/randstruct_kunit.c

    19	
    20	#define DO_MANY_MEMBERS(macro, args...)	\
    21		macro(a, args)			\
    22		macro(b, args)			\
    23		macro(c, args)			\
    24		macro(d, args)			\
    25		macro(e, args)			\
    26		macro(f, args)			\
    27		macro(g, args)			\
    28		macro(h, args)
    29	
    30	#define do_enum(x, ignored)	MEMBER_NAME_ ## x,
    31	enum randstruct_member_names {
    32		DO_MANY_MEMBERS(do_enum)
    33		MEMBER_NAME_MAX,
    34	};
    35	/* Make sure the macros are working: want 8 test members. */
  > 36	_Static_assert(MEMBER_NAME_MAX == 8);
    37	

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