linux-kernel - [tip:timers/vdso 16/16] include/linux/compiler_types.h:568:5: warning: 'CC_HAS_TYPEOF

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Message-ID: <202601180747.rlQMyHZI-lkp@intel.com>
Date: Sun, 18 Jan 2026 08:05:56 +0800
From: kernel test robot <lkp@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 x86@...nel.org, Thomas Gleixner <tglx@...nel.org>
Subject: [tip:timers/vdso 16/16]
 include/linux/compiler_types.h:568:5: warning: 'CC_HAS_TYPEOF_UNQUAL' is not
 defined, evaluates to '0'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/vdso
head:   adc00a0daf1bb08915bceee9ae73cca682e7d5bb
commit: adc00a0daf1bb08915bceee9ae73cca682e7d5bb [16/16] compiler: Use __typeof_unqual__() for __unqual_scalar_typeof()
config: alpha-allnoconfig (https://download.01.org/0day-ci/archive/20260118/202601180747.rlQMyHZI-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260118/202601180747.rlQMyHZI-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601180747.rlQMyHZI-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/compiler.h:5,
                    from include/linux/export.h:5,
                    from arch/alpha/lib/divide.S:49:
>> include/linux/compiler_types.h:568:5: warning: 'CC_HAS_TYPEOF_UNQUAL' is not defined, evaluates to '0' [-Wundef]
     568 | #if CC_HAS_TYPEOF_UNQUAL || defined(__CHECKER__)
         |     ^~~~~~~~~~~~~~~~~~~~


vim +568 include/linux/compiler_types.h

   564	
   565	/*
   566	 * Use __typeof_unqual__() when available.
   567	 */
 > 568	#if CC_HAS_TYPEOF_UNQUAL || defined(__CHECKER__)
   569	# define USE_TYPEOF_UNQUAL 1
   570	#endif
   571	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki