Re: [linux-next:master 5302/7547] fs/open.c:152:1: error: unknown warning group '-Wattribute-alias', ignored

[Nathan Chancellor <nathan@kernel.org>]

On Fri, May 22, 2026 at 02:18:49AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   550604d6c9b9efc8d068aff94dc301694a7afdee
> commit: bc5ffe737f56ee2734597069ed71f48830549483 [5302/7547] Disable -Wattribute-alias for clang-23 and newer
> config: arm-defconfig (https://download.01.org/0day-ci/archive/20260522/202605220247.dQAHslyv-lkp@intel.com/config)
> compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260522/202605220247.dQAHslyv-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@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202605220247.dQAHslyv-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
> >> fs/open.c:152:1: error: unknown warning group '-Wattribute-alias', ignored [-Werror,-Wunknown-warning-option]
>      152 | SYSCALL_DEFINE2(truncate, const char __user *, path, long, length)
>          | ^
>    include/linux/syscalls.h:226:36: note: expanded from macro 'SYSCALL_DEFINE2'
>      226 | #define SYSCALL_DEFINE2(name, ...) SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
>          |                                    ^
>    include/linux/syscalls.h:236:2: note: expanded from macro 'SYSCALL_DEFINEx'
>      236 |         __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
>          |         ^
>    include/linux/syscalls.h:250:2: note: expanded from macro '__SYSCALL_DEFINEx'
>      250 |         __diag_ignore(clang, 23, "-Wattribute-alias",                   \
>          |         ^
>    note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
>    include/linux/compiler-clang.h:135:28: note: expanded from macro '__diag_clang_23'
>      135 | #define __diag_clang_23(s)      __diag(s)
>          |                                 ^
>    include/linux/compiler-clang.h:132:20: note: expanded from macro '__diag'
>      132 | #define __diag(s)               _Pragma(__diag_str(clang diagnostic s))
>          |                                 ^
>    <scratch space>:223:27: note: expanded from here
>      223 |  clang diagnostic ignored "-Wattribute-alias"
>          |                           ^

Please update your clang-23, this will be avoided with a newer version
from main that has the change that adds -Wattribute-alias.

-- 
Cheers,
Nathan