warning: unknown warning option '-Wrestrict'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2cf0f715623872823a72e451243bbf555d10d032
commit: feb843a469fb0ab00d2d23cfb9bcc379791011bb kbuild: add $(CLANG_FLAGS) to KBUILD_CPPFLAGS
date:   4 months ago
config: um-allnoconfig (https://download.01.org/0day-ci/archive/20230919/202309192257.IAbw1lnx-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230919/202309192257.IAbw1lnx-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309192257.IAbw1lnx-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> warning: unknown warning option '-Wrestrict' [-Wunknown-warning-option]
>> warning: unknown warning option '-Wformat-overflow'; did you mean '-Wshift-overflow'? [-Wunknown-warning-option]
>> warning: unknown warning option '-Wformat-truncation' [-Wunknown-warning-option]
>> warning: unknown warning option '-Wstringop-overflow'; did you mean '-Wshift-overflow'? [-Wunknown-warning-option]
   arch/x86/um/user-offsets.c:17:6: warning: no previous prototype for function 'foo' [-Wmissing-prototypes]
      17 | void foo(void)
         |      ^
   arch/x86/um/user-offsets.c:17:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      17 | void foo(void)
         | ^
         | static 
   5 warnings generated.
   error: unknown warning option '-Wrestrict' [-Werror,-Wunknown-warning-option]
   error: unknown warning option '-Wformat-overflow'; did you mean '-Wshift-overflow'? [-Werror,-Wunknown-warning-option]
   error: unknown warning option '-Wformat-truncation' [-Werror,-Wunknown-warning-option]
   error: unknown warning option '-Wstringop-overflow'; did you mean '-Wshift-overflow'? [-Werror,-Wunknown-warning-option]
   make[2]: *** [scripts/Makefile.build:252: scripts/mod/empty.o] Error 1
   error: unknown warning option '-Wrestrict' [-Werror,-Wunknown-warning-option]
   error: unknown warning option '-Wformat-overflow'; did you mean '-Wshift-overflow'? [-Werror,-Wunknown-warning-option]
   error: unknown warning option '-Wformat-truncation' [-Werror,-Wunknown-warning-option]
   error: unknown warning option '-Wstringop-overflow'; did you mean '-Wshift-overflow'? [-Werror,-Wunknown-warning-option]
   make[2]: *** [scripts/Makefile.build:114: scripts/mod/devicetable-offsets.s] Error 1
   make[2]: Target 'scripts/mod/' not remade because of errors.
   make[1]: *** [Makefile:1286: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:226: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.

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