[ebiggers:wip-iscsi 1/1] drivers/target/iscsi/iscsi_target_auth.c:112:3: warning: label followed by a declaration is a C23 extension

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git wip-iscsi
head:   d75081a34e037b17f0f59228963a1cbd46afd4bd
commit: d75081a34e037b17f0f59228963a1cbd46afd4bd [1/1] scsi: target: iscsi: Use crypto library API
config: sparc64-allmodconfig (https://download.01.org/0day-ci/archive/20260505/202605051559.ZeZtd8t6-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/20260505/202605051559.ZeZtd8t6-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/202605051559.ZeZtd8t6-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/target/iscsi/iscsi_target_auth.c:112:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
     112 |                 static_assert(CHAP_MAX_DIGEST_SIZE >= MD5_DIGEST_SIZE);
         |                 ^
   include/linux/build_bug.h:79:34: note: expanded from macro 'static_assert'
      79 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                  ^
   include/linux/build_bug.h:80:41: note: expanded from macro '__static_assert'
      80 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                         ^
   drivers/target/iscsi/iscsi_target_auth.c:116:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
     116 |                 static_assert(CHAP_MAX_DIGEST_SIZE >= SHA1_DIGEST_SIZE);
         |                 ^
   include/linux/build_bug.h:79:34: note: expanded from macro 'static_assert'
      79 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                  ^
   include/linux/build_bug.h:80:41: note: expanded from macro '__static_assert'
      80 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                         ^
   drivers/target/iscsi/iscsi_target_auth.c:120:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
     120 |                 static_assert(CHAP_MAX_DIGEST_SIZE >= SHA256_DIGEST_SIZE);
         |                 ^
   include/linux/build_bug.h:79:34: note: expanded from macro 'static_assert'
      79 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                  ^
   include/linux/build_bug.h:80:41: note: expanded from macro '__static_assert'
      80 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                         ^
   drivers/target/iscsi/iscsi_target_auth.c:124:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
     124 |                 static_assert(CHAP_MAX_DIGEST_SIZE >= SHA3_256_DIGEST_SIZE);
         |                 ^
   include/linux/build_bug.h:79:34: note: expanded from macro 'static_assert'
      79 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                  ^
   include/linux/build_bug.h:80:41: note: expanded from macro '__static_assert'
      80 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                         ^
   4 warnings generated.


vim +112 drivers/target/iscsi/iscsi_target_auth.c

   107	
   108	static void chap_digest_final(struct chap_digest_ctx *ctx, u8 *out)
   109	{
   110		switch (ctx->digest_type) {
   111		case CHAP_DIGEST_MD5:
 > 112			static_assert(CHAP_MAX_DIGEST_SIZE >= MD5_DIGEST_SIZE);
   113			md5_final(&ctx->md5, out);
   114			break;
   115		case CHAP_DIGEST_SHA1:
   116			static_assert(CHAP_MAX_DIGEST_SIZE >= SHA1_DIGEST_SIZE);
   117			sha1_final(&ctx->sha1, out);
   118			break;
   119		case CHAP_DIGEST_SHA256:
   120			static_assert(CHAP_MAX_DIGEST_SIZE >= SHA256_DIGEST_SIZE);
   121			sha256_final(&ctx->sha256, out);
   122			break;
   123		case CHAP_DIGEST_SHA3_256:
   124			static_assert(CHAP_MAX_DIGEST_SIZE >= SHA3_256_DIGEST_SIZE);
   125			sha3_final(&ctx->sha3, out);
   126			break;
   127		default:
   128			WARN_ON_ONCE(1);
   129		}
   130	}
   131	

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