Re: [PATCH v5 2/5] perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs

[kernel test robot]

Hi Ian,

kernel test robot noticed the following build errors:

[auto build test ERROR on perf-tools-next/perf-tools-next]
[also build test ERROR on next-20241022]
[cannot apply to tip/perf/core perf-tools/perf-tools linus/master acme/perf/core v6.12-rc4]
[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/Ian-Rogers/tools-api-io-Ensure-line_len_out-is-always-initialized/20241017-143759
base:   https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git perf-tools-next
patch link:    https://lore.kernel.org/r/20241017063555.366065-3-irogers%40google.com
patch subject: [PATCH v5 2/5] perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs
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/20241022/202410221809.rM67Lxz0-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/202410221809.rM67Lxz0-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   Makefile.config:665: No libunwind found. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR
     PERF_VERSION = 6.12.rc3.gd8463b89755f
>> util/hwmon_pmu.c:175:2: error: call to undeclared library function 'strlcpy' with type 'unsigned long (char *, const char *, unsigned long)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     175 |         strlcpy(fn_type, filename, sizeof(fn_type));
         |         ^
   util/hwmon_pmu.c:175:2: note: include the header <string.h> or explicitly provide a declaration for 'strlcpy'
   1 error generated.
   make[7]: *** [tools/build/Makefile.build:106: tools/perf/util/hwmon_pmu.o] Error 1
   make[7]: *** Waiting for unfinished jobs....
   make[6]: *** [tools/build/Makefile.build:158: util] Error 2
   make[5]: *** [Makefile.perf:789: tools/perf/perf-util-in.o] Error 2
   make[5]: *** Waiting for unfinished jobs....
   make[4]: *** [Makefile.perf:292: sub-make] Error 2
   make[3]: *** [Makefile:76: all] Error 2

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