Re: [PATCH] tools: include: add proper strscpy() declaration

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

Hi Lucas,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v7.1-rc2 next-20260508]
[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/Lucas-Poupeau/tools-include-add-proper-strscpy-declaration/20260511-022707
base:   linus/master
patch link:    https://lore.kernel.org/r/20260504212301.63750-1-lucasp.linux%40gmail.com
patch subject: [PATCH] tools: include: add proper strscpy() declaration
config: x86_64-randconfig-012-20260511 (https://download.01.org/0day-ci/archive/20260511/202605110734.1Vga6ipo-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260511/202605110734.1Vga6ipo-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/202605110734.1Vga6ipo-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from parse-options.c:3:
>> tools/include/linux/string.h:32:8: error: unknown type name 'ssize_t'; did you mean 'size_t'?
      32 | extern ssize_t strscpy(char *dest, const char *src, size_t count);
         |        ^~~~~~~
         |        size_t
>> tools/include/linux/string.h:36:7: error: redundant redeclaration of 'str_error_r' [-Werror=redundant-decls]
      36 | char *str_error_r(int errnum, char *buf, size_t buflen);
         |       ^~~~~~~~~~~
   tools/include/linux/string.h:34:7: note: previous declaration of 'str_error_r' with type 'char *(int,  char *, size_t)' {aka 'char *(int,  char *, long unsigned int)'}
      34 | char *str_error_r(int errnum, char *buf, size_t buflen);
         |       ^~~~~~~~~~~
   In file included from exec-cmd.c:3:
>> tools/include/linux/string.h:32:8: error: unknown type name 'ssize_t'; did you mean 'size_t'?
      32 | extern ssize_t strscpy(char *dest, const char *src, size_t count);
         |        ^~~~~~~
         |        size_t
>> tools/include/linux/string.h:36:7: error: redundant redeclaration of 'str_error_r' [-Werror=redundant-decls]
      36 | char *str_error_r(int errnum, char *buf, size_t buflen);
         |       ^~~~~~~~~~~
   tools/include/linux/string.h:34:7: note: previous declaration of 'str_error_r' with type 'char *(int,  char *, size_t)' {aka 'char *(int,  char *, long unsigned int)'}
      34 | char *str_error_r(int errnum, char *buf, size_t buflen);
         |       ^~~~~~~~~~~
   In file included from run-command.c:9:
>> tools/include/linux/string.h:36:7: error: redundant redeclaration of 'str_error_r' [-Werror=redundant-decls]
      36 | char *str_error_r(int errnum, char *buf, size_t buflen);
         |       ^~~~~~~~~~~
   tools/include/linux/string.h:34:7: note: previous declaration of 'str_error_r' with type 'char *(int,  char *, size_t)' {aka 'char *(int,  char *, long unsigned int)'}
      34 | char *str_error_r(int errnum, char *buf, size_t buflen);
         |       ^~~~~~~~~~~
   In file included from help.c:5:
>> tools/include/linux/string.h:36:7: error: redundant redeclaration of 'str_error_r' [-Werror=redundant-decls]
      36 | char *str_error_r(int errnum, char *buf, size_t buflen);
         |       ^~~~~~~~~~~
   tools/include/linux/string.h:34:7: note: previous declaration of 'str_error_r' with type 'char *(int,  char *, size_t)' {aka 'char *(int,  char *, long unsigned int)'}
      34 | char *str_error_r(int errnum, char *buf, size_t buflen);
         |       ^~~~~~~~~~~
   cc1: all warnings being treated as errors
   cc1: all warnings being treated as errors
   make[6]: *** [tools/build/Makefile.build:95: tools/objtool/libsubcmd/exec-cmd.o] Error 1 shuffle=2681766322
   make[6]: *** [tools/build/Makefile.build:95: tools/objtool/libsubcmd/parse-options.o] Error 1 shuffle=2681766322
   cc1: all warnings being treated as errors
   make[6]: *** [tools/build/Makefile.build:95: tools/objtool/libsubcmd/run-command.o] Error 1 shuffle=2681766322
   cc1: all warnings being treated as errors
   make[6]: *** [tools/build/Makefile.build:95: tools/objtool/libsubcmd/help.o] Error 1 shuffle=2681766322
   make[6]: Target '__build' not remade because of errors.
   make[5]: *** [Makefile:78: tools/objtool/libsubcmd/libsubcmd-in.o] Error 2 shuffle=2681766322
   make[5]: Target 'tools/objtool/libsubcmd/libsubcmd.a' not remade because of errors.
   make[4]: *** [Makefile:135: tools/objtool/libsubcmd/libsubcmd.a] Error 2 shuffle=2681766322
   make[4]: Target 'all' not remade because of errors.
   make[3]: *** [Makefile:74: objtool] Error 2 shuffle=2681766322
   make[2]: *** [Makefile:1557: tools/objtool] Error 2 shuffle=2681766322
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2 shuffle=2681766322
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2 shuffle=2681766322
   make: Target 'prepare' not remade because of errors.


vim +32 tools/include/linux/string.h

    31	
  > 32	extern ssize_t strscpy(char *dest, const char *src, size_t count);
    33	
    34	char *str_error_r(int errnum, char *buf, size_t buflen);
    35	
  > 36	char *str_error_r(int errnum, char *buf, size_t buflen);
    37	

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