Fixed compiler warnings.

fsutils/mkfatfs/configfat.c

@@ -74,7 +74,7 @@ struct fat_config_s
  * offset 3.
  */
 
-const static uint8_t g_bootcodeblob[] =
+static const uint8_t g_bootcodeblob[] =
 {
   0x0e, 0x1f, 0xbe, 0x00, 0x7c, 0xac, 0x22, 0xc0, 0x74, 0x0b, 0x56,
   0xb4, 0x0e, 0xbb, 0x07, 0x00, 0xcd, 0x10, 0x5e, 0xeb, 0xf0, 0x32,
@@ -341,6 +341,8 @@ static inline uint8_t
 mkfatfs_clustersearchlimits(FAR struct fat_format_s *fmt,
                             FAR struct fat_var_s *var)
 {
+  UNUSED(var);
+
   uint8_t mxclustshift;
 
   /* Did the caller already pick the cluster size?  If not, the clustshift
@@ -721,7 +723,7 @@ mkfatfs_clustersearch(FAR struct fat_format_s *fmt,
 
   if (var->fv_fattype != 32)
     {
-      /* Calculate the number of sectors reqired to contain the selected
+      /* Calculate the number of sectors required to contain the selected
        * number of root directory entries.  This value is save in the var
        * structure but will be overwritten if FAT32 is selected.  FAT32 uses
        * a cluster chain for the root directory, so the concept of the number

fsutils/mkfatfs/writefat.c

@@ -67,7 +67,7 @@ static int mkfatfs_devwrite(FAR const struct fat_format_s *fmt,
 
   /* Convert the sector number to a byte offset */
 
-  if (sector < 0 || sector >= fmt->ff_nsectors)
+  if (sector < 0 || sector >= (off_t)fmt->ff_nsectors)
     {
       ferr("sector out of range: %ju\n", (intmax_t)sector);
       return -ESPIPE;
@@ -320,6 +320,8 @@ static inline void mkfatfs_initmbr(FAR struct fat_format_s *fmt,
 static inline void mkfatfs_initfsinfo(FAR struct fat_format_s *fmt,
                                       FAR struct fat_var_s *var)
 {
+  UNUSED(fmt);
+
   memset(var->fv_sect, 0, var->fv_sectorsize);
 
   /* 4@0: 0x41615252 = "RRaA" */
@@ -481,8 +483,8 @@ static inline int mkfatfs_writefat(FAR struct fat_format_s *fmt,
                                    FAR struct fat_var_s *var)
 {
   off_t offset = fmt->ff_rsvdseccount;
-  int fatno;
+  uint8_t fatno;
-  int sectno;
+  uint32_t sectno;
   int ret;
 
   /* Loop for each FAT copy */

netutils/netlib/netlib_parsehttpurl.c

@@ -51,7 +51,7 @@ int netlib_parsehttpurl(FAR const char *url, FAR uint16_t *port,
 {
   FAR const char *src = url;
   FAR char *dest;
-  int bytesleft;
+  size_t bytesleft;
   int ret = OK;
   size_t pathlen;
 

netutils/telnetd/telnetd_daemon.c

@@ -80,6 +80,8 @@
 
 int telnetd_daemon(int argc, FAR char *argv[])
 {
+  UNUSED(argc);
+
   FAR struct telnetd_s *daemon;
   union
   {

nshlib/nsh_command.c

@@ -788,6 +788,8 @@ static inline void help_allcmds(FAR struct nsh_vtbl_s *vtbl)
 #ifndef CONFIG_NSH_DISABLE_HELP
 static inline void help_builtins(FAR struct nsh_vtbl_s *vtbl)
 {
+  UNUSED(vtbl);
+
 #ifdef CONFIG_NSH_BUILTIN_APPS
   FAR const struct builtin_s *builtin;
   unsigned int builtins_per_line;
@@ -968,6 +970,8 @@ static int cmd_help(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 static int cmd_unrecognized(FAR struct nsh_vtbl_s *vtbl, int argc,
                             char **argv)
 {
+  UNUSED(argc);
+
   nsh_error(vtbl, g_fmtcmdnotfound, argv[0]);
   return ERROR;
 }
@@ -979,6 +983,10 @@ static int cmd_unrecognized(FAR struct nsh_vtbl_s *vtbl, int argc,
 #ifndef CONFIG_NSH_DISABLESCRIPT
 static int cmd_true(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(vtbl);
+  UNUSED(argc);
+  UNUSED(argv);
+
   return OK;
 }
 
@@ -991,6 +999,10 @@ static int cmd_true(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLESCRIPT
 static int cmd_false(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(vtbl);
+  UNUSED(argc);
+  UNUSED(argv);
+
   return ERROR;
 }
 #endif
@@ -1002,6 +1014,9 @@ static int cmd_false(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_EXIT
 static int cmd_exit(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+  UNUSED(argv);
+
   nsh_exit(vtbl, 0);
   return OK;
 }
@@ -1107,7 +1122,7 @@ int nsh_extmatch_count(FAR char *name, FAR int *matches, int namelen)
   int nr_matches = 0;
   int i;
 
-  for (i = 0; i < NUM_CMDS; i++)
+  for (i = 0; i < (int)NUM_CMDS; i++)
     {
       if (strncmp(name, g_cmdmap[i].cmd, namelen) == 0)
         {

nshlib/nsh_dbgcmds.c

@@ -71,6 +71,8 @@ struct dbgmem_s
 static int mem_parse(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv,
                      FAR struct dbgmem_s *mem)
 {
+  UNUSED(vtbl);
+
   FAR char *pcvalue = strchr(argv[1], '=');
   unsigned long lvalue = 0;
 
@@ -327,6 +329,8 @@ void nsh_dumpbuffer(FAR struct nsh_vtbl_s *vtbl, FAR const char *msg,
 #ifndef CONFIG_NSH_DISABLE_XD
 int cmd_xd(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
 {
+  UNUSED(argc);
+
   FAR char *addr;
   FAR char *endptr;
   int       nbytes;
@@ -493,6 +497,8 @@ int cmd_hexdump(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
 #ifdef HAVE_IRQINFO
 int cmd_irqinfo(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
 {
+  UNUSED(argc);
+
   return nsh_catfile(vtbl, argv[0], CONFIG_NSH_PROC_MOUNTPOINT "/irqs");
 }
 #endif

nshlib/nsh_envcmds.c

@@ -155,6 +155,8 @@ static inline FAR const char *nsh_getwd(const char *wd)
 static int nsh_dumpvar(FAR struct nsh_vtbl_s *vtbl, FAR void *arg,
                        FAR const char *pair)
 {
+  UNUSED(arg);
+
   nsh_output(vtbl, "%s\n", pair);
   return OK;
 }
@@ -360,6 +362,8 @@ int cmd_echo(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_ENV
 int cmd_env(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   return nsh_catfile(vtbl, argv[0],
                      CONFIG_NSH_PROC_MOUNTPOINT "/self/group/env");
 }
@@ -373,6 +377,9 @@ int cmd_env(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_PWD
 int cmd_pwd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+  UNUSED(argv);
+
   nsh_output(vtbl, "%s\n", nsh_getcwd());
   return OK;
 }
@@ -531,6 +538,8 @@ int cmd_set(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_UNSET
 int cmd_unset(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
 #if defined(CONFIG_NSH_VARS) || !defined(CONFIG_DISABLE_ENVIRON)
   int status;
 #endif

nshlib/nsh_fscmds.c

@@ -399,6 +399,8 @@ int cmd_basename(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_DIRNAME
 int cmd_dirname(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   FAR char *filename;
 
   /* Usage: dirname <path>
@@ -458,6 +460,8 @@ int cmd_cat(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #if defined(CONFIG_SYSLOG_DEVPATH) && !defined(CONFIG_NSH_DISABLE_DMESG)
 int cmd_dmesg(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   return nsh_catfile(vtbl, argv[0], CONFIG_SYSLOG_DEVPATH);
 }
 #endif
@@ -469,6 +473,8 @@ int cmd_dmesg(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_CP
 int cmd_cp(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   struct stat buf;
   FAR char *srcpath  = NULL;
   FAR char *destpath = NULL;
@@ -1269,6 +1275,7 @@ int cmd_mkfatfs(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
   FAR char *fullpath;
   bool badarg;
   int option;
+  int rootdirentries;
   int ret = ERROR;
 
   /* mkfatfs [-F <fatsize>] <block-driver> */
@@ -1289,8 +1296,12 @@ int cmd_mkfatfs(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
             break;
 
          case 'r':
-            fmt.ff_rootdirentries = atoi(optarg);
+            rootdirentries = atoi(optarg);
-            if (fmt.ff_rootdirentries < 0)
+            if (rootdirentries >= 0)
+              {
+                fmt.ff_rootdirentries = rootdirentries;
+              }
+            else
               {
                 nsh_error(vtbl, g_fmtargrange, argv[0]);
                 badarg = true;
@@ -1363,6 +1374,8 @@ int cmd_mkfatfs(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
     !defined(CONFIG_NSH_DISABLE_MKFIFO)
 int cmd_mkfifo(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   FAR char *fullpath = nsh_getfullpath(vtbl, argv[1]);
   int ret = ERROR;
 
@@ -1584,6 +1597,8 @@ int cmd_mksmartfs(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_MV
 int cmd_mv(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   FAR char *oldpath;
   FAR char *newpath;
   int ret;
@@ -1631,6 +1646,8 @@ errout_with_oldpath:
 #if !defined(CONFIG_NSH_DISABLE_READLINK) && defined(CONFIG_PSEUDOFS_SOFTLINKS)
 int cmd_readlink(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   FAR char *fullpath;
   ssize_t len;
 
@@ -1725,6 +1742,8 @@ static int unlink_recursive(FAR char *path)
 
 int cmd_rm(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   bool recursive = (strcmp(argv[1], "-r") == 0);
   FAR char *fullpath = nsh_getfullpath(vtbl, recursive ? argv[2] : argv[1]);
   char buf[PATH_MAX];
@@ -1763,6 +1782,8 @@ int cmd_rm(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_RMDIR
 int cmd_rmdir(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   FAR char *fullpath = nsh_getfullpath(vtbl, argv[1]);
   int ret = ERROR;
 
@@ -1790,6 +1811,8 @@ int cmd_rmdir(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_SOURCE
 int cmd_source(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   return nsh_script(vtbl, argv[0], argv[1]);
 }
 #endif
@@ -1802,6 +1825,8 @@ int cmd_source(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_CMP
 int cmd_cmp(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   FAR char *path1 = NULL;
   FAR char *path2 = NULL;
   off_t total_read = 0;
@@ -1880,7 +1905,7 @@ int cmd_cmp(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 
       /* A partial read indicates the end of file (usually) */
 
-      if (nbytesread1 < (size_t)sizeof(buf1))
+      if (nbytesread1 < (ssize_t)sizeof(buf1))
         {
           break;
         }
@@ -1913,6 +1938,8 @@ errout:
 #ifndef CONFIG_NSH_DISABLE_TRUNCATE
 int cmd_truncate(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   FAR char *fullpath;
   FAR char *endptr;
   struct stat buf;

nshlib/nsh_mmcmds.c

@@ -39,6 +39,8 @@
 
 int cmd_free(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   return nsh_catfile(vtbl, argv[0], CONFIG_NSH_PROC_MOUNTPOINT "/meminfo");
 }
 

nshlib/nsh_mntcmds.c

@@ -361,6 +361,8 @@ int cmd_nfsmount(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #if !defined(CONFIG_DISABLE_MOUNTPOINT) && !defined(CONFIG_NSH_DISABLE_UMOUNT)
 int cmd_umount(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   char *fullpath = nsh_getfullpath(vtbl, argv[1]);
   int ret = ERROR;
 

nshlib/nsh_modcmds.c

@@ -44,6 +44,8 @@
 
 int cmd_insmod(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   FAR void *handle;
 
   /* Usage: insmod <filepath> <modulename> */
@@ -66,6 +68,8 @@ int cmd_insmod(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 
 int cmd_rmmod(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   FAR void *handle;
   int ret;
 
@@ -99,6 +103,8 @@ int cmd_rmmod(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MODULE)
 int cmd_lsmod(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   FILE *stream;
 
   /* Usage: lsmod */

nshlib/nsh_netcmds.c

@@ -184,13 +184,13 @@ static inline void net_statistics(FAR struct nsh_vtbl_s *vtbl)
 #if !defined(CONFIG_NSH_DISABLE_IFUPDOWN) || !defined(CONFIG_NSH_DISABLE_IFCONFIG)
 static int ifconfig_callback(FAR struct nsh_vtbl_s *vtbl, FAR char *devname)
 {
-  char buffer[IFNAMSIZ + 12];
+  char buffer[NAME_MAX + 12];
 
   DEBUGASSERT(vtbl != NULL && devname != NULL);
 
   /* Construct the full path to the /proc/net entry for this device */
 
-  snprintf(buffer, IFNAMSIZ + 12,
+  snprintf(buffer, NAME_MAX + 12,
            CONFIG_NSH_PROC_MOUNTPOINT "/net/%s", devname);
   nsh_catfile(vtbl, "ifconfig", buffer);
 

nshlib/nsh_parse.c

@@ -794,7 +794,7 @@ static FAR char *nsh_filecat(FAR struct nsh_vtbl_s *vtbl, FAR char *s1,
   size_t allocsize;
   ssize_t nbytesread;
   FAR char *argument;
-  int index;
+  unsigned index;
   int fd;
   int ret;
 
@@ -1186,7 +1186,7 @@ static FAR char *nsh_argexpand(FAR struct nsh_vtbl_s *vtbl,
       while (len > 0 && *ptr != '\0')
         {
           FAR char *prev = working + len - 1;
-          int bcount;
+          unsigned bcount;
           bool quoted;
 
           /* Check if the current character is quoted */
@@ -2740,6 +2740,9 @@ int nsh_parse(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline)
 #if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_LOOPS)
 int cmd_break(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+  UNUSED(argv);
+
   FAR struct nsh_parser_s *np = &vtbl->np;
 
   /* Break outside of a loop is ignored */

nshlib/nsh_passwdcmds.c

@@ -44,6 +44,8 @@
 #ifndef CONFIG_NSH_DISABLE_USERADD
 int cmd_useradd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   int ret;
 
   ret = passwd_adduser(argv[1], argv[2]);
@@ -65,6 +67,8 @@ int cmd_useradd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_USERDEL
 int cmd_userdel(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   int ret;
 
   ret = passwd_deluser(argv[1]);
@@ -86,6 +90,8 @@ int cmd_userdel(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_PASSWD
 int cmd_passwd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   int ret;
 
   ret = passwd_update(argv[1], argv[2]);

nshlib/nsh_proccmds.c

@@ -226,6 +226,8 @@ static void nsh_parse_statusline(FAR char *line,
 static int ps_callback(FAR struct nsh_vtbl_s *vtbl, FAR const char *dirpath,
                        FAR struct dirent *entryp, FAR void *pvarg)
 {
+  UNUSED(pvarg);
+
   struct nsh_taskstatus_s status;
   FAR char *filepath;
   FAR char *line;
@@ -546,6 +548,8 @@ static int ps_callback(FAR struct nsh_vtbl_s *vtbl, FAR const char *dirpath,
 #ifndef CONFIG_NSH_DISABLE_EXEC
 int cmd_exec(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
 {
+  UNUSED(argc);
+
   FAR char *endptr;
   uintptr_t addr;
 
@@ -556,7 +560,7 @@ int cmd_exec(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
       return ERROR;
     }
 
-  nsh_output(vtbl, "Calling %p\n", (exec_t)addr);
+  nsh_output(vtbl, "Calling %p\n", (void*)addr);
   return ((exec_t)addr)();
 }
 #endif
@@ -568,6 +572,9 @@ int cmd_exec(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
 #ifndef CONFIG_NSH_DISABLE_PS
 int cmd_ps(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+  UNUSED(argv);
+
   nsh_output(vtbl, "%5s ", "PID");
   nsh_output(vtbl, "%5s ", "GROUP");
 
@@ -711,6 +718,8 @@ invalid_arg:
 #ifndef CONFIG_NSH_DISABLE_SLEEP
 int cmd_sleep(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   char *endptr;
   long secs;
 
@@ -733,6 +742,8 @@ int cmd_sleep(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #ifndef CONFIG_NSH_DISABLE_USLEEP
 int cmd_usleep(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   char *endptr;
   long usecs;
 

nshlib/nsh_syscmds.c

@@ -349,6 +349,8 @@ int cmd_reboot(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 #if defined(CONFIG_BOARDCTL_RESET_CAUSE) && !defined(CONFIG_NSH_DISABLE_RESET_CAUSE)
 int cmd_reset_cause(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   int ret;
   struct boardioc_reset_cause_s cause;
 

nshlib/nsh_telnetd.c

@@ -68,6 +68,9 @@ enum telnetd_state_e
 
 int nsh_telnetmain(int argc, FAR char *argv[])
 {
+  UNUSED(argc);
+  UNUSED(argv);
+
   FAR struct console_stdio_s *pstate = nsh_newconsole(true);
   FAR struct nsh_vtbl_s *vtbl;
   int ret;
@@ -353,6 +356,10 @@ int nsh_telnetstart(sa_family_t family)
 #ifndef CONFIG_NSH_DISABLE_TELNETD
 int cmd_telnetd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(vtbl);
+  UNUSED(argc);
+  UNUSED(argv);
+
   sa_family_t family = AF_UNSPEC;
 
   /* If both IPv6 and IPv4 are enabled, then the address family must

nshlib/nsh_test.c

@@ -76,6 +76,8 @@
 
 static inline int binaryexpression(FAR struct nsh_vtbl_s *vtbl, char **argv)
 {
+  UNUSED(vtbl);
+
   char *endptr;
   long integer1;
   long integer2;

nshlib/nsh_timcmds.c

@@ -291,6 +291,8 @@ errout_bad_parm:
 #ifndef CONFIG_NSH_DISABLE_TIME
 int cmd_time(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
+  UNUSED(argc);
+
   struct timespec start;
 #ifndef CONFIG_NSH_DISABLEBG
   bool bgsave;

system/readline/readline_common.c

@@ -67,7 +67,9 @@ struct cmdhist_s
 
 /* <esc>[K is the VT100 command erases to the end of the line. */
 
+#ifdef CONFIG_READLINE_ECHO
 static const char g_erasetoeol[] = VT100_CLEAREOL;
+#endif
 
 #ifdef CONFIG_READLINE_TABCOMPLETION
 /* Prompt string to present at the beginning of the line */
@@ -280,13 +282,13 @@ static void tab_completion(FAR struct rl_common_s *vtbl, char *buf,
               RL_PUTC(vtbl, ' ');
               RL_PUTC(vtbl, ' ');
 
-              for (j = 0; j < strlen(name); j++)
+              for (j = 0; j < (int)strlen(name); j++)
                 {
                   /* Removing characters that aren't common to all the
                    * matches.
                    */
 
-                  if (j < sizeof(tmp_name) && name[j] != tmp_name[j])
+                  if (j < (int)sizeof(tmp_name) && name[j] != tmp_name[j])
                     {
                       tmp_name[j] = '\0';
                     }
@@ -341,7 +343,7 @@ static void tab_completion(FAR struct rl_common_s *vtbl, char *buf,
 
           if (g_readline_prompt != NULL)
             {
-              for (i = 0; i < strlen(g_readline_prompt); i++)
+              for (i = 0; i < (int)strlen(g_readline_prompt); i++)
                 {
                   RL_PUTC(vtbl, g_readline_prompt[i]);
                 }

system/readline/readline_fd.c

@@ -188,6 +188,8 @@ static void readline_write(FAR struct rl_common_s *vtbl,
 
 ssize_t readline_fd(FAR char *buf, int buflen, int infd, int outfd)
 {
+  UNUSED(outfd);
+
   struct readline_s vtbl;
 
   /* Set up the vtbl structure */