Remove compiler warnings

extra/mariabackup/xtrabackup.cc

@@ -3022,7 +3022,7 @@ xb_validate_name(
 		exit(EXIT_FAILURE);
 	}
 	p = strpbrk(name, "/\\~");
-	if (p && p - name < NAME_LEN) {
+	if (p && (uint) (p - name) < NAME_LEN) {
 		msg("mariabackup: name `%s` is not valid.\n", name);
 		exit(EXIT_FAILURE);
 	}

plugin/simple_password_check/simple_password_check.c

@@ -15,6 +15,7 @@
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
 #include <mysqld_error.h>
+#include <my_attribute.h>
 #include <mysql/plugin_password_validation.h>
 #include <ctype.h>
 #include <string.h>
@@ -50,7 +51,9 @@ static int validate(MYSQL_CONST_LEX_STRING *username,
          others < min_others;
 }
 
-static void fix_min_length(MYSQL_THD thd, struct st_mysql_sys_var *var,
+static void fix_min_length(MYSQL_THD thd __attribute__((unused)),
+                           struct st_mysql_sys_var *var
+                           __attribute__((unused)),
                            void *var_ptr, const void *save)
 {
   unsigned int new_min_length;

sql/ha_partition.cc

@@ -223,8 +223,6 @@ static uint alter_table_flags(uint flags __attribute__((unused)))
           HA_FAST_CHANGE_PARTITION);
 }
 
-const uint32 ha_partition::NO_CURRENT_PART_ID= NOT_A_PARTITION_ID;
-
 /*
   Constructor method
 

sql/ha_partition.h

@@ -786,7 +786,7 @@ private:
                                           Query_cache_block_table
                                           **block_table,
                                           handler *file, uint *n);
-  static const uint NO_CURRENT_PART_ID;
+  static const uint NO_CURRENT_PART_ID= NOT_A_PARTITION_ID;
   int loop_extra(enum ha_extra_function operation);
   int loop_extra_alter(enum ha_extra_function operations);
   void late_extra_cache(uint partition_id);

storage/mroonga/lib/mrn_context_pool.cpp

@@ -50,7 +50,7 @@ namespace mrn {
         if (pool_) {
           ctx = static_cast<grn_ctx *>(pool_->data);
           list_pop(pool_);
-          if ((now - last_pull_time_) >= CLEAR_THREATHOLD_IN_SECONDS) {
+          if ((uint) (now - last_pull_time_) >= CLEAR_THREATHOLD_IN_SECONDS) {
             clear();
           }
         }

strings/json_lib.c

@@ -1386,7 +1386,7 @@ int json_find_paths_next(json_engine_t *je, json_find_paths_t *state)
           if (!json_key_matches(je, &key_name))
             continue;
         }
-        if (cur_step - state->paths[p_c].last_step == state->cur_depth)
+        if ((uint) (cur_step - state->paths[p_c].last_step) == state->cur_depth)
           path_found= TRUE;
         else
         {
@@ -1419,7 +1419,7 @@ int json_find_paths_next(json_engine_t *je, json_find_paths_t *state)
             cur_step->n_item == state->array_counters[state->cur_depth])
         {
           /* Array item matches. */
-          if (cur_step - state->paths[p_c].last_step == state->cur_depth)
+          if ((uint) (cur_step - state->paths[p_c].last_step) == state->cur_depth)
             path_found= TRUE;
           else
           {