Fixed compiler warnings about possible uninitialized variables

sql/log.cc

@@ -2420,7 +2420,7 @@ static int find_uniq_filename(char *name, ulong next_log_number)
   char                  buff[FN_REFLEN], ext_buf[FN_REFLEN];
   struct st_my_dir     *dir_info;
   reg1 struct fileinfo *file_info;
-  ulong                 max_found, next, number;
+  ulong                 max_found, next, UNINIT_VAR(number);
   size_t		buf_length, length;
   char			*start, *end;
   int                   error= 0;

sql/opt_range.cc

@@ -6729,7 +6729,7 @@ static TRP_RANGE *get_key_scans_params(PARAM *param, SEL_TREE *tree,
                                        bool update_tbl_stats,
                                        double read_time)
 {
-  uint idx, best_idx;
+  uint idx, UNINIT_VAR(best_idx);
   SEL_ARG *key_to_read= NULL;
   ha_rows UNINIT_VAR(best_records);              /* protected by key_to_read */
   uint    UNINIT_VAR(best_mrr_flags),            /* protected by key_to_read */

sql/sql_cte.cc

@@ -664,7 +664,7 @@ void With_element::move_anchors_ahead()
 {
   st_select_lex *next_sl;
   st_select_lex *new_pos= spec->first_select();
-  st_select_lex *last_sl;
+  st_select_lex *UNINIT_VAR(last_sl);
   new_pos->linkage= UNION_TYPE;
   for (st_select_lex *sl= new_pos; sl; sl= next_sl)
   {

sql/sql_partition.cc

@@ -8071,8 +8071,11 @@ int create_partition_name(char *out, size_t outlen, const char *in1,
     end= strxnmov(out, outlen-1, in1, "#P#", transl_part, NullS);
   else if (name_variant == TEMP_PART_NAME)
     end= strxnmov(out, outlen-1, in1, "#P#", transl_part, "#TMP#", NullS);
-  else if (name_variant == RENAMED_PART_NAME)
+  else
+  {
+    DBUG_ASSERT(name_variant == RENAMED_PART_NAME);
     end= strxnmov(out, outlen-1, in1, "#P#", transl_part, "#REN#", NullS);
+  }
   if (end - out == static_cast<ptrdiff_t>(outlen-1))
   {
     my_error(ER_PATH_LENGTH, MYF(0), longest_str(in1, transl_part));
@@ -8112,9 +8115,12 @@ int create_subpartition_name(char *out, size_t outlen,
   else if (name_variant == TEMP_PART_NAME)
     end= strxnmov(out, outlen-1, in1, "#P#", transl_part_name,
                   "#SP#", transl_subpart_name, "#TMP#", NullS);
-  else if (name_variant == RENAMED_PART_NAME)
+  else
+  {
+    DBUG_ASSERT(name_variant == RENAMED_PART_NAME);
     end= strxnmov(out, outlen-1, in1, "#P#", transl_part_name,
                   "#SP#", transl_subpart_name, "#REN#", NullS);
+  }
   if (end - out == static_cast<ptrdiff_t>(outlen-1))
   {
     my_error(ER_PATH_LENGTH, MYF(0),

sql/table.cc

@@ -997,7 +997,7 @@ bool parse_vcol_defs(THD *thd, MEM_ROOT *mem_root, TABLE *table,
   Virtual_column_info **check_constraint_ptr= table->check_constraints;
   sql_mode_t saved_mode= thd->variables.sql_mode;
   Query_arena backup_arena;
-  Virtual_column_info *vcol;
+  Virtual_column_info *vcol= 0;
   StringBuffer<MAX_FIELD_WIDTH> expr_str;
   bool res= 1;
   DBUG_ENTER("parse_vcol_defs");
@@ -1168,7 +1168,7 @@ int TABLE_SHARE::init_from_binary_frm_image(THD *thd, bool write,
   uint new_frm_ver, field_pack_length, new_field_pack_flag;
   uint interval_count, interval_parts, read_length, int_length;
   uint db_create_options, keys, key_parts, n_length;
-  uint com_length, null_bit_pos, mysql57_vcol_null_bit_pos, bitmap_count;
+  uint com_length, null_bit_pos, UNINIT_VAR(mysql57_vcol_null_bit_pos), bitmap_count;
   uint i;
   bool use_hash, mysql57_null_bits= 0;
   char *keynames, *names, *comment_pos;
@@ -2104,6 +2104,7 @@ int TABLE_SHARE::init_from_binary_frm_image(THD *thd, bool write,
       }   
     }
 
+    key_first_info= keyinfo;
     for (uint key=0 ; key < keys ; key++,keyinfo++)
     {
       uint usable_parts= 0;
@@ -2121,9 +2122,6 @@ int TABLE_SHARE::init_from_binary_frm_image(THD *thd, bool write,
                keyinfo->name_length+1);
       }
 
-      if (!key)
-        key_first_info= keyinfo;
-
       if (ext_key_parts > share->key_parts && key)
       {
         KEY_PART_INFO *new_key_part= (keyinfo-1)->key_part +

storage/maria/ma_open.c

@@ -280,7 +280,7 @@ MARIA_HA *maria_open(const char *name, int mode, uint open_flags)
   size_t info_length;
   char name_buff[FN_REFLEN], org_name[FN_REFLEN], index_name[FN_REFLEN],
        data_name[FN_REFLEN];
-  uchar *disk_cache, *disk_pos, *end_pos;
+  uchar *UNINIT_VAR(disk_cache), *disk_pos, *end_pos;
   MARIA_HA info, *UNINIT_VAR(m_info), *old_info;
   MARIA_SHARE share_buff,*share;
   double *rec_per_key_part;