Fixed compiler warnings about using unitialized variables

Author: montywi

sql/gcalc_tools.cc

@@ -131,7 +131,7 @@ int Gcalc_function::count_internal(const char *cur_func, uint set_type,
   uint n_ops= c_op & ~(op_any | op_not | v_mask);
   uint n_shape= c_op & ~(op_any | op_not | v_mask); /* same as n_ops */
   op_type v_state= (op_type) (c_op & v_mask);
-  int result= 0, t_counter;
+  int result= 0, t_counter= 0;
   const char *sav_cur_func= cur_func;
 
   // GCALC_DBUG_ENTER("Gcalc_function::count_internal");

sql/handler.cc

@@ -6506,7 +6506,7 @@ int ha_create_table(THD *thd, const char *path, const char *db,
     DBUG_ASSERT(share.key_info[share.keys].algorithm == HA_KEY_ALG_VECTOR);
     TABLE_SHARE index_share;
     char file_name[FN_REFLEN+1];
-    char index_file_name[FN_REFLEN+1], *index_file_name_end;
+    char index_file_name[FN_REFLEN+1], *UNINIT_VAR(index_file_name_end);
     Alter_info index_ainfo;
     HA_CREATE_INFO index_cinfo;
     char *path_end= strmov(file_name, path);

sql/spatial.cc

@@ -1616,7 +1616,7 @@ int Gis_line_string::is_valid(int *valid) const
   if (not_enough_points(m_data, num_points))
     return 1;
 
-  double x, y, previous_x, previous_y;
+  double x, y, UNINIT_VAR(previous_x), UNINIT_VAR(previous_y);
   for (uint32 i = 1; i <= num_points; i++)
   {
     String wkb= 0;

sql/sql_table.cc

@@ -8828,7 +8828,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
     {
       StringBuffer<NAME_LEN*3> tmp;
       append_drop_column(thd, &tmp, field);
-      my_error(ER_MISSING, MYF(0), table->s->table_name.str, tmp.c_ptr());
+      my_error(ER_MISSING, MYF(0), table->s->table_name.str, tmp.c_ptr_safe());
       goto err;
     }
     else if (drop && field->invisible < INVISIBLE_SYSTEM &&
@@ -8989,7 +8989,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
       append_drop_column(thd, &tmp, table->vers_start_field());
     if (!(dropped_sys_vers_fields & VERS_ROW_END))
       append_drop_column(thd, &tmp, table->vers_end_field());
-    my_error(ER_MISSING, MYF(0), table->s->table_name.str, tmp.c_ptr());
+    my_error(ER_MISSING, MYF(0), table->s->table_name.str, tmp.c_ptr_safe());
     goto err;
   }
   else if (alter_info->flags & ALTER_DROP_PERIOD && vers_system_invisible)
@@ -9993,7 +9993,7 @@ static bool fk_prepare_copy_alter_table(THD *thd, TABLE *table,
       buff.append('.');
       append_identifier(thd, &buff, tbl);
       my_error(ER_FK_COLUMN_CANNOT_DROP_CHILD, MYF(0), bad_column_name,
-               f_key->foreign_id->str, buff.c_ptr());
+               f_key->foreign_id->str, buff.c_ptr_safe());
       DBUG_RETURN(true);
     }
     /* FK_COLUMN_NOT_NULL error happens only when changing