Bug#25213 - Compiler warnings in MyISAM code

Compiler warnings due to non-matching conversion
specifications in format strings in DBUG_PRINT calls,
due to non-used parameters (in non-debug mode), and
due to seemingly uninitialized variables.

Initialized variables, declared parameters unused, and
casted DBUG_PRINT arguments to get rid of warnings.

myisam/mi_range.c

@@ -171,6 +171,7 @@ static double _mi_search_pos(register MI_INFO *info,
   uchar *keypos,*buff;
   double offset;
   DBUG_ENTER("_mi_search_pos");
+  LINT_INIT(max_keynr);
 
   if (pos == HA_OFFSET_ERROR)
     DBUG_RETURN(0.5);

myisam/mi_test1.c

@@ -562,7 +562,7 @@ static struct my_option my_long_options[] =
 
 static my_bool
 get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
-	       char *argument)
+	       char *argument __attribute__((unused)))
 {
   switch(optid) {
   case 'a':

myisam/mi_write.c

@@ -331,7 +331,7 @@ static int w_search(register MI_INFO *info, register MI_KEYDEF *keyinfo,
   my_bool was_last_key;
   my_off_t next_page, dupp_key_pos;
   DBUG_ENTER("w_search");
-  DBUG_PRINT("enter",("page: %ld",page));
+  DBUG_PRINT("enter",("page: %ld", (long) page));
 
   search_key_length= (comp_flag & SEARCH_FIND) ? key_length : USE_WHOLE_KEY;
   if (!(temp_buff= (uchar*) my_alloca((uint) keyinfo->block_length+
@@ -453,7 +453,7 @@ int _mi_insert(register MI_INFO *info, register MI_KEYDEF *keyinfo,
   uchar *endpos, *prev_key;
   MI_KEY_PARAM s_temp;
   DBUG_ENTER("_mi_insert");
-  DBUG_PRINT("enter",("key_pos: %lx",key_pos));
+  DBUG_PRINT("enter",("key_pos: %lx", (ulong) key_pos));
   DBUG_EXECUTE("key",_mi_print_key(DBUG_FILE,keyinfo->seg,key,USE_WHOLE_KEY););
 
   nod_flag=mi_test_if_nod(anc_buff);
@@ -475,7 +475,8 @@ int _mi_insert(register MI_INFO *info, register MI_KEYDEF *keyinfo,
     DBUG_PRINT("test",("t_length: %d  ref_len: %d",
 		       t_length,s_temp.ref_length));
     DBUG_PRINT("test",("n_ref_len: %d  n_length: %d  key_pos: %lx",
-		       s_temp.n_ref_length,s_temp.n_length,s_temp.key));
+		       s_temp.n_ref_length, s_temp.n_length,
+                       (ulong) s_temp.key));
   }
 #endif
   if (t_length > 0)
@@ -572,6 +573,7 @@ int _mi_split_page(register MI_INFO *info, register MI_KEYDEF *keyinfo,
   my_off_t new_pos;
   MI_KEY_PARAM s_temp;
   DBUG_ENTER("mi_split_page");
+  LINT_INIT(after_key);
   DBUG_DUMP("buff",(byte*) buff,mi_getint(buff));
 
   if (info->s->keyinfo+info->lastinx == keyinfo)
@@ -664,7 +666,8 @@ uchar *_mi_find_half_pos(uint nod_flag, MI_KEYDEF *keyinfo, uchar *page,
   } while (page < end);
   *return_key_length=length;
   *after_key=page;
-  DBUG_PRINT("exit",("returns: %lx  page: %lx  half: %lx",lastpos,page,end));
+  DBUG_PRINT("exit",("returns: %lx  page: %lx  half: %lx",
+                     (ulong) lastpos, (ulong) page, (ulong) end));
   DBUG_RETURN(lastpos);
 } /* _mi_find_half_pos */
 
@@ -718,7 +721,8 @@ static uchar *_mi_find_last_pos(MI_KEYDEF *keyinfo, uchar *page,
   }
   *return_key_length=last_length;
   *after_key=lastpos;
-  DBUG_PRINT("exit",("returns: %lx  page: %lx  end: %lx",prevpos,page,end));
+  DBUG_PRINT("exit",("returns: %lx  page: %lx  end: %lx",
+                     (ulong) prevpos, (ulong) page, (ulong) end));
   DBUG_RETURN(prevpos);
 } /* _mi_find_last_pos */
 
@@ -754,7 +758,7 @@ static int _mi_balance_page(register MI_INFO *info, MI_KEYDEF *keyinfo,
     next_page= _mi_kpos(info->s->base.key_reflength,
 			father_key_pos+father_keylength);
     buff=info->buff;
-    DBUG_PRINT("test",("use right page: %lu",next_page));
+    DBUG_PRINT("test",("use right page: %lu", (ulong) next_page));
   }
   else
   {
@@ -763,7 +767,7 @@ static int _mi_balance_page(register MI_INFO *info, MI_KEYDEF *keyinfo,
     next_page= _mi_kpos(info->s->base.key_reflength,father_key_pos);
 					/* Fix that curr_buff is to left */
     buff=curr_buff; curr_buff=info->buff;
-    DBUG_PRINT("test",("use left page: %lu",next_page));
+    DBUG_PRINT("test",("use left page: %lu", (ulong) next_page));
   }					/* father_key_pos ptr to parting key */
 
   if (!_mi_fetch_keypage(info,keyinfo,next_page,DFLT_INIT_HITS,info->buff,0))

myisam/rt_split.c

@@ -188,6 +188,10 @@ static int split_rtree_node(SplitStruct *node, int n_entries,
   int next_node;
   int i;
   SplitStruct *end = node + n_entries;
+  LINT_INIT(a);
+  LINT_INIT(b);
+  LINT_INIT(next);
+  LINT_INIT(next_node);
 
   if (all_size < min_size * 2)
   {