MDEV-4243 Warnings/errors while compiling with clang

libmysqld/lib_sql.cc

@@ -440,7 +440,7 @@ static MYSQL_RES * emb_store_result(MYSQL *mysql)
 int emb_read_change_user_result(MYSQL *mysql)
 {
   mysql->net.read_pos= (uchar*)""; // fake an OK packet
-  return mysql_errno(mysql) ? packet_error : 1 /* length of the OK packet */;
+  return mysql_errno(mysql) ? (int)packet_error : 1 /* length of the OK packet */;
 }
 
 MYSQL_METHODS embedded_methods= 

mysys/default.c

@@ -814,7 +814,7 @@ static int search_default_file_with_ext(Process_option_func opt_handler,
       continue;
 
     /* Configuration File Directives */
-    if ((*ptr == '!'))
+    if (*ptr == '!')
     {
       if (recursion_level >= max_recursion_level)
       {

sql/log.cc

@@ -2253,7 +2253,7 @@ static int find_uniq_filename(char *name)
   my_dirend(dir_info);
 
   /* check if reached the maximum possible extension number */
-  if ((max_found == MAX_LOG_UNIQUE_FN_EXT))
+  if (max_found == MAX_LOG_UNIQUE_FN_EXT)
   {
     sql_print_error("Log filename extension number exhausted: %06lu. \
 Please fix this by archiving old logs and \

sql/log_event.cc

@@ -1369,7 +1369,7 @@ failed my_b_read"));
   Log_event *res=  0;
 #ifndef max_allowed_packet
   THD *thd=current_thd;
-  uint max_allowed_packet= thd ? slave_max_allowed_packet:~(ulong)0;
+  uint max_allowed_packet= thd ? slave_max_allowed_packet:~(uint)0;
 #endif
 
   if (data_len > max_allowed_packet)

sql/opt_sum.cc

@@ -84,7 +84,7 @@ static ulonglong get_exact_record_count(List<TABLE_LIST> &tables)
   while ((tl= ti++))
   {
     ha_rows tmp= tl->table->file->records();
-    if ((tmp == HA_POS_ERROR))
+    if (tmp == HA_POS_ERROR)
       return ULONGLONG_MAX;
     count*= tmp;
   }

storage/csv/ha_tina.cc

@@ -1436,9 +1436,9 @@ int ha_tina::rnd_end()
       DBUG_RETURN(-1);
 
     /* Open the file again */
-    if (((data_file= mysql_file_open(csv_key_file_data,
+    if ((data_file= mysql_file_open(csv_key_file_data,
                                     share->data_file_name,
-                                     O_RDONLY, MYF(MY_WME))) == -1))
+                                    O_RDONLY, MYF(MY_WME))) == -1)
       DBUG_RETURN(my_errno ? my_errno : -1);
     /*
       As we reopened the data file, increase share->data_file_version 

storage/federatedx/ha_federatedx.cc

@@ -764,7 +764,7 @@ static int parse_url(MEM_ROOT *mem_root, FEDERATEDX_SHARE *share, TABLE *table,
         user:@hostname:port/db/table
         Then password is a null string, so set to NULL
       */
-      if ((share->password[0] == '\0'))
+      if (share->password[0] == '\0')
         share->password= NULL;
     }
 

storage/innobase/sync/sync0sync.c

@@ -316,9 +316,9 @@ mutex_create_func(
 
 	/* NOTE! The very first mutexes are not put to the mutex list */
 
-	if ((mutex == &mutex_list_mutex)
+	if (mutex == &mutex_list_mutex
 #ifdef UNIV_SYNC_DEBUG
-	    || (mutex == &sync_thread_mutex)
+	    || mutex == &sync_thread_mutex
 #endif /* UNIV_SYNC_DEBUG */
 	    ) {
 

storage/maria/ma_bitmap.c

@@ -135,8 +135,7 @@ const char *bits_to_txt[]=
   "tail 00-40 % full", "tail 40-80 % full", "tail/blob full"
 };
 
-/*#define WRONG_BITMAP_FLUSH 1*/ /*define only for provoking bugs*/
-#undef WRONG_BITMAP_FLUSH
+#define WRONG_BITMAP_FLUSH 0 /*define to 1 only for provoking bugs*/
 
 static my_bool _ma_read_bitmap_page(MARIA_HA *info,
                                     MARIA_FILE_BITMAP *bitmap,
@@ -164,11 +163,7 @@ static inline my_bool write_changed_bitmap(MARIA_SHARE *share,
   */
   bitmap->changed_not_flushed= 1;
 
-  if ((bitmap->non_flushable == 0)
-#ifdef WRONG_BITMAP_FLUSH
-      || 1
-#endif
-      )
+  if ((bitmap->non_flushable == 0) || WRONG_BITMAP_FLUSH)
   {
     res= pagecache_write(share->pagecache,
                                  &bitmap->file, bitmap->page, 0,
@@ -495,7 +490,7 @@ my_bool _ma_bitmap_flush_all(MARIA_SHARE *share)
   {
     bitmap->flush_all_requested++;
     bitmap->waiting_for_non_flushable++;
-#ifndef WRONG_BITMAP_FLUSH
+#if !WRONG_BITMAP_FLUSH
     while (bitmap->non_flushable > 0)
     {
       DBUG_PRINT("info", ("waiting for bitmap to be flushable"));

storage/maria/ma_blockrec.c

@@ -7123,7 +7123,7 @@ my_bool _ma_apply_undo_row_delete(MARIA_HA *info, LSN undo_lsn,
 
       memcpy(field_pos, field_length_data, size_length);
       field_length_data+= size_length;
-      memcpy(field_pos + size_length, &header, sizeof(&header));
+      memcpy(field_pos + size_length, &header, sizeof(header));
       header+= blob_length;
       *blob_lengths++= blob_length;
       break;

storage/maria/ma_test3.c

@@ -114,7 +114,7 @@ int main(int argc,char **argv)
       sleep(1);
       return 0;
     }
-    rnd(1);
+    (void)rnd(1);
   }
 
   for (i=0 ; i < forks ; i++)

storage/xtradb/sync/sync0sync.c

@@ -315,9 +315,9 @@ mutex_create_func(
 
 	/* NOTE! The very first mutexes are not put to the mutex list */
 
-	if ((mutex == &mutex_list_mutex)
+	if (mutex == &mutex_list_mutex
 #ifdef UNIV_SYNC_DEBUG
-	    || (mutex == &sync_thread_mutex)
+	    || mutex == &sync_thread_mutex
 #endif /* UNIV_SYNC_DEBUG */
 	    ) {
 

strings/decimal.c

@@ -669,7 +669,7 @@ int decimal_shift(decimal_t *dec, int shift)
     if (do_left)
     {
       do_mini_left_shift(dec, l_mini_shift, beg, end);
-      mini_shift=- l_mini_shift;
+      mini_shift= -l_mini_shift;
     }
     else
     {