configure.in

    don't define UNIV_DEBUG in CFLAGS/CXXFLAGS anymore
sql/mysqld.cc
    hide from the user options that do nothing
sql/sql_update.cc
    better fix for uninitialized used_index

configure.in

@@ -1677,8 +1677,8 @@ then
 elif test "$with_debug" = "full"
 then
   # Full debug. Very slow in some cases
-  CFLAGS="$DEBUG_CFLAGS -DDBUG_ON -DSAFE_MUTEX -DSAFEMALLOC -DUNIV_DEBUG $CFLAGS"
-  CXXFLAGS="$DEBUG_CXXFLAGS -DDBUG_ON -DSAFE_MUTEX -DSAFEMALLOC -DUNIV_DEBUG $CXXFLAGS"
+  CFLAGS="$DEBUG_CFLAGS -DDBUG_ON -DSAFE_MUTEX -DSAFEMALLOC $CFLAGS"
+  CXXFLAGS="$DEBUG_CXXFLAGS -DDBUG_ON -DSAFE_MUTEX -DSAFEMALLOC $CXXFLAGS"
 else
   # Optimized version. No debug
   CFLAGS="$OPTIMIZE_CFLAGS -DDBUG_OFF $CFLAGS"

sql/mysqld.cc

@@ -5215,6 +5215,7 @@ The minimum value for this variable is 4096.",
    (gptr*) &sync_binlog_period,
    (gptr*) &sync_binlog_period, 0, GET_ULONG, REQUIRED_ARG, 0, 0, ~0L, 0, 1,
    0},
+#ifdef DOES_NOTHING_YET
   {"sync-replication", OPT_SYNC_REPLICATION,
    "Enable synchronous replication",
    (gptr*) &global_system_variables.sync_replication,
@@ -5230,6 +5231,7 @@ The minimum value for this variable is 4096.",
    (gptr*) &global_system_variables.sync_replication_timeout,
    (gptr*) &global_system_variables.sync_replication_timeout,
    0, GET_ULONG, REQUIRED_ARG, 10, 0, ~0L, 0, 1, 0},
+#endif
   {"sync-frm", OPT_SYNC_FRM, "Sync .frm to disk on create. Enabled by default",
    (gptr*) &opt_sync_frm, (gptr*) &opt_sync_frm, 0, GET_BOOL, NO_ARG, 1, 0,
    0, 0, 0, 0},

sql/sql_update.cc

@@ -61,7 +61,7 @@ int mysql_update(THD *thd,
   bool		safe_update= thd->options & OPTION_SAFE_UPDATES;
   bool		used_key_is_modified, transactional_table, log_delayed;
   int		error=0;
-  uint		used_index= MAX_KEY;
+  uint		used_index;
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
   uint		want_privilege;
 #endif
@@ -159,10 +159,11 @@ int mysql_update(THD *thd,
   init_ftfuncs(thd, &thd->lex->select_lex, 1);
   /* Check if we are modifying a key that we are used to search with */
   if (select && select->quick)
+  {
+    used_index=select->quick->index;
     used_key_is_modified= (!select->quick->unique_key_range() &&
-			   check_if_key_used(table,
-					     (used_index=select->quick->index),
-					     fields));
+			   check_if_key_used(table, used_index, fields));
+  }
   else if ((used_index=table->file->key_used_on_scan) < MAX_KEY)
     used_key_is_modified=check_if_key_used(table, used_index, fields);
   else