Hi Sergei, Current 5.3 fails as follows: http://buildbot.askmonty.org/buildbot/builders/mac-mini-x86-dbg/builds/771/s... g++ -DMYSQL_SERVER -DDEFAULT_MYSQL_HOME='"/usr/local/mysql"' -DMYSQL_DATADIR='"/usr/local/mysql/var"' -DSHAREDIR='"/usr/local/mysql/share/mysql"' -DPLUGINDIR='"/usr/local/mysql/lib/mysql/plugin"' -DHAVE_EVENT_SCHEDULER -DHAVE_CONFIG_H -I. -I../include -I../include -I../include -I../regex -I. -I../extra/libevent -Wall -Wextra -Wunused -Wwrite-strings -Wno-strict-aliasing -Werror -DFORCE_INIT_OF_VARS -Wno-unused-parameter -g -Wall -Wextra -Wunused -Wwrite-strings -Wno-uninitialized -Wno-unused-parameter -Wnon-virtual-dtor -felide-constructors -fno-exceptions -fno-rtti -mtune=native -DUNIV_MUST_NOT_INLINE -DEXTRA_DEBUG -DSAFEMALLOC -DPEDANTIC_SAFEMALLOC -O0 -g3 -gdwarf-2 -O2 -Wuninitialized -DFORCE_INIT_OF_VARS -fno-implicit-templates -fno-exceptions -fno-rtti -D_P1003_1B_VISIBLE -DSIGNAL_WITH_VIO_CLOSE -DSIGNALS_DONT_BREAK_READ -DIGNORE_SIGHUP_SIGQUIT -DDONT_DECLARE_CXA_PURE_VIRTUAL -MT debug_sync.o -MD -MP -MF .deps/debug_sync.Tpo -c -o debug_sync.o debug_sync.cc cc1plus: warnings being treated as errors filesort.cc: In function 'void make_sortkey(SORTPARAM*, uchar*, uchar*)': filesort.cc:878: warning: 'value' may be used uninitialized in this function make[3]: *** [filesort.o] Error 1 make[3]: *** Waiting for unfinished jobs.... It is not apparent for me whether this is a real error or not, bazaar history shows that the failure is in your code of MWL#173. Could you please take a look? BR Sergey -- Sergey Petrunia, Software Developer Monty Program AB, http://askmonty.org Blog: http://s.petrunia.net/blog