编译 libmemcached 的 undefined reference to `__sync_fetch_and_add_4'

编译 libmemcached 0.37 结果出现这个错误。

  CC     clients/ms_thread.o
  CCLD   clients/memslap
clients/ms_conn.o: In function `ms_get_udp_request_id':
/data2/build/libmemcached-0.37/clients/ms_conn.c:184: undefined reference to `__sync_fetch_and_add_4'
clients/ms_conn.o: In function `ms_reconn_socks':
/data2/build/libmemcached-0.37/clients/ms_conn.c:1055: undefined reference to `__sync_fetch_and_add_4'
clients/ms_conn.o: In function `ms_reconn':
/data2/build/libmemcached-0.37/clients/ms_conn.c:924: undefined reference to `__sync_fetch_and_add_4'
/data2/build/libmemcached-0.37/clients/ms_conn.c:960: undefined reference to `__sync_fetch_and_add_4'
clients/ms_thread.o: In function `ms_setup_thread':
/data2/build/libmemcached-0.37/clients/ms_thread.c:215: undefined reference to `__sync_fetch_and_add_4'
clients/ms_thread.o:/data2/build/libmemcached-0.37/clients/ms_thread.c:198: more undefined references to `__sync_fetch_and_add_4' follow
collect2: ld returned 1 exit status
make[2]: *** [clients/memslap] Error 1
make[2]: Leaving directory `/data2/build/libmemcached-0.37'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/data2/build/libmemcached-0.37'
make: *** [all] Error 2

当时使用的参数是

./configure --prefix=/data2/server/ --with-libevent-prefix=/data2/server/

后来又是

./configure --prefix=/data2/server/ --with-libevent-prefix=/data2/server/  --disable-64bit

还是不行

后来绕墙看到了这个
libmemcached undefined reference to `__sync_fetch_and_add_4′
改configure参数为

./configure --prefix=/data2/server/ --with-libevent-prefix=/data2/server/   --disable-64bit CFLAGS="-O3 -march=i686"

make clean install 就好了