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安装pecl的memcached前，需要先安装libmemcached，但 是今天在centos上安装时，遇到了诡异的错误： clients/ms_conn.o: In function `ms_get_udp_request_id’: /download/libmemcached-0.38/clients/ms_conn.c:194: undefined reference to `__sync_fetch_and_add_4′ clients/ms_conn.o: In function `ms_reconn_socks’: /download/libmemcached-0.38/clients/ms_conn.c:1051: undefined reference to `__sync_fetch_and_add_4′ clients/ms_conn.o: In function `ms_reconn’: /download/libmemcached-0.38/clients/ms_conn.c:919: undefined reference to `__sync_fetch_and_add_4′ /download/libmemcached-0.38/clients/ms_conn.c:956: undefined reference to `__sync_fetch_and_add_4′ clients/ms_thread.o: In function `ms_setup_thread’: /download/libmemcached-0.38/clients/ms_thread.c:225: undefined reference to `__sync_fetch_and_add_4′ clients/ms_thread.o:/download/libmemcached-0.38/clients/ms_thread.c:208: more undefined references to `__sync_fetch_and_add_4′ follow collect2: ld returned 1 exit status make[2]: *** [clients/memslap] Error 1

解决方案如下：

./configure –with-memcached=/app/memcached/bin/memcached –disable-64bit CFLAGS=”-O3 -march=i686″