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undefined symbol: __sync_bool_compare_and_swap_4

运行swoole程序时出现此错误，说明操作系统gcc版本过低，请升级gcc至4.4以上版本。

/usr/local/php56/bin/php: symbol lookup error: /usr/local/php56/lib/php/extensions/no-debug-non-zts-20131226/swoole.so: undefined symbol: __sync_bool_compare_and_swap_4

然后重新编译安装swoole

phpize
./configure
make clean
make install