undefined symbol: __sync_bool_compare_and_swap_4
最后更新于：2022-04-02 06:19:21
# 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
~~~
';