记录 CMakeLists.txt 常见错误处理方法

?1. espace boost::placeholders

警告信息：
espace boost::placeholders, or define BOOST_BIND_GLOBAL_PLACEHOLDERS to retain the current behavior.’
   36 | BOOST_PRAGMA_MESSAGE(
      | ^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/boost/smart_ptr/detail/sp_thread_sleep.hpp:22,
                 from /usr/include/boost/smart_ptr/detail/yield_k.hpp:23,
                 from /usr/include/boost/smart_ptr/detail/spinlock_gcc_atomic.hpp:14,
                 from /usr/include/boost/smart_ptr/detail/spinlock.hpp:42,
                 from /usr/include/boost/smart_ptr/detail/spinlock_pool.hpp:25,
                 from /usr/include/boost/smart_ptr/shared_ptr.hpp:29,
                 from /usr/include/boost/shared_ptr.hpp:17,
解决方法：
在 CMakeLists.txt 中添加 add_definitions(-DBOOST_BIND_GLOBAL_PLACEHOLDERS)