c++ - 让 Boost asio 工作

Question

我正在尝试将 Boost asio 库用于套接字。

我使用自制软件安装了 boost brew install boost

构建后我尝试了 the tutorial用于在 boost 的网站上创建服务器。

我所做的只是将该代码粘贴到名为 main.cc 的文件中

当我尝试编译 g++ main.cc 时出现此错误:

Undefined symbols for architecture x86_64:
"boost::system::system_category()", referenced from:
  __static_initialization_and_destruction_0(int, int)in ccTbzxpk.o
  boost::asio::error::get_system_category()    in ccTbzxpk.o
  boost::system::error_code::error_code()in ccTbzxpk.o
"boost::system::generic_category()", referenced from:
  __static_initialization_and_destruction_0(int, int)in ccTbzxpk.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

出了什么问题？

Answer 1

那些是链接器错误。如果您阅读 docs :

The following libraries must be available in order to link programs that use Boost.Asio:

Boost.System for the boost::system::error_code and boost::system::system_error classes. Boost.Regex (optional) if you use any of the read_until() or async_read_until() overloads that take a boost::regex parameter. OpenSSL (optional) if you use Boost.Asio's SSL support.

Furthermore, some of the examples also require the Boost.Thread, Boost.Date_Time or Boost.Serialization libraries.

现在，你发布的错误都说:boost::system，这意味着你需要像这样链接(假设一切都是默认的):g++ main.cc -lboost_system

请阅读What do 'statically linked' and 'dynamically linked' mean?有关链接的深入信息。