[英]C++ / Boost: Undefined Symbols in example?
我嘗試編譯的示例來自: http://www.boost.org/doc/libs/1_46_1/doc/html/boost_asio/examples.html (聊天示例)
這是我用來制作它的東西:
>>> g++ chat_client.cpp chat_message.hpp
>>> g++ chat_server.cpp chat_message.hpp
這是終端輸出的內容:
% g++ chat_client.cpp chat_message.hpp
In file included from chat_client.cpp:17:
chat_message.hpp: In member function ‘void chat_message::encode_header()’:
chat_message.hpp:84: warning: format ‘%4d’ expects type ‘int’, but argument 3 has type ‘size_t’
ld: warning: in chat_message.hpp, file was built for unsupported file format which is not the architecture being linked (x86_64)
Undefined symbols:
"boost::system::generic_category()", referenced from:
__static_initialization_and_destruction_0(int, int)in cctJA2c1.o
__static_initialization_and_destruction_0(int, int)in cctJA2c1.o
"boost::thread::start_thread()", referenced from:
boost::thread::thread<boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > > >(boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > >, boost::disable_if<boost::is_convertible<boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > >&, boost::detail::thread_move_t<boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > > > >, boost::thread::dummy*>::type)in cctJA2c1.o
"boost::thread::join()", referenced from:
_main in cctJA2c1.o
"typeinfo for boost::detail::thread_data_base", referenced from:
typeinfo for boost::detail::thread_data<boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > > >in cctJA2c1.o
"vtable for boost::detail::thread_data_base", referenced from:
boost::detail::thread_data_base::thread_data_base()in cctJA2c1.o
"boost::thread::~thread()", referenced from:
_main in cctJA2c1.o
_main in cctJA2c1.o
"boost::detail::thread_data_base::~thread_data_base()", referenced from:
boost::detail::thread_data<boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > > >::~thread_data()in cctJA2c1.o
boost::detail::thread_data<boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > > >::~thread_data()in cctJA2c1.o
"boost::system::system_category()", referenced from:
boost::system::get_system_category() in cctJA2c1.o
boost::system::error_code::error_code()in cctJA2c1.o
__static_initialization_and_destruction_0(int, int)in cctJA2c1.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
更新:這是我正在使用的當前命令:
% g++ chat_client.cpp chat_message.hpp -lboost_asio -lboost_thread -o client -L/opt/local/lib/
說找不到 -lboost_asio
我查看了 opt/local/lib (安裝了 boost),我沒有看到任何 libboost_asio.so 或類似的東西=\
您需要提供 g++ 升壓庫以與 usins -l 選項鏈接。 我快速瀏覽了這個示例,並猜測您肯定需要thread
庫。 您可以使用它與它鏈接
g++ source.cpp -o executable -lboost_thread
您也可能需要使用 boost_system 庫
g++ source.cpp -o executable -lboost_thread -lboost_system
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