[Boost-users] Fwd: Getting ASIO application to link (undefined reference to `boost::system::generic_category()) (SOLVED)

Subject: [Boost-users] Fwd: Getting ASIO application to link (undefined reference to `boost::system::generic_category()) (SOLVED)
From: Ulf Samuelsson (boost-user_at_[hidden])
Date: 2013-09-17 13:20:54

Solved!
The Libraries need to be at the end during the link phase.

$ g++ -c -I/usr/include -Iinclude -std=c++0x -o udp_echo_client.o 
udp_echo_client.cpp
$ g++ -o udp_echo_client udp_echo_client.o -L/usr/lib -lboost_filesystem 
-lboost_system -lpthread

works

BR
Ulf

-------- Original Message --------
Subject: 	Getting ASIO application to link (undefined reference to 
`boost::system::generic_category())
Date: 	Tue, 17 Sep 2013 16:58:55 +0200
From: 	Ulf Samuelsson <boost-user_at_[hidden]>
To: 	boost-users_at_[hidden]

     Hi,
Trying to get an ASIO example (udp_echo_client) to build on an Ubuntu
12.04 machine.
It looks like both 1.46 and 1.48 can be installed. (I have installed 1.48).

The libboost*.so all are linked vs 1.48,
and the /usr/include/boost/version.hpp contains
#define BOOST_LIB_VERSION "1_48"
so I think that there should not be a version mismatch,

I can build some really simple examples but,
as soon as I add "asio" with the statement below, the build fails.

using boost::asio::ip::udp;

Fiirst problem is that `boost::system::generic_category()' is missing.

When I grep the libboost libraries, they are only found in
"libboost_[file]system[-mt].so"
but these files are included in the link.

Searching on Internet, also tells me to link with those libraries, which
is not a help.

Tried with "-mt" version as well.

Added
#include <boost/system/error_code.hpp>
#include <boost/system/linux_error.hpp>
without any change.

What is going on?
Running out of ideas...

Thanks for any advice.

/Ulf Samuelsson

----------------------------------------------------------
g++    -I/usr/include -Iinclude  -L/usr/lib -lboost_filesystem
-lboost_system -lpthread -std=c++0x    -o udp_echo_client
udp_echo_client.cpp

/tmp/ccu20iRA.o: In function
`__static_initialization_and_destruction_0(int, int)':
udp_echo_client.cpp:(.text+0x58d): undefined reference to
`boost::system::generic_category()'
udp_echo_client.cpp:(.text+0x597): undefined reference to
`boost::system::generic_category()'
udp_echo_client.cpp:(.text+0x5a1): undefined reference to
`boost::system::system_category()'
/tmp/ccu20iRA.o: In function `boost::system::error_code::error_code()':
udp_echo_client.cpp:(.text._ZN5boost6system10error_codeC2Ev[_ZN5boost6system10error_codeC5Ev]+0x10):
undefined reference to `boost::system::system_category()'
/tmp/ccu20iRA.o: In function `boost::asio::error::get_system_category()':
udp_echo_client.cpp:(.text._ZN5boost4asio5error19get_system_categoryEv[boost::asio::error::get_system_category()]+0x7):
undefined reference to `boost::system::system_category()'
/tmp/ccu20iRA.o: In function
`boost::asio::detail::posix_tss_ptr_create(unsigned int&)':
udp_echo_client.cpp:(.text._ZN5boost4asio6detail20posix_tss_ptr_createERj[boost::asio::detail::posix_tss_ptr_create(unsigned
int&)]+0x15): undefined reference to `pthread_key_create'
/tmp/ccu20iRA.o: In function
`boost::asio::detail::posix_thread::~posix_thread()':
udp_echo_client.cpp:(.text._ZN5boost4asio6detail12posix_threadD2Ev[_ZN5boost4asio6detail12posix_threadD5Ev]+0x1d):
undefined reference to `pthread_detach'
/tmp/ccu20iRA.o: In function `boost::asio::detail::posix_thread::join()':
udp_echo_client.cpp:(.text._ZN5boost4asio6detail12posix_thread4joinEv[boost::asio::detail::posix_thread::join()]+0x25):
undefined reference to `pthread_join'
/tmp/ccu20iRA.o: In function
`boost::asio::detail::posix_thread::start_thread(boost::asio::detail::posix_thread::func_base*)':
udp_echo_client.cpp:(.text._ZN5boost4asio6detail12posix_thread12start_threadEPNS2_9func_baseE[boost::asio::detail::posix_thread::start_thread(boost::asio::detail::posix_thread::func_base*)]+0x24):
undefined reference to `pthread_create'
/tmp/ccu20iRA.o: In function
`boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service,
boost::asio::detail::task_io_service::thread_info>::context>::~posix_tss_ptr()':
udp_echo_client.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceENS4_11thread_infoEE7contextEED2Ev[_ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceENS4_11thread_infoEE7contextEED5Ev]+0xf):
undefined reference to `pthread_key_delete'
/tmp/ccu20iRA.o: In function
`boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service,
boost::asio::detail::task_io_service::thread_info>::context>::operator
boost::asio::detail::call_stack<boost::asio::detail::task_io_service,
boost::asio::detail::task_io_service::thread_info>::context*() const':
udp_echo_client.cpp:(.text._ZNK5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceENS4_11thread_infoEE7contextEEcvPS7_Ev[boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service,
boost::asio::detail::task_io_service::thread_info>::context>::operator
boost::asio::detail::call_stack<boost::asio::detail::task_io_service,
boost::asio::detail::task_io_service::thread_info>::context*()
const]+0xf): undefined reference to `pthread_getspecific'
/tmp/ccu20iRA.o: In function
`boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::strand_service::strand_impl,
unsigned char>::context>::~posix_tss_ptr()':
udp_echo_client.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_14strand_service11strand_implEhE7contextEED2Ev[_ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_14strand_service11strand_implEhE7contextEED5Ev]+0xf):
undefined reference to `pthread_key_delete'
/tmp/ccu20iRA.o: In function
`boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service,
boost::asio::detail::task_io_service::thread_info>::context>::operator=(boost::asio::detail::call_stack<boost::asio::detail::task_io_service,
boost::asio::detail::task_io_service::thread_info>::context*)':
udp_echo_client.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceENS4_11thread_infoEE7contextEEaSEPS7_[boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service,
boost::asio::detail::task_io_service::thread_info>::context>::operator=(boost::asio::detail::call_stack<boost::asio::detail::task_io_service,
boost::asio::detail::task_io_service::thread_info>::context*)]+0x16):
undefined reference to `pthread_setspecific'
collect2: ld returnerade avslutningsstatus 1
make: *** [udp_echo_client] Fel 1
--------------------------------------------------------------

Makefile:
------------------------------------------------------
# Using 1.48.0 in Ubuntu 12.04

BOOST=/usr
INCLUDES += -I$(BOOST)/include -Iinclude
LIBS +=-L$(BOOST)/lib -lboost_filesystem -lboost_system -lpthread
CFLAGS=$(INCLUDES) $(LIBS) -std=c++0x

all:    udp_echo_client

udp_echo_client:    udp_echo_client.cpp
     g++    $(CFLAGS)    -o $@ udp_echo_client.cpp

clean:
     rm    -f    udp_echo_client
     rm    -f    *~

--------------------------------------------------------

Code from example:
--------------------------------------------------------
//
// blocking_udp_echo_client.cpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff
dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See
accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#include <cstdlib>
#include <cstring>
#include <iostream>
#include <boost/asio.hpp>

using boost::asio::ip::udp;

enum { max_length = 1024 };

int main(int argc, char* argv[])
{
   try
   {
     if (argc != 3)
     {
       std::cerr << "Usage: blocking_udp_echo_client <host> <port>\n";
       return 1;
     }

     boost::asio::io_service io_service;

     udp::socket s(io_service, udp::endpoint(udp::v4(), 0));

     udp::resolver resolver(io_service);

     udp::endpoint endpoint = *resolver.resolve({udp::v4(), argv[1],
argv[2]});

     std::cout << "Enter message: ";
     char request[max_length];
     std::cin.getline(request, max_length);
     size_t request_length = std::strlen(request);
     s.send_to(boost::asio::buffer(request, request_length), endpoint);

     char reply[max_length];
     udp::endpoint sender_endpoint;
     size_t reply_length = s.receive_from(
         boost::asio::buffer(reply, max_length), sender_endpoint);
     std::cout << "Reply is: ";
     std::cout.write(reply, reply_length);
     std::cout << "\n";
   }
   catch (std::exception& e)
   {
     std::cerr << "Exception: " << e.what() << "\n";
   }

   return 0;
}