$ 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 --------
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;
}