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- What is an undefined reference/unresolved external symbol error and how do I fix it? 33 answers
I'm trying to learn the boost library and I'm having trouble even compiling a simple program from their official tutorials.
Ubuntu 16.04LTS, installed boost via:
sudo apt-get install libboost-all-dev
test.cpp:
#include <iostream>
#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
int main()
{
boost::asio::io_service io;
boost::asio::deadline_timer t(io, boost::posix_time::seconds(5));
t.wait();
std::cout << "Hello, world!" << std::endl;
return 0;
}
compile command:
g++ -l boost_system test.cpp
/tmp/ccFqTvqW.o: In function `__static_initialization_and_destruction_0(int, int)':
test.cpp:(.text+0x11f): undefined reference to `boost::system::generic_category()'
test.cpp:(.text+0x12b): undefined reference to `boost::system::generic_category()'
test.cpp:(.text+0x137): undefined reference to `boost::system::system_category()'
/tmp/ccFqTvqW.o: In function `boost::system::error_code::error_code()':
test.cpp:(.text._ZN5boost6system10error_codeC2Ev[_ZN5boost6system10error_codeC5Ev]+0x17): undefined reference to `boost::system::system_category()'
/tmp/ccFqTvqW.o: In function `boost::asio::error::get_system_category()':
test.cpp:(.text._ZN5boost4asio5error19get_system_categoryEv[_ZN5boost4asio5error19get_system_categoryEv]+0x5): undefined reference to `boost::system::system_category()'
collect2: error: ld returned 1 exit status
