我在网上找的代码，就是编译通不过（用linux下g++ 编译）。帮我看一下，错在哪？
#include <boost/thread/thread.hpp>
#include <iostream>
using namespace std;
void hello()
{
std::cout <<
"Hello world, I'm a thread!"
<< std::endl;
}

int main(int argc, char* argv[])
{
boost::thread thrd(hello);
thrd.join();
return 0;
}

编译器显示的信息如下：
athread.cpp:(.text+0x5f): undefined reference to `boost::thread::join()'
athread.cpp:(.text+0x70): undefined reference to `boost::thread::~thread()'
athread.cpp:(.text+0x92): undefined reference to `boost::thread::~thread()'
/tmp/ccDeh5F3.o: In function `boost::detail::thread_data_base::thread_data_base()':
athread.cpp:(.text._ZN5boost6detail16thread_data_baseC2Ev[_ZN5boost6detail16thread_data_baseC5Ev]+0x24): undefined reference to `vtable for boost::detail::thread_data_base'
/tmp/ccDeh5F3.o: In function `boost::thread::thread<void (*)()>(void (*)(), boost::disable_if<boost::is_convertible<void (*&)(), boost::detail::thread_move_t<void (*)()> >, boost::thread::dummy*>::type)':
athread.cpp:(.text._ZN5boost6threadC2IPFvvEEET_NS_10disable_ifINS_14is_convertibleIRS4_NS_6detail13thread_move_tIS4_EEEEPNS0_5dummyEE4typeE[_ZN5boost6threadC5IPFvvEEET_NS_10disable_ifINS_14is_convertibleIRS4_NS_6detail13thread_move_tIS4_EEEEPNS0_5dummyEE4typeE]+0x40): undefined reference to `boost::thread::start_thread()'
/tmp/ccDeh5F3.o: In function `boost::detail::thread_data<void (*)()>::~thread_data()':
athread.cpp:(.text._ZN5boost6detail11thread_dataIPFvvEED2Ev[_ZN5boost6detail11thread_dataIPFvvEED5Ev]+0x1f): undefined reference to `boost::detail::thread_data_base::~thread_data_base()'
/tmp/ccDeh5F3.o:(.rodata._ZTIN5boost6detail11thread_dataIPFvvEEE[typeinfo for boost::detail::thread_data<void (*)()>]+0x10): undefined reference to `typeinfo for boost::detail::thread_data_base'
collect2: ld 返回 1

你确定安装了 libboost-thread 包（Ubuntu）？

去看这里
http://stackoverflow.com/questions/3584365/boost-thread-error-undefined-reference

没链接库吧。

/usr/lib/libboost_thread.so已经装上了，如何用？

-lboost_thread

wei@wei-Lenovo-G475:~/program$ g++ -lboost_thread athread.cpp
/tmp/ccT9235S.o: In function `main':
athread.cpp:(.text+0x50): undefined reference to `boost::thread::join()'
athread.cpp:(.text+0x61): undefined reference to `boost::thread::~thread()'
athread.cpp:(.text+0x79): undefined reference to `boost::thread::~thread()'
/tmp/ccT9235S.o: In function `boost::detail::thread_data_base::thread_data_base()':
athread.cpp:(.text._ZN5boost6detail16thread_data_baseC2Ev[_ZN5boost6detail16thread_data_baseC5Ev]+0x24): undefined reference to `vtable for boost::detail::thread_data_base'
/tmp/ccT9235S.o: In function `boost::thread::thread<void (*)()>(void (*)(), boost::disable_if<boost::is_convertible<void (*&)(), boost::detail::thread_move_t<void (*)()> >, boost::thread::dummy*>::type)':
athread.cpp:(.text._ZN5boost6threadC2IPFvvEEET_NS_10disable_ifINS_14is_convertibleIRS4_NS_6detail13thread_move_tIS4_EEEEPNS0_5dummyEE4typeE[_ZN5boost6threadC5IPFvvEEET_NS_10disable_ifINS_14is_convertibleIRS4_NS_6detail13thread_move_tIS4_EEEEPNS0_5dummyEE4typeE]+0x30): undefined reference to `boost::thread::start_thread()'
/tmp/ccT9235S.o: In function `boost::detail::thread_data<void (*)()>::~thread_data()':
athread.cpp:(.text._ZN5boost6detail11thread_dataIPFvvEED2Ev[_ZN5boost6detail11thread_dataIPFvvEED5Ev]+0x1f): undefined reference to `boost::detail::thread_data_base::~thread_data_base()'
/tmp/ccT9235S.o:(.rodata._ZTIN5boost6detail11thread_dataIPFvvEEE[typeinfo for boost::detail::thread_data<void (*)()>]+0x10): undefined reference to `typeinfo for boost::detail::thread_data_base'
collect2: ld 返回 1


也不行呀，试好了，再给我发吧。

要装 boost 的 dev，那个 so 是没用的，要 .a 文件

.a .so 不是一样的么？
一个静态 一个动态

dev包提供头文件，倒是需要用到的。

wei@wei-Lenovo-G475:~$ sudo find /usr -name *boost*.a -type f
[sudo] password for wei:
/usr/lib/libboost_serialization.a
/usr/lib/libboost_thread.a
/usr/lib/libboost_date_time.a
/usr/lib/libboost_wserialization.a
wei@wei-Lenovo-G475:~/program$ g++ athread.cpp -o athread /usr/lib/libboost_thread.a
/usr/lib/libboost_thread.a(thread.o): In function `_ZN5boost9call_onceIPFvvEEEvRNS_9once_flagET_.constprop.97':
(.text+0xc8): undefined reference to `pthread_key_create'
/usr/lib/libboost_thread.a(thread.o): In function `boost::this_thread::interruption_enabled()':
(.text+0x540): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::this_thread::disable_interruption::disable_interruption()':
(.text+0x570): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::this_thread::disable_interruption::disable_interruption()':
(.text+0x59f): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::this_thread::disable_interruption::~disable_interruption()':
(.text+0x5c0): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::this_thread::disable_interruption::~disable_interruption()':
(.text+0x5d5): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o):(.text+0x605): more undefined references to `pthread_getspecific' follow
/usr/lib/libboost_thread.a(thread.o): In function `boost::thread::start_thread()':
(.text+0x7a9): undefined reference to `pthread_create'
/usr/lib/libboost_thread.a(thread.o): In function `thread_proxy':
(.text+0x8c6): undefined reference to `pthread_setspecific'
/usr/lib/libboost_thread.a(thread.o): In function `thread_proxy':
(.text+0x8eb): undefined reference to `pthread_setspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::this_thread::interruption_requested()':
(.text+0xa2a): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::thread::detach()':
(.text+0xb9d): undefined reference to `pthread_detach'
/usr/lib/libboost_thread.a(thread.o): In function `boost::(anonymous namespace)::make_external_thread_data()':
(.text+0x124a): undefined reference to `pthread_setspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::detail::add_thread_exit_function(boost::detail::thread_exit_function_base*)':
(.text+0x147d): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::this_thread::get_id()':
(.text+0x14f2): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::this_thread::interruption_point()':
(.text+0x15e1): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::thread::join()':
(.text+0x1731): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::thread::join()':
(.text+0x17e5): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o):(.text+0x1907): more undefined references to `pthread_getspecific' follow
/usr/lib/libboost_thread.a(thread.o): In function `boost::thread::join()':
(.text+0x1bce): undefined reference to `pthread_join'
/usr/lib/libboost_thread.a(thread.o): In function `boost::thread::timed_join(boost::posix_time::ptime const&)':
(.text+0x2256): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::thread::timed_join(boost::posix_time::ptime const&)':
(.text+0x22f3): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::thread::timed_join(boost::posix_time::ptime const&)':
(.text+0x25a7): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::thread::timed_join(boost::posix_time::ptime const&)':
(.text+0x2636): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::thread::timed_join(boost::posix_time::ptime const&)':
(.text+0x2716): undefined reference to `pthread_join'
/usr/lib/libboost_thread.a(thread.o): In function `boost::detail::erase_tss_node(void const*)':
(.text+0x2d55): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::detail::add_new_tss_node(void const*, boost::shared_ptr<boost::detail::tss_cleanup_function>, void*)':
(.text+0x2db0): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::detail::set_tss_data(void const*, boost::shared_ptr<boost::detail::tss_cleanup_function>, void*, bool)':
(.text+0x3054): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::detail::set_tss_data(void const*, boost::shared_ptr<boost::detail::tss_cleanup_function>, void*, bool)':
(.text+0x319a): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::this_thread::sleep(boost::posix_time::ptime const&)':
(.text+0x3230): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o):(.text+0x33bd): more undefined references to `pthread_getspecific' follow
/usr/lib/libboost_thread.a(thread.o): In function `boost::detail::(anonymous namespace)::create_current_thread_tls_key()':
(.text+0x1b): undefined reference to `pthread_key_create'
/usr/lib/libboost_thread.a(thread.o): In function `boost::detail::get_current_thread_data()':
(.text+0x2f4): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(thread.o): In function `boost::detail::set_current_thread_data(boost::detail::thread_data_base*)':
(.text+0x314): undefined reference to `pthread_setspecific'
/usr/lib/libboost_thread.a(once.o): In function `boost::detail::get_once_per_thread_epoch()':
(.text+0x2c): undefined reference to `pthread_once'
/usr/lib/libboost_thread.a(once.o): In function `boost::detail::get_once_per_thread_epoch()':
(.text+0x37): undefined reference to `pthread_getspecific'
/usr/lib/libboost_thread.a(once.o): In function `boost::detail::get_once_per_thread_epoch()':
(.text+0x67): undefined reference to `pthread_setspecific'
/usr/lib/libboost_thread.a(once.o): In function `create_epoch_tss_key':
(.text+0xb): undefined reference to `pthread_key_create'
collect2: ld 返回 1
wei@wei-Lenovo-G475:~/program$
为什么还是不行？

pthread 的 dev

也不行，试好了，再发表意见！

我只能说那四个字母

wei@wei-Lenovo-G475:~/program$ ls /usr/lib/libboost_thread*
/usr/lib/libboost_thread.a /usr/lib/libboost_thread-mt.so /usr/lib/libboost_thread.so.1.46.1
/usr/lib/libboost_thread-mt.a /usr/lib/libboost_thread.so

wei@wei-Lenovo-G475:~/program$ g++ athread.cpp /usr/lib/libboost_thread.so
/usr/bin/ld: 1: libboost-thread1.46.1:: not found
collect2: ld 返回 127
wei@wei-Lenovo-G475:~/program$ g++ athread.cpp -lboost_thread
/usr/bin/ld: 1: libboost-thread1.46.1:: not found
collect2: ld 返回 127
wei@wei-Lenovo-G475:~/program$

wrong!

lz不会照葫芦画瓢看命令？
12不是有命令么

楼主链接boost的thread库，提示pthread的库都没有。然后开始喷那些教他链接boost的楼下。。。嗯，其实是自己准备功课都没做好。。。

ls -la /usr/lib/libboost_thread.so
加上这个看下，可能软链接指的东西都不对。