简单线程程序的链接器错误（来自 boost_chrono 的符号丢失）

Posted 2023-02-22

【中文标题】简单线程程序的链接器错误（来自 boost_chrono 的符号丢失）

【英文标题】：Linker error with simple threaded program (symbols from boost_chrono missing)

【发布时间】：2018-03-15 07:36:01

【问题描述】：

我正在学习 boost::timed_mutex

以下代码无法编译：

#include <boost/thread.hpp>
#include <boost/chrono.hpp>
#include <iostream>

void wait(int seconds)

  boost::this_thread::sleep_for(boost::chrono::secondsseconds);


boost::timed_mutex mutex;

void thread1()

  using boost::this_thread::get_id;
  for (int i = 0; i < 5; ++i)
  
    wait(1);
    boost::unique_lock<boost::timed_mutex> lockmutex;
    std::cout << "Thread " << get_id() << ": " << i << std::endl;
    boost::timed_mutex *m = lock.release();
    m->unlock();
  


void thread2()

  using boost::this_thread::get_id;
  for (int i = 0; i < 5; ++i)
  
    wait(1);
    boost::unique_lock<boost::timed_mutex> lockmutex,
      boost::try_to_lock;
    if (lock.owns_lock() || lock.try_lock_for(boost::chrono::seconds1))
    
      std::cout << "Thread " << get_id() << ": " << i << std::endl;
    
  


int main()

  boost::thread t1thread1;
  boost::thread t2thread2;
  t1.join();
  t2.join();

我的编译命令是：

g++ -std=c++11 unique_lock.cpp -o unique_lock -g -lboost_system -lboost_thread-mt -pthread -lboost_timer

错误类似于以下内容：

/bin/ld: /tmp/ccRVKHNh.o: undefined reference to symbol '_ZN5boost6chrono12system_clock3nowEv'
/usr/lib64/libboost_chrono.so.1.53.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

怎么了？

【问题讨论】：

错误是：/bin/ld: /tmp/ccRVKHNh.o: 未定义对符号 '_ZN5boost6chrono12system_clock3nowEv' /usr/lib64/libboost_chrono.so.1.53.0 的引用：添加符号时出错：DSO 缺失命令行 collect2：错误：ld 返回 1 个退出状态

您尝试添加-lboost_chrono 吗？

我忘了-lboost_chrono，现在可以用了~

【参考方案1】：

显然 -lboost_chrono 不见了。

Demo