Question

我是Boost C ++库的新手，我试图运行这个利用线程的简单程序

    #include <boost/thread.hpp>
    #include <iostream>
    using namespace std;

    void wait(int seconds)
    {
        boost::this_thread::sleep(boost::posix_time::seconds(seconds));
    }

    void threadAction()
    {
        int i;
        for(i=0;i<5;i++)
        {
            wait(1);
            cout << i << endl;
        }
    }

    int main()
    {
        boost::thread myThread(threadAction);
        myThread.join();
    }

然而，当我试图编译它时，终端向我吐了回来：

   Undefined symbols for architecture x86_64:
      "boost::this_thread::hiden::sleep_until(timespec const&)", referenced from:
          boost::this_thread::sleep(boost::posix_time::ptime const&) in simpleThreadExample-b4b0cd.o
      "boost::detail::thread_data_base::~thread_data_base()", referenced from:
          boost::detail::thread_data<void (*)()>::~thread_data() in simpleThreadExample-b4b0cd.o
      "boost::system::system_category()", referenced from:
          ___cxx_global_var_init2 in simpleThreadExample-b4b0cd.o
          boost::thread_exception::thread_exception(int, char const*) in simpleThreadExample-b4b0cd.o
      "boost::system::generic_category()", referenced from:
          ___cxx_global_var_init in simpleThreadExample-b4b0cd.o
          ___cxx_global_var_init1 in simpleThreadExample-b4b0cd.o
      "boost::thread::join_noexcept()", referenced from:
          boost::thread::join() in simpleThreadExample-b4b0cd.o
      "boost::thread::native_handle()", referenced from:
          boost::thread::get_id() const in simpleThreadExample-b4b0cd.o
      "boost::thread::start_thread_noexcept()", referenced from:
          boost::thread::start_thread() in simpleThreadExample-b4b0cd.o
      "boost::thread::detach()", referenced from:
          boost::thread::~thread() in simpleThreadExample-b4b0cd.o
      "typeinfo for boost::detail::thread_data_base", referenced from:
          typeinfo for boost::detail::thread_data<void (*)()> in simpleThreadExample-b4b0cd.o
      "vtable for boost::detail::thread_data_base", referenced from:
          boost::detail::thread_data_base::thread_data_base() in simpleThreadExample-b4b0cd.o
      NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
    ld: symbol(s) not found for architecture x86_64
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

我不知道为什么。

如果有帮助，我在我的

中安装了库

   /usr/local directory

并使用

  g++ -std=c++11 -I /usr/local/boost_1_57_0 main.cpp

编译我的程序

这可能是一件非常简单而且很小的事情（比如我忘了一个头文件），我只是忽略了，但我似乎无法找到它。如果有人有任何见解，那将是辉煌的！谢谢！

Answer 1

作为快速修复，您可以明确提供所需的Boost组件。在您的情况下，请在CMakeLists.txt文件中使用以下内容：

FIND_PACKAGE（需要提升COMPONENTS线程）

Answer 2

尝试使用：-lboost_thread-mt，在我的情况下运行正常。

例如：

g++ -O3 -stdlib=libc++ -std=c++11 -lboost_thread-mt < File-name >.cpp -o < Binary-Name >

带有C ++ Boost线程的体系结构x86_64的未定义符号

2 个答案: