c++ -/usr/include/boost/filesystem/path.hpp:307: 未定义对`boost::filesystem::path::operator 的引用

Question

我有一些代码，当我编译它时，出现以下错误，我不知道如何解决。我尝试添加 -L/usr/lib/x86_64-linux-gnu、-lboost_system 和 -lboost_filesystem，但我仍然得到同样的错误。我现在不知道如何解决这个问题，是否有人可以提供帮助？

Agent.o: In function `boost::filesystem::path::append(char const*, std::codecvt<wchar_t, char, __mbstate_t> const&)':
/usr/include/boost/filesystem/path.hpp:307: undefined reference to `boost::filesystem::path::operator/=(char const*)'
Agent.o: In function `boost::filesystem::exists(boost::filesystem::path const&)':
/usr/include/boost/filesystem/operations.hpp:289: undefined reference to `boost::filesystem::detail::status(boost::filesystem::path const&, boost::system::error_code*)'
Agent.o: In function `boost::filesystem::create_directories(boost::filesystem::path const&)':
/usr/include/boost/filesystem/operations.hpp:399: undefined reference to `boost::filesystem::detail::create_directories(boost::filesystem::path const&, boost::system::error_code*)'
Agent.o: In function `boost::enable_if<boost::filesystem::path_traits::is_pathable<boost::decay<char [256]>::type>, boost::filesystem::path&>::type boost::filesystem::path::operator/=<char [256]>(char const (&) [256])':
/usr/include/boost/filesystem/path.hpp:302: undefined reference to `boost::filesystem::path::codecvt()'
collect2: error: ld returned 1 exit status
make: *** [player] Error 1

相关代码如下

bool Agent::openTupleLog()
{
 std::string dir="~/Experiments/Nov/";
 // create the log directory & file path string


try
{
    boost::filesystem::path kaway_log( dir
#if defined(BOOST_FILESYSTEM_VERSION) && BOOST_FILESYSTEM_VERSION == 2
#  ifndef BOOST_FILESYSTEM_NO_DEPRECATED
                                       , &boost::filesystem::native
#  endif
#endif
                                       );
    if ( ! boost::filesystem::exists( kaway_log )
         && ! boost::filesystem::create_directories( kaway_log ) )
    {
        std::cerr << __FILE__ << ": " << __LINE__
                  << ": can't create log directory '"
                  << kaway_log.BOOST_FS_DIRECTORY_STRING() << "'" << std::endl;
        return false;
    }

    kaway_log /= tuplesFilename;


   M_kaway_log_name = kaway_log.BOOST_FS_FILE_STRING();
}
catch ( std::exception & e )
{
    std::cerr << __FILE__ << ": " << __LINE__
              << " Exception caught! " << e.what()
              << "\nCould not create log directory '"
              << dir
              << "'" << std::endl;
    return false;
}

// open the output file stream
M_kaway_log.open( M_kaway_log_name.c_str() );

if ( ! M_kaway_log.is_open() )
{
    std::cerr << __FILE__ << ": " << __LINE__
              << ": can't open log_file " << M_kaway_log_name
              << std::endl;
    return false;
}

return true;

Answer 1

问题已解决。

我问了一个 friend ，他告诉我在命令末尾添加/usr/lib/x86_64-linux-gnu/libboost_filesystem.a -lboost_filesystem -lboost_system，然后就可以了。他说:

The order of putting those flags are dependent, and thus I have to move the .a to very end. Then it ask for boost_system and thus I appended -lboost_system for its pleasure.

请注意，它是 libboost_filesystem.a，而不是 libboost_filesystem.so