链接错误

Question

我想了解一些正则表达式的升压lib和我尝试编译这个简单的例子代码：

// regex_search example 
#include <iostream> 
#include <string> 
#include <boost/regex.hpp> 

int main() 
{ 
    std::string s ("this subject has a submarine as a subsequence"); 
    boost::smatch m; 
    boost::regex e ("\\b(sub)([^ ]*)"); // matches words beginning by "sub" 

    std::cout << "Target sequence: " << s << std::endl; 
    std::cout << "Regular expression: /\\b(sub)([^ ]*)/" << std::endl; 
    std::cout << "The following matches and submatches were found:" << std::endl; 

    while (boost::regex_search (s,m,e)) { 
    for (auto x:m) std::cout << x << " "; 
    std::cout << std::endl; 
    s = m.suffix().str(); 
    } 

    return 0; 
} 

我用：g++ -std=c++0x -I /usr/lib/boost/include -L /usr/lib/boost/lib -lboost_regex test_regex.cpp

但G ++告诉我：

/tmp/ccjni2je.o: In function `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)': 
test_regex.cpp:(.text._ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j[boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)]+0x22): undefined reference to `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign(char const*, char const*, unsigned int)' 
/tmp/ccjni2je.o: In function `bool boost::regex_search<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, char, boost::regex_traits<char, boost::cpp_regex_ 

和更多...

谁能帮助我？

Answer 1

三件事：

1. Boost.Regex库很有可能称为libboost_regex-mt。
2. 除非你知道Boost lib是用C++ 11支持编译的，否则你应该删除
   -std=c++0x选项。
3. 因为GNU ld会按照目标文件和LIBS在命令行中出现的顺序解析符号，所以应始终将LIBS放在最后。

尝试：

 
g++ -I /usr/lib/boost/include -L /usr/lib/boost/lib test_regex.cpp -lboost_regex-mt