Boost.Regex linkage error LUbuntu 14.04 g++ 4.8.2

Question

Good morning!

I have problem with regular expressions in C++11. I have Ubuntu Light 14.04 and this version of compiler:

g++ (Ubuntu 4.8.2-19ubuntu1) 4.8.2
Copyright (C) 2013 Free Software Foundation, Inc.

I installed boost today using this three commands.

sudo apt-get install libboost-all-dev
sudo apt-get install aptitude
aptitude search boost

When i compile this simple program:

#include <iostream>
#include <string>
#include <boost/regex.hpp>
using namespace boost;
using namespace std;
int main()
{
    string text;
    regex pattern( "\\w* to \\w*" );
    return 0;
}

using this command:

g++ main.cpp

compiler returns:

/tmp/ccOdFz7f.o: In function `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)':
main.cpp:(.text._ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j[_ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j]+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)'
collect2: error: ld returned 1 exit status

I read this topic: linker error in boost regex and used this command:

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

but compiler returns:

/usr/bin/ld: cannot find -lboost_regex-mt
collect2: error: ld returned 1 exit status

I also don't have /usr/lib/boost directory!!!

What should i change in this program or do in Ubuntu to use regular expressions from boost?

score 1 · Accepted Answer · answered Oct 10 '14 at 22:14

The linker cannot find the specified file. Use -lboost_regex to link the library.

To locate the installed regex library, invoke locate libboost_regex, like this:

$ locate libboost_regex
/usr/lib/x86_64-linux-gnu/libboost_regex.a
/usr/lib/x86_64-linux-gnu/libboost_regex.so
/usr/lib/x86_64-linux-gnu/libboost_regex.so.1.54.0

In my case it is installed into /usr/lib/x86_64-linux-gnu directory

Boost.Regex linkage error LUbuntu 14.04 g++ 4.8.2

1 Answers1