Symbol looked up error: Undefined symbol

Question

I'm trying to use libssh with C++ wrapper libsshpp.hpp ( It's wrapped from libssh.h, the libssh libraries written in C). At first I try to buld code from libsshpp.cpp in examples directory g++ -o sshpp libsshpp.cpp -lssh

#include <iostream>
#include <string>
#include <libssh/libsshpp.hpp>

int main(int argc, const char **argv){
  ssh::Session session;
  try {
    if(argc>1)
      session.setOption(SSH_OPTIONS_HOST,argv[1]);
    else
      session.setOption(SSH_OPTIONS_HOST,"localhost");
    session.connect();
    session.userauthPublickeyAuto();
    session.disconnect();
  } catch (ssh::SshException e){
    std::cout << "Error during connection : ";
    std::cout << e.getError() << std::endl;
  }
  return 0;
}

build is success but when excute sshpp, it shows error: ./sshpp: symbol lookup error: ./sshpp: undefined symbol: ssh_userauth_publickey_auto.

I look up in libsshpp.cpp:

  int userauthPublickeyAuto(void){
    int ret=ssh_userauth_publickey_auto(c_session, NULL, NULL);
    ssh_throw(ret);
    return ret;
  }

and in libssh.h:

LIBSSH_API int ssh_userauth_publickey_auto(ssh_session session,
                                           const char *username,
                                           const char *passphrase);

Hope anyone experienced with libssh can help

You are calling it as a method of class ssh::Session. Is that how it is defined? — stark, Apr 04 '14 at 21:52
yep, you can find here http://api.libssh.org/master/libsshpp_8hpp_source.html — Nhan Ly, Apr 04 '14 at 22:07
If libssh isn't installed in the usual place, you may need to update your `LD_LIBRARY_PATH`? — cklin, Apr 04 '14 at 22:12

score 0 · Answer 1 · answered Apr 05 '14 at 02:41

0

"symbol lookup error" means the executable is looking for the object code for that method and cannot find it.

Try this: g++ -o sshpp libsshpp.cpp -L<"path to libssh"> -lssh

answered Apr 05 '14 at 02:41

bluesky

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Symbol looked up error: Undefined symbol

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