CODEWITHSUNDEEP
boostlinkercentos
Columbo
Columbo

Reputation: 2936

Boost/CentOS linking issue

I'm trying to learn Boost threading. I'm using code from a tutorial online, after some errors I realised that I needed a newer version of Boost so I downloaded the latest version of it into a directory, unzipped it and installed it with the commands:

./bootstrap.sh
./bjam install

The sample code I'm trying to run is this:

#include <boost/thread.hpp> 
#include <iostream> 

using namespace std;
using namespace boost;

void threader()
{ 
  for (int i = 0; i < 5; ++i)
  { 
    sleep(1); 
    cout << boost::this_thread::get_id() << "-" << i << endl;
    //cout << "-" << i << endl;
  } 
} 
int main() 
{ 
  thread t(threader);
  sleep(1);
  thread u(threader);
  t.join(); 
  u.join(); 
}

I compiled with the same line I used with the old version of Boost(1.33 as comes with Centos as standard):

g++ -Wall -L/usr/local/lib -lboost_thread threadtest.cpp -o threadtest

It compiled without error (unlike with the old version of Boost) but when I run threadtest I get:

./threadtest: error while loading shared libraries: libboost_thread.so.1.47.0: cannot open shared object file: No such file or directory

Looking into the /usr/local/lib dircetory I can see the following:

-rw-r--r-- 1 root root   217270 Nov 10 12:50 libboost_thread.a
lrwxrwxrwx 1 root root       25 Nov 10 12:43 libboost_thread.so -> libboost_thread.so.1.47.0
-rwxr-xr-x 1 root root   138719 Nov 10 12:43 libboost_thread.so.1.47.0

So I cannot see why it's not working. I think it's to do with the -lboost_thread part of the compilation line. I tried linking to the library directly with:

g++ -Wall -L/usr/local/lib libboost_thread.a threadtest.cpp -o threadtest

But it again can't find the file. Can anyone help with this?

Upvotes: 2

Views: 1338

Answers (1)

Columbo
Columbo

Reputation: 2936

I needed to re-add the path of my lib directory to my LD_LIBRARY_PATH with the following:

export LD_LIBRARY_PATH="/usr/local/lib/"

That did the trick.

Upvotes: 2

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