Re: [Boost-users] help with boost thread compile

From: Justin Findlay (findlay_at_[hidden])
Date: 2004-10-22 18:45:49

On Fri, Oct 22, 2004 at 01:44:44PM -0700, Sara Collins wrote:
> This might be very easy for a lot of you but I've been
> banging my head on the wall.
> 
> I just installed the boost library and tried to run a
> simple test file using boost.thread.mutex
> 
> #include <boost/thread/mutex.hpp>
> 
> int main()
> {
> boost::mutex m;
> }
> 
> I got this compilation error message:
> undefined reference to
> `boost::mutex::mutex[in-charge]()'
> 
> I guess I have to link in the libboost_thread.dll file

Yes, you do, otherwise the linker can't find the definition of your class that
has already been compiled and lives elsewhere.  It's fairly simple on a Unix-like
system.  If you're on that system that uses the .dll naming convention, then I
can't help you much.

Now to build your program, you need to know the where your library is, and
what it is named.  On my machine it is in ~/local/lib and is called
libboost_thread-gcc-mt.so, so for me to compile your program I would do:

$ g++ -L~/local/lib -lboost_thread-gcc-mt program.cpp -o program

Notice that when using the `-l' flag, you drop the `lib' prefix and `.so'
suffix.

> somehow but I don't seem to find a solution how. 
> Perharps I've been searching the wrong places.

This HOWTO has been useful to me.

http://www.tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html

> Please help the newbie. Thanks a lot in advance.

No problem.

Justin