Re: [boost] [boost 1.35] Linking problem with GCC 3.2

From: Alexander Dong Back Kim (alexdbkim_at_[hidden])
Date: 2008-09-01 09:51:05

On Mon, Sep 1, 2008 at 4:46 PM, Vladimir Prus <vladimir_at_[hidden]>wrote:

> Alexander Dong Back Kim wrote:
>
> > Hi members,
> >
> > I'm using both GCC 3.2 and 3.4 in different linux machines. The
> application
> > uses a number of BOOST libraries such as program_options, iosterams,
> thread
> > and system. When I compiled the application with GCC 3.4 (of course
> linking
> > correct library files like "libboost_program_options-gcc34-mt"), it
> compiled
> > well and works well. I did "ldd" to see what library files are linked...
> and
> > it says...
> >
> >     libpthread.so.0 => /lib/tls/libpthread.so.0 (0x0048a000)
> >     libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x005e8000)
> >     libm.so.6 => /lib/tls/libm.so.6 (0x00372000)
> >     libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00555000)
> >     libc.so.6 => /lib/tls/libc.so.6 (0x0023e000)
> >     /lib/ld-linux.so.2 (0x00224000)
>
> To be pedantic, the above output has no indication that boost libraries are
> found,
> it only says that the system libraries are found, which is hardly a
> surprise.
>

I found out the problem. I apologize about my silliness that I actually
linked static library (.a) in a machine and tried to link dynamic libraries
(.so) in another machine.

> > Now, I compiled the same application and link different gcc version of
> boost
> > library files because it uses GCC 3.2 instead. I compiled it and there
> was
> > no compile-time error but it cannot be executed because it can't find the
> > target library files. I did "ldd" for the application and now it has all
> the
> > boost library files...
> >
> >     libpthread.so.0 => /lib/tls/libpthread.so.0 (0x0038d000)
> >     libboost_system-gcc32-mt-1_35.so.1.35.0 => not found
> >     libboost_thread-gcc32-mt-1_35.so.1.35.0 => not found
> >     libboost_serialization-gcc32-mt-1_35.so.1.35.0 => not found
> >     libboost_program_options-gcc32-mt-1_35.so.1.35.0 => not found
> >     libboost_iostreams-gcc32-mt-1_35.so.1.35.0 => not found
> >     libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x00b8e000)
> >     libm.so.6 => /lib/tls/libm.so.6 (0x007a6000)
> >     libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00179000)
> >     libc.so.6 => /lib/tls/libc.so.6 (0x00182000)
> >     /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x00d66000)
> >
> > Both machine has the same boost 1.35. Only differences is they have
> > different versions of GCC (3.2 and 3.4). Is there any idea or hints where
> > this problem comes from???
>
> This problem is caused by the fact that there's no file called
> libboost_system-gcc32-mt-1_35.so.1.35.0 neither in standard system
> libraries
> directories (such as /usr/lib) nor in directories in LD_LIBRARY_PATH.
> You have to place the libraries somewhere where they can be found.
> BTW, this issue is not specific to C++ Boost -- it's just regular shared
> linking
> thing on Linux.
>

It seems LD_LIBRARY_PATH  is the right answer for linking the library
dynamically. Thanks for your advice. However, I think I need to use static
libarries since I have to install the application in many other machines
where installing boost is bit hard.

Thanks for your advices. I deeply appreciate your help =)

regards,
Alex Kim