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Re: libiberty reports: "undefined reference to dlopen"


On Tue, Jul 03, 2001 at 01:48:21PM -0700, H . J . Lu wrote:
> On Tue, Jul 03, 2001 at 04:16:32PM -0400, Jeff W. wrote:
> > I tried compiling a program that depends on libiberty, and I got these
> > messages when compiling:
> > 
> > g++    -I../include  -w  -I/usr/local/dyninst/core/dyninstAPI/h
> > tau_run.cpp -o tau_run -L/usr/local/dyninst/lib/  -ldyninstAPI -liberty
> > -lelf   
> > /usr/lib/libiberty.a(cplus-dem.o): In function `init_demangler':
> > cplus-dem.o(.text+0xae7): undefined reference to `dlopen'
> > cplus-dem.o(.text+0xaf6): undefined reference to `dlerror'
> > cplus-dem.o(.text+0xb1b): undefined reference to `dlsym'
> > cplus-dem.o(.text+0xb2c): undefined reference to `dlerror'
> > collect2: ld returned 1 exit status
> > 
> > I'm on a Debian system.  I had installed the latest stable release of
> > binutils-dev, still got the above messages, so grabbed the newest tarball
> > of it (2.11.something, newer than the debs), and am still getting the same
> > error.  I'm assuming I've just done something retarded as opposed to it
> > being a bug in libiberty.  Does anyone know what might be the
> > problem?  Thanks.
> 
> It looks like Debian uses a strange binutils. As far as I know,

No, actually, it's 2.11.90.0.7.

> those dlxxx functions are only used in my Linux binutils. But in
> my Linux binutils, they shiuld be marked as weak undefined:
> 
> # objdump --sym /usr/lib/libiberty.a | grep " dl"
> 0000000000000000  w      *UND*  0000000000000000 dlopen
> 0000000000000000  w      *UND*  0000000000000000 dlerror
> 0000000000000000  w      *UND*  0000000000000000 dlsym
> 
> so that linker won't complain if they don't exist.

Jeff, what version of Debian are you running, and what binutils?  They
are weak undefined in unstable.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer


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