Re: gdb not working with older glibc

[Daniel Jacobowitz <drow@mvista.com>]

On Tue, Nov 11, 2003 at 11:31:56AM -0500, Andrew Cagney wrote:
> >Well that pretty much was the exact output.
> >Here's the version info too:
> >
> >GNU gdb 6.0
> >Copyright 2003 Free Software Foundation, Inc.
> >GDB is free software, covered by the GNU General Public License, and you
> >are
> >welcome to change it and/or distribute copies of it under certain
> >conditions.
> >Type "show copying" to see the conditions.
> >There is absolutely no warranty for GDB.  Type "show warranty" for
> >details.
> >This GDB was configured as "i686-pc-linux-gnu"...
> 
> Sigh.  More recent GDB's print out the libthread_db that was loaded 
> here.  Guess that didn't get into 6.0.

Nope.  (I'm still trying to figure out a way to make the output message
less ugly.  I'm thinking about just sticking a \n in front of it?)

> >(gdb) run
> >Starting program:
> >/path/(name-omitted)
> >
> >Program received signal SIG32, Real-time event 32.
> >0x0811c7f6 in __sigsuspend (set=0xbffff380) at
> >../sysdeps/unix/sysv/linux/sigsuspend.c:45
> >45      ../sysdeps/unix/sysv/linux/sigsuspend.c: No such file or
> >directory.
> >        in ../sysdeps/unix/sysv/linux/sigsuspend.c
> >Current language:  auto; currently c
> >
> >And for gdb 6.0 working, it's just the same thing without the error/crash.
> 
> Anyway, this is the problem:
> 
> >>The problem is most likely that GDB is loading the lated libthread_db
> >>and that library is refusing to debug the older glibc.
> >>
> >>Perhaphs there should be a "set libthread_db ... command?"
> 
> you need to force GDB into loading the correct libthread_db library.  I 
> guess using something like LD_LIBRARY_PATH?  Or perhaphs overriding 
> gdb/thread-db.c:#define LIBTHREAD_DB_SO?

Er, he updated glibc on his system, didn't he?  All of the applications
should be using the same shared linuxthreads object and thus require
the same libthread_db.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer