Re: loading shared library

[Kevin Buettner <kevinb at redhat dot com>]

On Jan 31, 10:55am, Frank van Eijkelenburg wrote:
> Subject: RE: loading shared library
> > -----Original Message-----
> > From: Kevin Buettner [mailto:kevinb@redhat.com]
> > Sent: maandag 27 januari 2003 17:06
> > To: frank.van.eijkelenburg@technolution.nl; Gnu Debugger mailing list
> > Subject: Re: loading shared library
> >
> >
> > On Jan 27, 11:38am, Frank van Eijkelenburg wrote:
> >
> > > I don't understand why gdb tries to load a library from the host
> > > (/lib/libpthread.so.0), while it needs the crosscompiled
> > library from the
> > > target. Or do I misunderstand something?
> >
> > You need to tell GDB where to find the shared libraries for the target.
> > Use the ``set solib-absolute-prefix ...'' command to do this.
> >
> > Kevin
> 
> I tried this, and it was working. At this moment I've upgraded my glibc on
> the target from 2.1.3 to 2.2.4. I also build a complete toolchain with glibc
> 2.2.4. Now I want to debug a simple multithreaded program remote. But the
> following occured:
> 
> GNU gdb 5.3
> Copyright 2002 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 "--host=i686-pc-linux-gnu --target=arm-linux"...
> 0x40002a70 in ?? ()
> (gdb) b 20
> Breakpoint 1 at 0x8590: file ex1.c, line 20.
> (gdb) c
> Continuing.
> 
> Breakpoint 1, main () at ex1.c:26
> 26        retcode = pthread_create(&th_a, NULL, process, (void *) "a");
> (gdb) sharedlibrary
> Reading symbols from /usr/arm/tools/arm-linux/lib/libpthread.so.0...done.
> Ignoring packet error, continuing...
> Loaded symbols for /usr/arm/tools/arm-linux/lib/libpthread.so.0
> Reading symbols from /usr/arm/tools/arm-linux/lib/libc.so.6...done.
> Error while reading shared library symbols:
> putpkt: write failed: Broken pipe.
> Reading symbols from /usr/arm/tools/arm-linux/lib/ld-linux.so.2...done.
> Error while reading shared library symbols:
> putpkt: write failed: Broken pipe.
> putpkt: write failed: Broken pipe.
> (gdb) show solib-absolute-prefix
> Prefix for loading absolute shared library symbol files is "/dev/null".
> (gdb) show solib-
> solib-absolute-prefix  solib-search-path
> (gdb) show solib-search-path
> The search path for loading non-absolute shared library symbol files is
> "/usr/arm/tools/arm-linux/lib".
> (gdb)
> 
> It's trying to load the right libraries, but fails on libpthread (I can load
> the other two without any problems). Any idea of what's causing the
> problem???

Check the following:

1) That libthread_db.so on the target is from the new glibc.

2) That your gdbserver (or rda) is built with the libthread_db.so from
   the new glibc.  (This is kind of a long shot - so long as it's not
   statically linked it probably shouldn't matter.)
   
3) That libpthread.so on target and host (as found in 
   /usr/arm/tools/arm-linux/lib/libpthread.so.0) are the same.

Kevin