Re: Fwd: Thread Debugging - NPTL/PPC

Daniel Jacobowitz
2005-11-06T23:18:19Z

On Sun, Nov 06, 2005 at 05:51:30PM -0500, B Mullins wrote:
> Thank you!
>
> > (B) What symbols does libthread_db try to look up (by calling
> > ps_pglobal_lookup), and which ones fail? Some failing is OK. All
> > failing is not OK. A stripped libpthread.so won't work for NPTL
> > debugging; it needs the .symtab symbol table, although it doesn't need
> > debug information.
> >
>
> My libpthread was stripped, but I had the debug symbols stored in a
> separate file. In some cases the debug symbols were being found, in
> other cases they were not being found. I was able to use 'set
> debug-file-directory' to direct gdb to the debug symbols, as well as I
> was able to move the symbols to a suitable location for gdb to find
> them by its lonesome.
>
> I kept thinking that I didn't have stripped libs because of the case
> where gdb was working as usual. It just happened, in that case, gdb
> was able to find the debug symbols.

Thanks for closing the loop. I've been thinking about ways to make
this failure mode more obvious; all too many people have trouble
getting it to work.

--
Daniel Jacobowitz
CodeSourcery, LLC