Re: [patch][rfc] Allow GDB to search for the right libthread_db.so.1

[Paul Pluzhnikov <ppluzhnikov@google.com>]

On Wed, Apr 22, 2009 at 11:21 PM, Hui Zhu <teawater@gmail.com> wrote:

> About your patch, I think let user choice load which libthread_db is
> very cool idea.
> Why not let they set which file they want to load directly?
>
> For example:
> set libthread-db /xxx_dir/libxxx

As I stated at the start of this thread, we have a mixture of
executables: some are linked statically, some dynamically, and
against several (incompatible WRT libthread_db) glibc versions.

I'd like GDB to work "automagically" for all such executables,
without the end user having to understand and specify exactly
which libthread_db must be loaded for each one [1].

The patch allows me to achieve that (all I need to do is provide
appropriate local definition of LIBTHREAD_DB_SEARCH_PATH).

[1] Understanding this requires the user to understand how
GDB uses libthread_db and the relationship between libpthread and
libthread_db. Also, the mapping is complicated by the fact that
64-bit GDB is sometimes used to debug 32-bit inferiors.

Cheers,
-- 
Paul Pluzhnikov