Re: [RFC] Support exec tracing on GNU/Linux and HP-UX

[Daniel Jacobowitz <drow@false.org>]

On Sun, Oct 21, 2007 at 09:38:31PM -0700, Joel Brobecker wrote:
> I have tested this patch, and it unfortunately creates some issues:
> 
>    (gdb) run
>    Starting program: /[...]/p 
>    Executing new program: /usr/local/bin/zsh
>    (no debugging symbols found)
>    Unable to find __dld_flags symbol in object file.
> 
> What seems to happen is that we're enabling exec-following during
> the startup sequence, and that causes us to do the follow-exec routine
> on it. Eventually, this fails because the shell binary that I use
> apparently does not have any symbols, thus causing the solib-som hook
> to error out.
> 
> Do we do the same on Linux? (exec-follow during the startup)

No, we don't.  We don't turn on the exec tracing option until
linux_child_post_startup_inferior, and by then the shell has
already execed.  But inf-ttrace.c turns on exec tracing in
inf_ttrace_him instead.

This must be related to the code in infrun.c:1454 and its comment
about how HP-UX is probably broken.  It's not quite the same
though since inferior_ignoring_leading_exec_events is supposed to
handle execs which are reported twice.

-- 
Daniel Jacobowitz
CodeSourcery