RE: Helping GDB to find symbols

[Daniel Berlin <dan at www dot cgsoftware dot com>]

On Tue, 1 May 2001, Jacques-Olivier Goussard wrote:

>
>
> > From: Eli Zaretskii [mailto:eliz@is.elta.co.il]
> > On Mon, 30 Apr 2001, Jacques-Olivier Goussard wrote:
> >
> > > > Doesn't it work to say "gdb yourprog core", where `yourprog' is the
> > > > unstripped binary and `core' is the core file you get from your
> > > > customers?
> > > No. I guess it gets mixed up in the addresses and offsets. The
> > stacktrace
> > > for example is quite different when I switched to the non-debug to
> > > debug binaries (exec and dynamic libraries).
> >
> > Hmm?  I don't understand how is this possible: all the addresses in a
> > stripped program should be exactly like in an unstripped one.
> > Otherwise, you won't be able to debug the core dump which originated
> > from an unstripped program.
> >
> > Am I missing something?
> >
> > What is your object file format and debug info format, btw?
>
> I do not think the addresses are the same in stripped and unstripped: just
> run
> nm on the same library for debug and non-debug build and you'll see the
> symbols are not at the same address.

This is incorrect.
In fact, it's a law in gcc that using -g shouldn't change the code
generation.  They won't accept patches that violate this.

So the symbol addresses are the same.

If they aren't for you, you must be compiling the non-debug build with
optimization, and the debug build without optimization, or something of
the sort.

gdb ./debug-file core should work fine, even if the core is generated
from the non-debug versio.

I do it all the tie.

--Dan