Re: gdb and gtk

[Owen Taylor <otaylor redhat com>]

On Thu, 2004-02-05 at 20:12, Chris Hoefler wrote:

> On any given function, I can set watches on some of my variables, but I
> get "not defined in current context" errors for others (they are
> defined, btw). Does anybody know what is going on here? I have my
> program compiled with -g and I even recompiled the gtk library with -g,
> but that doesn't help.

[ this is offtopic for the list, but since its something useful 
  most people  don't know, I'll answer it here anyways ]

Hardware watchpoints in gdb have to be on absolute addresses. If
you say, do:

 (gdb) watch bin->child

then GDB will think you want to watch the expression 'bin->child'
whatever that means as the code continues to execute. As soon
as bin goes out of scope, you get an error.

What you instead to do is:

 (gdb) p &bin->child
 $15 = (GtkWidget **)0x12345678
 (gdb) watch *$15

This gets gdb to watch that location in memory, rather than that
expression.

Regards,
                                                Owen