RFC: add ability to "source" Python code

[Eli Zaretskii]

> Date: Wed, 11 Feb 2009 16:14:18 -0500
> From: Daniel Jacobowitz <drow@false.org>
> Cc: tromey@redhat.com, brobecker@adacore.com, bauerman@br.ibm.com,
> 	pedro@codesourcery.com, gdb-patches@sourceware.org
> 
> > Yes, this is called "backward compatibility".  It just could be that
> > one reason why someone configures GDB without Python is that they
> > don't want this incompatible change.
> 
> This argument would prevent us ever adding new commands or changing
> the behavior of a command without adding a configure option for them.

We are not adding a new command, we are modifying behavior of an old
one in a gratuitously incompatible way.

I don't mind adding a new command, because invoking nonexistent
commands generally produces an error.  So chances of breaking existing
scripts are all but non-existent.  But here we are talking about
breaking something that works today without any error message, and
that's another story.