[patch] Warn on constant value watchpoints

[Eli Zaretskii]

> Date: Thu, 26 Jun 2008 10:27:31 -0400
> From: Daniel Jacobowitz <drow@false.org>
> Cc: gdb-patches@sourceware.org
> 
> > +If you watch for a change in a numerically entered address you need to
> > +dereference it as the address itself is just a constant number which will never
> > +change.  @value{GDBN} refuses to create a never invokable watchpoint:
> 
> never-changing?

"a watchpoint that watches a never-changing value"