bug#766: 23.0.60; interesting warning during compilation

[Eli Zaretskii]

> From: Andreas Schwab <schwab@suse.de>
> Cc: 766@emacsbugs.donarmstrong.com, Peter_Dyballa@Freenet.DE,
>       bug-gnu-emacs@gnu.org
> Date: Sat, 23 Aug 2008 22:03:31 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I meant the warning about shifting by too many bits.  31+1 = 32, and
> > even a compiler can realize that.
> 
> That's not how the shift operator is defined.

Andreas, it's late and I'm tired.  Could you please answer my
question, which is: what is the danger, if any, that GCC in some
future version will produce the same warning for the code you
suggested?

Thanks in advance.