GNU bug report logs - #766
23.0.60; interesting warning during compilation

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Package: emacs;

Reported by: Peter Dyballa <Peter_Dyballa <at> Freenet.DE>

Date: Sat, 23 Aug 2008 09:05:11 UTC

Severity: normal

Done: Chong Yidong <cyd <at> stupidchicken.com>

Bug is archived. No further changes may be made.

Full log

Message #90 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Andreas Schwab <schwab <at> suse.de>
Cc: 766 <at> debbugs.gnu.org, Peter_Dyballa <at> Freenet.DE,
        bug-gnu-emacs <at> gnu.org
Subject: Re: bug#766: 23.0.60; interesting warning during compilation
Date: Sat, 23 Aug 2008 23:50:18 +0300

> From: Andreas Schwab <schwab <at> suse.de>
> Cc: 766 <at> emacsbugs.donarmstrong.com, Peter_Dyballa <at> Freenet.DE,
> 	bug-gnu-emacs <at> gnu.org
> Date: Sat, 23 Aug 2008 22:03:31 +0200
> 
> Eli Zaretskii <eliz <at> 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.
This bug report was last modified 16 years and 320 days ago.

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