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 #70 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 22:06:12 +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 20:56:38 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> From: Andreas Schwab <schwab <at> suse.de>
> >> EMACS_INT high_ino = s.st_ino >> 31 >> 1;
> >
> > Thanks.  Can we be reasonably sure that GCC will not become smart
> > enough some day to flag this as well?
> 
> What do you mean with "smart enough"?

Maybe that was a polite way of saying "silly enough".

> There is nothing to flag here.

I meant the warning about shifting by too many bits.  31+1 = 32, and
even a compiler can realize that.

Please don't get me wrong: I will gladly make the change as you
suggested, I just don't want us to bump into this again a few GCC
upgrades down the road.
This bug report was last modified 16 years and 316 days ago.

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