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bug#766: 23.0.60; interesting warning during compilation
From: |
Eli Zaretskii |
Subject: |
bug#766: 23.0.60; interesting warning during compilation |
Date: |
Sun, 24 Aug 2008 21:12:02 +0300 |
> Cc: 766@emacsbugs.donarmstrong.com,
> bug-gnu-emacs@gnu.org
> From: Peter Dyballa <Peter_Dyballa@Freenet.DE>
> Date: Sun, 24 Aug 2008 09:27:16 +0200
>
>
> Am 24.08.2008 um 05:13 schrieb Eli Zaretskii:
>
> > If you mean with sizeof, then the problem is that sizeof is not a
> > preprocessing-time operator, so it cannot prevent the compiler from
> > seeing the offending code.
>
> You mean
>
> if (sizeof (s.st_ino) > 4)
>
> introducing the shift operation will fail to keep the compiler from
> emitting the warning?
Yes, it will fail. Please try compiling this toy program on a 32-bit
machine, and you will see the same warning.
int foo (int a)
{
if (sizeof (a) > 4)
return a >> 32;
else
return 0;
}
> Anyway, I think Andreas Schwab's proposition to split the one wide
> shift into two shorter ones is better.
I agree, I just wanted to be sure that this won't bring the same
warning back at some future time.
bug#766: 23.0.60; interesting warning during compilation, Andreas Schwab, 2008/08/23
- bug#766: 23.0.60; interesting warning during compilation, Eli Zaretskii, 2008/08/23
- bug#766: 23.0.60; interesting warning during compilation, Andreas Schwab, 2008/08/23
- bug#766: 23.0.60; interesting warning during compilation, Eli Zaretskii, 2008/08/23
- bug#766: 23.0.60; interesting warning during compilation, Andreas Schwab, 2008/08/23
- bug#766: 23.0.60; interesting warning during compilation, Eli Zaretskii, 2008/08/23
- bug#766: 23.0.60; interesting warning during compilation, Andreas Schwab, 2008/08/23
- bug#766: 23.0.60; interesting warning during compilation, Eli Zaretskii, 2008/08/23
bug#766: marked as done (23.0.60; interesting warning during compilation), Emacs bug Tracking System, 2008/08/27