From: Dirk Herrmann <dirk@sallust.ida.ing.tu-bs.de>
Cc: Guile Devel <guile-devel@gnu.org>
Subject: Re: SCM_POSFIXABLE(-1) fails with MSVC++ 6.0
Date: Sat, 24 Aug 2002 09:42:51 +0200 (CEST) [thread overview]
Message-ID: <Pine.GSO.4.05.10208240941200.4796-100000@sallust.ida.ing.tu-bs.de> (raw)
In-Reply-To: <20020823104054.GA27923@sim.no>
On Fri, 23 Aug 2002, Lars J. Aas wrote:
> Lars J. Aas <larsa@sim.no> wrote:
> : Changing the alternative definition of SCM_LONG_BITS to cast the value
> : to long like this works...
> :
> : # define SCM_LONG_BIT ((long)(SCM_CHAR_BIT * sizeof (long) / sizeof (char)))
>
> Come to think of it, the cast is better placed on the inside so it's more
> evident what is being done (stopping the unsigned-ness of the sizeof()-
> operations to propagate incorrectly out through the macro invokation) so
> it's not removed later by someone not knowing about this compiler bug.
>
> # define SCM_LONG_BIT (SCM_CHAR_BIT * ((long) (sizeof (long) / sizeof (char))))
>
> or s/long/int/ on the cast?
>
> BTW, is anyone reading these mails? ;)
>
> Lars J
I am not sure I understand the problem here: is the failure of testing
-1 <= sizeof(long) a compiler bug, or is the strange behaviour defined
in the C language?
Best regards,
Dirk Herrmann
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next prev parent reply other threads:[~2002-08-24 7:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-22 13:30 SCM_POSFIXABLE(-1) fails with MSVC++ 6.0 Lars J. Aas
2002-08-22 13:47 ` Lars J. Aas
2002-08-23 10:40 ` Lars J. Aas
2002-08-24 7:42 ` Dirk Herrmann [this message]
2002-08-24 15:57 ` Lynn Winebarger
2002-08-25 13:27 ` Lars J. Aas
2002-08-25 16:01 ` Lynn Winebarger
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