From: Richard Henderson <rth@redhat.com>
To: David Mosberger-Tang <David.Mosberger@acm.org>
Cc: torvalds@osdl.org, davidm@mostang.com, linux-kernel@vger.kernel.org
Subject: Re: GCC 3.4 Heads-up
Date: Tue, 6 Jan 2004 14:33:02 -0800 [thread overview]
Message-ID: <20040106223302.GB18646@redhat.com> (raw)
In-Reply-To: <ug3casyegk.fsf@panda.mostang.com>
On Tue, Jan 06, 2004 at 01:06:19PM -0800, David Mosberger-Tang wrote:
> This works provided you can take the address of the lvalue, which
> ain't true for bitfields.
Indeed. Which means that the compiler almost certainly would have
done the wrong thing in certain cases with the conditional lvalue
extension.
There were real, hard to fix bugs here. Rather than sweat too much
about what the "right" semantics are supposed to be, and how to get
them all "correct", we just removed the ill-thought extension.
> I'd love to know a way of doing this in ANSI C99 without requiring
> changes to to uses of this kind of (atrocious) macro...
In ANSI C you've no alternative except memcpy, since you can't cast
the pointer and reference the object via some other type (assuming
neither type is char, yadda yadda).
r~
next prev parent reply other threads:[~2004-01-06 22:33 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <16PqK-8eK-1@gated-at.bofh.it>
[not found] ` <16RiU-2kO-1@gated-at.bofh.it>
[not found] ` <16S5h-3no-5@gated-at.bofh.it>
2004-01-06 21:06 ` GCC 3.4 Heads-up David Mosberger-Tang
2004-01-06 22:33 ` Richard Henderson [this message]
2004-01-06 23:23 ` Linus Torvalds
2004-01-07 9:54 ` Richard Henderson
2003-12-26 11:02 linux
2003-12-26 20:05 ` Linus Torvalds
2003-12-27 16:39 ` Andreas Schwab
-- strict thread matches above, loose matches on Subject: below --
2003-12-26 1:46 Chris Meadors
2003-12-26 3:46 ` H. Peter Anvin
2003-12-26 4:34 ` Linus Torvalds
2003-12-26 6:04 ` H. Peter Anvin
2003-12-26 6:58 ` Andy Isaacson
2003-12-26 7:07 ` H. Peter Anvin
2003-12-26 7:08 ` Linus Torvalds
2003-12-29 16:13 ` David Lloyd
2004-01-02 21:57 ` Bill Davidsen
2004-01-03 21:11 ` Krzysztof Halasa
2004-01-04 5:48 ` Bill Davidsen
2004-01-04 20:41 ` Linus Torvalds
2004-01-05 1:28 ` Bill Davidsen
2004-01-05 1:38 ` Måns Rullgård
2004-01-05 23:49 ` Ingo Oeser
2004-01-05 2:25 ` Linus Torvalds
2004-01-05 4:15 ` Bill Davidsen
2004-01-05 4:36 ` Linus Torvalds
2003-12-30 1:37 ` Rusty Russell
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