From: roel kluin <roel.kluin-Re5JQEeQqe8AvxtiuMwx3w@public•gmane.org>
To: Jan Beulich <jbeulich-Et1tbQHTxzrQT0dZR+AlfA@public•gmane.org>
Cc: sfr-3FnU+UHB4dNDw9hX6IcOSA@public•gmane.org,
hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public•gmane.org,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public•gmane.org,
linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public•gmane.org,
kvm-ppc-u79uwXL29TY76Z2rM5mHXA@public•gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public•gmane.org,
linux-next-u79uwXL29TY76Z2rM5mHXA@public•gmane.org
Subject: Re: linux-next: tree build failure
Date: Tue, 29 Sep 2009 11:51:56 +0200 [thread overview]
Message-ID: <25e057c00909290251h55c0dc25o4ab1f2e84c920dca@mail.gmail.com> (raw)
In-Reply-To: <4AC1E15502000078000516B5-Qfbpwmsw6RoS3W1tAdPHOtBPR1lH4CV8@public.gmane.org>
On Tue, Sep 29, 2009 at 11:28 AM, Jan Beulich <jbeulich-Et1tbQHTxzrQT0dZR+AlfA@public•gmane.org> wrote:
>>>> Hollis Blanchard 09/29/09 2:00 AM >>>
>>First, I think there is a real bug here, and the code should read like
>>this (to match the comment):
>> /* type has to be known at build time for optimization */
>>- BUILD_BUG_ON(__builtin_constant_p(type));
>>+ BUILD_BUG_ON(!__builtin_constant_p(type));
>>
>>However, I get the same build error *both* ways, i.e.
>>__builtin_constant_p(type) evaluates to both 0 and 1? Either that, or
>>the new BUILD_BUG_ON() macro isn't working...
>
> No, at this point of the compilation process it's neither zero nor one,
> it's simply considered non-constant by the compiler at that stage
> (this builtin is used for optimization, not during parsing, and the
> error gets generated when the body of the function gets parsed,
> not when code gets generated from it).
>
> Jan
then maybe
if(__builtin_constant_p(type))
BUILD_BUG_ON(1);
would work?
Roel
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next prev parent reply other threads:[~2009-09-29 9:51 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-29 9:28 linux-next: tree build failure Jan Beulich
[not found] ` <4AC1E15502000078000516B5-Qfbpwmsw6RoS3W1tAdPHOtBPR1lH4CV8@public.gmane.org>
2009-09-29 9:51 ` roel kluin [this message]
[not found] ` <25e057c00909290251h55c0dc25o4ab1f2e84c920dca-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-09-30 6:29 ` Jan Beulich
2009-09-29 23:39 ` Hollis Blanchard
[not found] ` <1254267572.15622.1621.camel-yDUrRDS8jBVhsM67afOH+sxtgHpCUUYS@public.gmane.org>
2009-09-30 6:35 ` Jan Beulich
[not found] ` <4AC318450200007800017355-Qfbpwmsw6RoS3W1tAdPHOtBPR1lH4CV8@public.gmane.org>
2009-10-02 15:48 ` Hollis Blanchard
2009-10-05 6:58 ` Jan Beulich
2009-10-09 19:14 ` Hollis Blanchard
2009-10-14 22:57 ` Hollis Blanchard
2009-10-15 7:27 ` Jan Beulich
2009-10-19 18:19 ` Hollis Blanchard
2009-10-20 1:12 ` Rusty Russell
[not found] ` <200910201142.34006.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2009-10-20 1:29 ` Hollis Blanchard
2009-10-20 3:45 ` [PATCH] BUILD_BUG_ON: make it handle more cases Rusty Russell
2009-10-20 13:58 ` Américo Wang
2009-10-20 14:43 ` Alan Jenkins
[not found] ` <9b2b86520910200743h4e134cf8jd2860d42b3936597-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-10-23 1:50 ` Américo Wang
[not found] ` <200910201415.34361.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2009-10-22 21:04 ` Hollis Blanchard
2009-11-05 0:20 ` Stephen Rothwell
2009-11-05 6:28 ` Rusty Russell
[not found] ` <200911051658.36265.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2009-11-05 6:37 ` Rusty Russell
2009-11-05 6:38 ` Stephen Rothwell
[not found] ` <20091105173842.c94ba501.sfr-3FnU+UHB4dNDw9hX6IcOSA@public.gmane.org>
2009-11-06 6:30 ` Rusty Russell
2009-10-29 21:30 ` Hollis Blanchard
2009-11-05 6:01 ` Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2009-12-16 7:21 linux-next: tree build failure Stephen Rothwell
2009-12-16 9:02 ` Felipe Balbi
2009-12-16 10:10 ` Liam Girdwood
2009-10-01 3:19 Stephen Rothwell
2009-10-01 7:58 ` Jens Axboe
2009-10-01 10:41 ` Stephen Rothwell
2009-09-24 5:21 Stephen Rothwell
[not found] ` <20090924152102.8d7d40cf.sfr-3FnU+UHB4dNDw9hX6IcOSA@public.gmane.org>
2009-09-29 0:00 ` Hollis Blanchard
2009-08-17 8:39 Stephen Rothwell
2009-08-03 0:35 Stephen Rothwell
2009-08-03 1:01 ` NeilBrown
2009-08-03 1:30 ` Stephen Rothwell
2009-07-27 7:53 Stephen Rothwell
2009-07-27 9:21 ` Karsten Keil
2009-07-27 15:06 ` David Miller
2009-07-28 4:22 ` Stephen Rothwell
2009-04-07 3:41 Stephen Rothwell
2009-04-07 10:00 ` Mark Brown
2009-04-08 1:48 ` Takashi Iwai
2009-03-23 9:38 Stephen Rothwell
2009-03-23 22:27 ` Mauro Carvalho Chehab
2009-03-23 23:25 ` Stephen Rothwell
2009-03-05 7:41 Stephen Rothwell
2009-03-06 5:01 ` Rusty Russell
2009-01-16 5:37 Stephen Rothwell
2009-01-16 7:25 ` Peter Zijlstra
2009-01-16 9:03 ` Ingo Molnar
2009-01-16 10:39 ` Stephen Rothwell
2009-01-16 10:53 ` Ingo Molnar
2009-01-16 11:53 ` Stephen Rothwell
2009-01-16 12:32 ` Ingo Molnar
2008-11-28 10:04 Stephen Rothwell
2008-11-28 10:25 ` Takashi Iwai
2008-11-28 10:43 ` Stephen Rothwell
2008-11-28 17:23 ` Takashi Iwai
2008-10-21 8:30 Stephen Rothwell
2008-08-25 10:33 Stephen Rothwell
2008-08-25 16:36 ` Steven Rostedt
2008-06-30 14:35 Stephen Rothwell
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