linux-kernel - Re: [RFC][PATCH] A generic boolean

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Message-ID: <je4pws1ofb.fsf@sykes.suse.de>
Date:	Fri, 04 Aug 2006 18:00:24 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Jes Sorensen <jes@....com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Jeff Garzik <jeff@...zik.org>,
	ricknu-0@...dent.ltu.se, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...l.org>
Subject: Re: [RFC][PATCH] A generic boolean

Jes Sorensen <jes@....com> writes:

> Alan Cox wrote:
>> Ar Gwe, 2006-08-04 am 16:35 +0200, ysgrifennodd Jes Sorensen:
>>> The proposed patch makes it u1 - if we end up with arch specific
>>> defines, as the patch is proposing, developers won't know for sure what
>>> the size is and will get alignment wrong. That is not fine.
>>
>> The _Bool type is up to gcc implementation details.
>
> Which is even worse :(

It's part of the ABI, just like any other C type.

>>> If we really have to introduce a bool type, at least it has to be the
>>> same size on all 32 bit archs and the same size on all 64 bit archs.
>>
>> You don't use bool for talking to hardware, you use it for the most
>> efficient compiler behaviour when working with true/false values.
>
> Thats the problem, people will start putting them into structs, and
> voila all alignment predictability has gone out the window.

Just like trying to predict the alignment of any other C type.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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