linux-kernel - Re: [RFC] bloody mess with __attribute_

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Message-ID: <Pine.LNX.4.62.0707051000580.17173@nondot.org>
Date:	Thu, 5 Jul 2007 10:02:00 -0700 (PDT)
From:	Chris Lattner <sabre@...dot.org>
To:	Al Viro <viro@....linux.org.uk>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-sparse@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] bloody mess with __attribute__() syntax

On Thu, 5 Jul 2007, Al Viro wrote:
> On Thu, Jul 05, 2007 at 09:41:55AM -0700, Linus Torvalds wrote:
>>> Note that gcc rules for __attribute__() (and that's the only source
>>> of rules we _have_ for the damn thing) clearly say that
>>> 	int __user *p;
>>> is the same thing as
>>> 	int *__user p;
>>
>> Quick question: is there some reason why we have to honor the crazy gcc
>> rules, and cannot try to convince gcc people that they are insane?
>
> AFAICS, they started with storage-class-like attributes.  Consider e.g.
> always_inline or section; these are not qualifiers at all and you want
> to have
> static __attribute__((always_inline)) int foo(int *p);
> interpreted with attribute applied to foo, not to its return type.

This is true, but I don't think this is related.  attributes in GCC can 
apply either to types or two decls.  In this case, the always_inline 
attribute is being applied to the decl, but other attributes could be 
applied to the return type.

-Chris

-- 
http://nondot.org/sabre/
http://llvm.org/
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