linux-kernel - Re: [PATCH] Use more gcc extensions in the Linux headers

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Message-Id: <1173503968.3104.65.camel@nigel.suspend2.net>
Date:	Sat, 10 Mar 2007 16:19:28 +1100
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Valdis.Kletnieks@...edu
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Use more gcc extensions in the Linux headers

Hi.

On Fri, 2007-03-09 at 23:03 -0500, Valdis.Kletnieks@...edu wrote:
> On Sat, 10 Mar 2007 09:57:32 +1100, Rusty Russell said:
> 
> > +/* GCC is awesome. */
> >  #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])			      \
> >  	+ sizeof(typeof(int[1 - 2*!!__builtin_types_compatible_p(typeof(arr), \
> >  		 typeof(&arr[0]))]))*0)
> 
> -/* GCC is awesome. */
> +/* GCC leaves me speechless. */

A speechless Rusty would be horrible. That said, it would be nice if the
comment was something more like the normal Rusty pearl of wisdom. I
understand the first part, but have no idea was + sizeof(typeof(int[....
does...

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