linux-kernel - Re: [PATCH] utilize _Static_assert() for BUILD_BUG

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Message-Id: <20121105142944.7b16e6a4.akpm@linux-foundation.org>
Date:	Mon, 5 Nov 2012 14:29:44 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Jan Beulich" <JBeulich@...e.com>
Cc:	<rusty@...tcorp.com.au>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] utilize _Static_assert() for BUILD_BUG_ON() when the
 compiler supports it

On Fri, 02 Nov 2012 14:47:40 +0000
"Jan Beulich" <JBeulich@...e.com> wrote:

> This makes the resulting diagnostics quite a bit more useful.

So asserts Jan, but to confirm it I would need to download, configure,
build and install a different gcc version, which sounds rather a hassle.

So, please show us an exmple of these diagnostics in the changelog.

> --- 3.7-rc3/include/linux/bug.h
> +++ 3.7-rc3-static-assert/include/linux/bug.h
> @@ -27,8 +27,15 @@ struct pt_regs;
>     result (of value 0 and type size_t), so the expression can be used
>     e.g. in a structure initializer (or where-ever else comma expressions
>     aren't permitted). */
> +#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)

This sort of logic is normally performed via the
include/linux/compiler*.h system.  And

	grep __GNUC include/linux/*.h

indicates that we've been pretty successful.  Can we do that here too?

(eg: suppose the Intel compiler supports _Static_assert?)

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