Message-ID: <4AA9AB00.9030607@zytor.com>
Date: Thu, 10 Sep 2009 18:42:24 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Roland McGrath <roland@redhat.com>
CC: Linus Torvalds <torvalds@linux-foundation.org>,
       David Daney <ddaney@caviumnetworks.com>, akpm@linux-foundation.org,
       linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
       Ingo Molnar <mingo@redhat.com>, x86@kernel.org
Subject: Re: [PATCH 02/10] x86: Convert BUG() to use unreachable()
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On 09/10/2009 06:37 PM, Roland McGrath wrote:
>> There are other cases where that kind of config-time testing could be 
>> useful, and we could avoid doing various gcc checks dynamically from 
>> within 'make' (along with checking for known-buggy versions etc).
> 
> I quite agree that this would be an improvement for many sorts of compiler
> feature (and other tool detail) conditionalization.

The nicest, of course, would be if gcc exported its internal support,
similar to the way it nowadays export macros for the various internal
data types.

	-hpa
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