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Date: Tue, 10 Jul 2007 13:44:47 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Segher Boessenkool <segher@kernel.crashing.org>
CC: Jan Engelhardt <jengelh@computergmbh.de>, linux-kernel@vger.kernel.org,
       linux-arch@vger.kernel.org, andi@firstfloor.org,
       akpm@linux-foundation.org
Subject: Re: [x86 setup 16/33] String-handling functions for the new x86 setup
 code.
References: <11840359321823-git-send-email-hpa@zytor.com> <11840360383913-git-send-email-hpa@zytor.com> <11840361432207-git-send-email-hpa@zytor.com> <11840362483663-git-send-email-hpa@zytor.com> <11840363531039-git-send-email-hpa@zytor.com> <11840364593068-git-send-email-hpa@zytor.com> <1184036564610-git-send-email-hpa@zytor.com> <11840366692770-git-send-email-hpa@zytor.com> <11840367741994-git-send-email-hpa@zytor.com> <11840368791603-git-send-email-hpa@zytor.com> <11840369841576-git-send-email-hpa@zytor.com> <11840370903975-git-send-email-hpa@zytor.com> <11840371953778-git-send-email-hpa@zytor.com> <11840373002601-git-send-email-hpa@zytor.com> <11840374052662-git-send-email-hpa@zytor.com> <1184037510289-git-send-email-hpa@zytor.com> <11840376162370-git-send-email-hpa@zytor.com> <Pine.LNX.4.64.0707102022400.11053@fbirervta.pbzchgretzou.qr> <4693D183.9060604@zytor.com> <298A54C9-B331-4AB9-98B3-5C815B04381E@kernel.crashing.org>
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Segher Boessenkool wrote:
>> Nope.  The builtins not only vary between gcc versions, but they also
>> have a nasty tendency to generate calls to library functions, sometimes
>> libgcc functions.  Hence -ffreestanding.
> 
> -ffreestanding will still generate calls to libgcc functions.
> -ffreestanding doesn't disable _all_ of the C library, either.
> 

No, it doesn't, but it does inhibit builtin functions, and so provides a
bit more ABI stability.

	-hpa