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Date: Tue, 10 Jul 2007 13:44:47 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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Subject: Re: [x86 setup 16/33] String-handling functions for the new x86 setup
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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
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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