linux-kernel - Re: [x86 setup 16/33] String-handling functions for the new x86 setup code.

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Message-ID: <4693EFBF.4070605@zytor.com>
Date:	Tue, 10 Jul 2007 13:44:47 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Segher Boessenkool <segher@...nel.crashing.org>
CC:	Jan Engelhardt <jengelh@...putergmbh.de>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	andi@...stfloor.org, akpm@...ux-foundation.org
Subject: Re: [x86 setup 16/33] String-handling functions for the new x86 setup
 code.

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
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