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

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Message-Id: <C65610C3-64A5-476D-8371-1338FA8F7D0E@kernel.crashing.org>
Date:	Tue, 10 Jul 2007 23:14:38 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	"H. Peter Anvin" <hpa@...or.com>
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.

>>> 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.

Yes, Linux should definitely be compiled with -ffreestanding,
it isn't a hosted application after all ;-)


Segher

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