linux-kernel - Re: [x86 setup 13/33] Header file to produce 16-bit code with gcc

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Date:	Tue, 10 Jul 2007 17:21:58 +0200
From:	Andi Kleen <ak@...e.de>
To:	Segher Boessenkool <segher@...nel.crashing.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [x86 setup 13/33] Header file to produce 16-bit code with gcc

On Tuesday 10 July 2007 16:16:29 Segher Boessenkool wrote:
> > gcc for i386 can be used with the assembly prefix ".code16gcc" to  
> > generate
> > 16-bit (real-mode) code.  This header file provides the assembly  
> > prefix.
> 
> This only works correctly with newer GCCs if you pass the
> -fno-toplevel-reorder option (and it only works on older
> GCC versions by accident).

And on older ones (gcc-3.3-hammer / 3.4 / 4.0 ) -fno-unit-at-a-time

Still it seems quite fragile to me agreed.

-Andi
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