linux-kernel - Re: More uml build failures on 2.16.19-rc3 and 2.6.18.1

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Message-Id: <200610291857.58707.blaisorblade@yahoo.it>
Date:	Sun, 29 Oct 2006 18:57:58 +0100
From:	Blaisorblade <blaisorblade@...oo.it>
To:	Mitch <Mitch@...ts.com>,
	user-mode-linux-devel@...ts.sourceforge.net
Cc:	jdike@...toit.com, linux-kernel@...r.kernel.org,
	penberg@...helsinki.fi
Subject: Re: More uml build failures on 2.16.19-rc3 and 2.6.18.1

On Saturday 28 October 2006 13:21, Mitch wrote:
> Hi Jeff, all,
>
> Sorry for the dealy but i've been out of the country.
>
> Anyhow i did some investigation and i've figured out the bug.
>
> Essentially if you try to compile a UML kernel on a 2.6.18.1 or above
> *host* kernel

> it will fail with the error messages shown (essentially 
> offsetof macro undefined) because between 2.6.18 and 2.6.18.1 that macro
> in /usr/include/linux/stddef.h is now wrapped in a #ifdef __KERNEL__ .
> However since UML doesn't build it's sources with that defined we get an
> undefined macro and a build failure.

Ok, we have one bug and one mistake on your part:
1) we should include <stddef.h> instead of <linux/stddef.h> in files using 
host headers (I don't have the error message at hand, so please handle this 
yourself, Jeff)
2) /usr/include/{linux,asm} being symlinks inside /usr/src/linux/include is an 
unsupported configuration since ages. #1 is still a valid bug because when a 
distribution will distribute glibc and kernheaders based on 2.6.18.1+/2.6.19 
ones we'll break anyway.

> So i'm partly right and partly wrong in my statement below. Yes i did
> compile a guest UML kernel 2.6.18 fine on host kernel of 2.6.18, and i
> believe i will be able to compile 2.6.18.1 and above also on a host
> kernel of 2.6.18 but if i change my host kernel to 2.6.18.1 or above all
> UML guest builds will fail.
>
> Can someone confirm they can build guest UML kernels on a host kernel >=
> 2.6.18.1 ??
>
> Thanks
> M

-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale! 
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