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.
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
-------- Original Message --------
Subject: Re: More uml build failures on 2.16.19-rc3 and 2.6.18.1
Date: Wed, 25 Oct 2006 11:41:30 -0400
From: Jeff Dike <[email protected]>
To: Mitch <[email protected]>
CC: [email protected]
References: <[email protected]>
On Wed, Oct 25, 2006 at 01:00:55AM +0400, Mitch wrote:
I've definetly not done any such change on my machine. Remember with the
same compile, same environment, if i go back to 2.6.18 i can build uml
fine. If i move to 2.6.18.1 or above it breaks...
You're sure about that? I just looked through the 2.6.18.1 changelog and
I see nothing that would cause this.
I do notice my gcc stddef does have this defined
% grep offsetof /usr/lib/gcc/i686-linux/4.0.3/include/stddef.h
#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
I would do a -E build and make sure that this header, or another one that
defines offsetof is getting pulled in.
Jeff
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