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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 <jdike@addtoit.com> To: Mitch <Mitch@0Bits.COM> CC: linux-kernel@vger.kernel.org References: <453E7F07.9010804@0Bits.COM> 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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