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List:       freebsd-current
Subject:    Re: -current build failure
From:       Konstantin Belousov <kostikbel () gmail ! com>
Date:       2012-07-25 10:05:31
Message-ID: 20120725100531.GG2676 () deviant ! kiev ! zoral ! com ! ua
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On Wed, Jul 25, 2012 at 09:03:58AM +0100, David Chisnall wrote:
> On 24 Jul 2012, at 23:43, Konstantin Belousov wrote:
> 
> > As kan rightfully notes, the assumption that &%fs:0 == *%fs:0 holds for
> > userspace on amd64, and the same is true for %gs userspace on i386.
> > The change you committed to clang/llvm/whatever it called just breaks
> > useful optimization for FreeBSD.
> 
> If you can suggest a way of differentiating the kernel and userspace compilation \
> targets, then I would be happy to hear it and will make the appropriate change.    \
> Until then, I would rather have slightly sub-optimal code in userspace than \
> incorrect code in kernelspace.

Try to differentiate on the memory layout model, the -mcmodel=kernel thing.
It shall be passed down to the very last stage of the backend, I believe.

> 
> > Sigh
> 
> Very helpful, thank you.
> 
> David


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