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From: Jung-uk Kim <jkim@FreeBSD.org>
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Date: Fri, 9 Mar 2012 13:31:19 -0500
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Cc: Dimitry Andric <dim@freebsd.org>, Jia-Shiun Li <jiashiun@gmail.com>
Subject: Re: boot2 overflow when building with clang
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On Thursday 08 March 2012 07:16 pm, Dimitry Andric wrote:
> On 2012-03-07 05:51, Jia-Shiun Li wrote:
> > I am not familiar with boot2, but it looks like allocated size
> > for boot2 is not enough to hold code generated by clang.
> > Reverting r232570 fixes it.
>
> Please test the attached diff.  Since it modifies bsd.sys.mk,
> either run "make install" in share/mk, or use "make buildenv"
> before rebuilding sys/boot/i386/boot2.
>
> It would also be nice if you could test the actual installation of
> the bootstrap, and its proper operation.  However, be sure to have
> some way of recovering the first 16 sectors of your disk before you
> do so. :)

As jhb pointed out, it does not work because BSS for boot2 is not 
automatically cleared.  I fixed this in my branch:

http://svn.freebsd.org/changeset/base/232736
http://svn.freebsd.org/changeset/base/232737

Jung-uk Kim