problems building amd64 kernel

[bobf]

I traced the problem to an entry I had placed in make.conf to correct 
deficiencies in some of the multimedia ports a few months ago (not correctly 
enabling MMX or SSE for amd64 builds).  removing these entries eliminated 
build problems.

-------- Original Message --------
Subject: problems building amd64 kernel, cvsup 3 hours ago, no apparent 
change since
Date: Fri, 25 Jun 2010 17:43:11 -0700
From: bobf <bobf at mrp3.com>
To: freebsd-stable at freebsd.org

RELENG_8 - cvsup appx 15:00 PDT

1.  performed 'make clean' followed by 'make buildworld'.  Build
complained that the architecture "amd64:i386" did not exist (I think
that was the correct error message) on line 139 of Makefile.inc1 .

2.  performed 'make buildworld TARGET=amd64' to force the build target.
  Everything appeared to work until the lib/libc target was reached, at
which point an error on line 3 of syscall.S 'invalid register name %r10'.

It appears that architecture selection is not working properly, and it
prevents libc build from its compiling assembly language files.

uname output

FreeBSD hack.SFT.local 8.0-STABLE FreeBSD 8.0-STABLE #0: Wed Apr  7
11:02:24 PDT 2010     root at hack.SFT.local:/usr/obj/usr/src/sys/GENERIC
amd64