32bit-userland: A Shell repository from dang

Run Gentoo amd64?  Interested in a 32bit userland for it?  Willing to deal
with failures and fix them?  This is for you!

This is an overlay and a profile for 32bit userland on 64bit Gentoo.  It's hard to use.

This overlay uses i686 as your CHOST.  It is important that you set CHOST
propery in your profile to use this overlay.

Boot an amd64 boot CD, and install an i686 stage3.  Set up this overlay, and
copy this profile over your portage, and pick the 32bit-userland profile.

Patch your toolchain.eclass

Copy 64bit libc from your amd64 box  into /lib64 and /usr/lib64.  You'll need:
/lib64/libc.*
/lib64/ld-*
/lib64/libpthread*
/lib64/libm.*
/lib64/libm-*
/usr/lib64/libc.*
/usr/lib64/libc_*
/usr/lib64/crt*
/usr/lib64/libpthread*
/usr/lib64/libm.*

From CD, mv /lib -> /lib32 and symlink /lib32 lib (and for /usr/lib)

Copy /etc/env/04multilib to the chroot and remove /lib:/usr/lib:

Emerge a multilib gcc.
	- Make sure gcc has -mudflap
	- FEATURES: -sandbox userpriv
	- Change uintptr_t in <stdint.h> to be always 64 bit

Emerge a multilib glibc.
	- FEATURES: -sandbox -userpriv

Re-emerge python so it knows it's in lib32 not lib

You now have a working 32bit-userland sysetem.  Remeber to use those features
when compiling gcc or glibc/linux-headers.  Especially linux-headers: it will
install empty headers with sandbox or userpriv, and this will break
*everything*.

Make sure to select a 64bit kernel and enable 32bit emulation.

I've included a script in this overlay named ttsync.  It allows you to sync
your portage and fixes your profile and toolchain.eclass.  Use it instead of
emerge --sync or eix-sync
dang/32bit-userland
