I have ported the kernel MCX11 to MCX12 in order to use it with the MC9S12 microcontrollers family. Visit the GCC2MCX12 page at:
http://perso.orange.fr/jean-michel.roux/68HC12/gcc2mcx12.
GCC2MCX11 revision 3 is also available at:
http://perso.orange.fr/jean-michel.roux/68HC11/gcc2mcx11.

The kernel MCX11 can be used with GCC 68HC11. You can download the zip archive at:
http://perso.orange.fr/jean-michel.roux/68HC11/gcc2mcx11.

Release 3.1 of the GNU HC11/HC12 port is now available.
It is available as source and binary for GNU/Linux and Windows.

It contains the following fixes and improvements:

Gcc
* Upgrade to gcc 3.3.6
* Fix [bug #15493]: Code generation problem on 68HC12
* Fix [bug #13917]: Bug in gcc 3.0.1. Error with pre-decremented pointer array and -Ox switch
* Fix [bug #13879]: gcc gets a bus error upon compiling a file with -mshort and -O2

Gdb
* Upgrade to gdb 6.4

This is available on the following sites:

http://m68hc11.serveftp.org/m68hc11_port.php
http://www.gnu-m68hc11.org

and also on anonymous ftp server:

The GNU Development Chain for 68HC11&68HC12 is facing a new look to promote the
sharing of information between users who would like to contribute.

The documentation will progressively migrate to the Media Wiki system.
This will give the opportunity to users to fix and improve the documentation.
Everybody is encouraged to contribute at any level. The only requirement is to be registered
but this is free.

News and articles will also follow a new integration model through the Drupal
CMS. This should simplify the production of news and articles for the tool chain.

Release 3.0.1 of the GNU Development Chain for 68HC11/68HC12 is available. It is based on Binutils 2.15, Gcc 3.3.5, Gdb 6.2 and Newlib 1.12.0.

It is available as source and binary for GNU/Linux and Windows.

It contains the following fixes and improvements:

Gcc
* Fix [bug #11813] Code generation problem (bset/bclr -m68hc12 -Os
indirect addr)
* Fix [bug #12243] Loop compiles incorrectly (HC12)
* Fix [bug #12297] -fomit-frame-pointer and -Os generate wrong code on
the HCS12
* Fix [bug #12572] internal compiler error; unsigned short in for loop

This is available on the following sites: