crosstool-NG settings for a statically-linked AVR toolchain.
The toolchain includes GDB and patched avr-size, that shows program and data usage relative to the target microcontroller. It also includes support for the new AVR series of microcontrollers, and updated libraries for the older ones.
Prebuilt binaries can be downloaded here: https://github.com/rafaelmartins/avr-toolchain/releases