FSF gcc-4.x for Atmel AVR cross-development

Included is the basic C++ compiler, although this is only of limited
use without a libstdc++, and it is little tested.

Supported debugging formats: -gdwarf-2 [default], -gstabs
Local patch added: OS_main attribute

Locally added support for the following AVR devices:

  ATmega32C1, ATmega64C1, ATmega32M1, ATmega64M1
  ATmega16U4, ATmega32U4, ATmega32U6
  ATmega128RFA1
  M3000F, M3000S, M3001B
  AT90SCR100
  ATtiny13A
  ATtiny87, ATtiny167, ATtiny327
  AT90PWM81
  ATxmega64A1, ATxmega128A1, ATxmega64A3, ATxmega128A3, ATxmega256A3,
  ATxmega256A3B

WWW: http://gcc.gnu.org/
WWW: http://www.nongnu.org/avr-libc/