Always the same ....

why spent money for something good, that is free ...

http://sdcc.sourceforge.net/

it supports :

8051
AVR
Z80
GBZ80 (Gameboy)

i do all my software with this great compiler. i am using it now for about 3 years, and it gets better and better ...

Lastest offical release is from march. the full sourcecode is available and the latest changes have been done on Monday.

Try it.

Michael