[avr-gcc-list] Don't use gcc 3.4.4, use 4.0.1

[Ben Jackson]

When I built gcc for AVR I wasn't sure what the Right version of GCC to
use was.  I've been using a cross-compiling GCC 3.4.4 for another platform
with success so I went with that.  However, even with -morder1 and -fnew-ra,
the code is not nearly as good as 4.0.1 for AVR.  My main test file .o text
(at the moment mostly poking bits and doing integer math) got 12% shorter
with -Os (due in no small part to the fact that it's smarter with registers,
resulting in less spilling, resulting in no need for the prolog/eplilog
callouts).

Of course I've got nearly zero experience with both, so I welcome dissenting
opinions, but I wanted to put the recommendation out there for any other
newbies.

-- 
Ben Jackson
<address@hidden>
http://www.ben.com/