Recompiled AVR toolchain

[ffissore]

This is a drop-in replacement for the AVR toolchains

Currently there are three different AVR toolchains: based on Ubuntu 9 (linux), Crosspack (macosx), WinAVR (windows)
There are no instructions about how they were built and patched.

A repository has been set up with the instructions (scripts) and patches needed to compile the AVR toolchain on each supported platform: https://github.com/arduino/toolchain-avr

This way:

• there is a common place for all of us to play with the toolchain so that every effort we make to improve it (including updating it) is tracked by git and runnable by everyone on every OS (ie: the linux guy can come out saying "I've a 4.5 working" and the windows guy can compile and test it)
• we put some order

[ffissore]

I've set up a nightly build. You can download a version of the IDE with the updated toolchain from

http://downloads.arduino.cc/arduino-avr-toolchain-nightly-linux32.tgz
http://downloads.arduino.cc/arduino-avr-toolchain-nightly-linux64.tgz
http://downloads.arduino.cc/arduino-avr-toolchain-nightly-macosx.zip
http://downloads.arduino.cc/arduino-avr-toolchain-nightly-windows.zip

[arnakke]

Does this mean arduino will eventually move to gcc 4.7+ ? The debian arduino package uses the default avr-gcc (4.7 for Wheezy) and it works flawlessly producing smaller binary code size - 14% smaller on one of my projects compared to the ancient gcc that ships with the official arduino packages.

[ffissore]

@arnakke One of the goal is indeed making it easier to upgrade the toolchain. If you wish to contribute, you shall fork https://github.com/arduino/toolchain-avr and upgrade the scripts.

[ffissore]

Closing: since this hasn't been merged and since we have a newer toolchain, we can use it. See #1903