Atmel released the source for their avr-gcc 3.6.1 build
http://distribute.atmel.no/tools/opensource/Atmel-AVR-GNU-Toolchain/3.6.1/But never released it as a binary.
I have built it from source , and have uploaded a "tar.gz" of the binary directory here for
x64 , it's built on a Mint 17.3 (afaik same as a Ubuntu 14.4 LTS)
Download:
https://mega.nz/#!9mQG2QxR!qTBgLy0Uhf_3yctUUskE37R_Zv4JQqdaB9HHuxq6aM8
MD5 Sum should be:
9c8368bd7dca8e89f4cb047757604eeb atmel-3.6.1-x64.tar.gz
The build is mine, but the BUGS are Atmels
Only real difference is that i have moved the
hostlib directory inside the compiler dir, as i wanted all inside same dir
I have included avrdude & avarice in the bin-dir too
Edit: AFAIK the Atmel builds uses static linking, so it might work on most "recent" x64 linux'es
/Bingo