I was creating ATtiny13 library install for Arduino IDE 1.6.0 ( from smeezekitty library ), just extract in sketchbook/hardware folder.
It has some new feature like change GCC Optimisation flags from IDE directly. I added -O1 flag because with new compiler in some cases can produce smaller .hex file ( must do some experimenting )
This is the boards i include ( you can change it from board.txt )
and burn Bootloader ( only use to change fuse settings, no real bootloader ) works fine from IDE.
tiny13_for_1.6.0_IDE.zip (42.6 KB)