I repeated the toolchain build I did for RC-20150418, this time with the 5.1 release. The texinfo build dependency bug that I noticed in RC-20150418 appears to be fixed, and the code generated for a small (<300 line) program was identical to the code generated by RC-20150418 and RC-20150412.
I made a new github repository just for the build scripts and tagged the version used for building 5.1. https://github.com/nerdralph/make-avr-gcc/tree/5.1
