10feb68128
HHVM's been building with this (or equivalent predecessor patches); it gets us a 20x speedup on real-world workloads, at the cost of slightly worse compatibility. This doesn't change the default, just makes it available as an explicit choice.
Library
This directory contains all the code run by the official brew and brew cask commands in Homebrew and all formulae (package descriptions) in taps (repositories containing formulae) in Taps subdirectories.