@RyanGordon Thanks for keep improve this PR. Please let me know once it's ready for another round review.

@fengli79 Thanks! I will do; I expect this will be ready for review in about a week. I may also close and re-open this as a new PR and squash the commits down so the PR is cleaner

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Hi. I am testing it with protobuf hhvm, but it seems the installation instruction in README file is out of date. Can you please update it introduce how to install it and what the dependencies are.
I installed a lot of things like boost, folly, and have This file requires compiler and library support for the forthcoming ISO C++ 2014 standard. issue during the installation. Can you please introduce where to add --std=gnu++1y. CMAKE_CXX_FLAGS="--std=gnu++1y" cmake . doesn't work.