Update to use latest protobuf

[michaeldelago]

This is based on the work in #434 by @Partmedia

This PR adds the missing include statements as well as a few tweaks to the Makefile to get everything working.

Changes to the Makefile

• use -std=c++17 instead of -std=c++14. It wasn't working on my machine with 14
• use pkg-config to setup linking for absl and protobuf
  • absl apparently only supports Bazel and CMake. There's a BUILD file in there but I have no idea how to use bazel and the README.md states to use make

[Partmedia]

Thanks for improving on this. I have to remember to go back and fix the workflows on my PR :')

I might offer that the reason only c++17 works is that you may be linking to a system abseil library compiled with C++17 flags (the linked library is not cross-C++ runtime ABI compatible). That's why I also needed C++17 on my machine to get this to compile, but I opted not to include that in the PR.

[Slids]

Fails CI (which should at least pass ccl and sbcl

[michaeldelago]

CI fixed (maybe). They weren't installing absl in the setup steps.

I might offer that the reason only c++17 works is that you may be linking to a system abseil library compiled with C++17 flags (the linked library is not cross-C++ runtime ABI compatible).

That makes sense. I'm using the current version of protobuf that's in the Arch Linux package repository, so I didn't compile it myself.

[Slids]

CCL and SBCL are not yet passing CI

[Slids]

So, the issue is the ubuntu repository used in ubuntu-latest doesn't have absl_absl_log in libabsl-dev.

[Slids]

https://abseil.io/docs/cpp/tools/cmake-installs
Will tell you how to build and install.

Installing is slow, not quite sure what to do about that,
but I think it's the best way forward?

Note: This did work.

[michaeldelago]

work picked up - unfortunately too distracted to give this as much time as I wanted

nicely, this is superseded by #438