And after a long month of upgrades, I have at last merged SM78 !
0 A.D. now uses the latest "Stable" Spidermonkey release. The next one will be SM94, I believe, which won't come for a little while still.
This version requires "LLVM-objdump" to compile. You will probably need to install LLVM binaries, if you're compiling using GCC (if you're using clang, you probably already have it). Depending on your distro, this could be a in various packages. If you can, update the https://trac.wildfiregames.com/wiki/BuildInstructions with the correct instructions
As usual, use this thread to report issues.
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NB: we know that there is an issue with GCC 7.5. Fixes include upgrading to GCC 8 or applying D3181 from Phabricator.