Previous update: https://discourse.haskell.org/t/ghc-webassembly-weekly-update-2022-12-07
- Cross target emulator support in GHC testsuite. (!9515) The real work is done by @bgamari, this draft MR is just a rebased and cleaned up version of his original one. I managed to run the testsuite with the wasm backend, the overall experience is much smoother than before! Previously I had to use proot to run it so that the testsuite driver can spawn wasm subprocesses transparently, it was extremely flaky and caused a lot of LLVM segfaults that I failed to debug in the end.
- Filed 16 new tickets with the wasm label. Some of those are testsuite failures for me to debug in the coming weeks. There are also lower priority feature requests that I won’t pick up anytime soon, but it may still be better to post them for potential discussion, rather than keeping them as random thoughts in my head.
- Default to .wasm executable extension to match convention in the wasm ecosystem. (!9533)
- Add some missing autoconf checks to base required to fix wasm IPE build. (!9532)
- Minimal repro for LLVM bug #59095.
- Revisit the issue of creating a wasi package as the proper system library and gradually shift away from unix. Looks like a good starting point is generating Haskell bindings for the wasi syscalls from the machine readable wasi spec, then we can layout a plan on making unix reverse dependencies in boot libs support wasi as well.
Overall, I had much more luck in finding bugs than solving them this week. Debugging a compiler backend is always time consuming and a bit stressful, especially so for wasm. Though I’ve solved more fatal bugs before the merge, so there’s no reason these ones cannot be dealt with 
This is the last weekly report of 2022, next one shall come in January. Thanks all for your interest and support, enjoy rest of this year!