Package request: fex-emu

[kuruczgy]

Project description

FEX - A fast usermode x86 and x86-64 emulator for Arm64 Linux

Metadata

• homepage URL: https://fex-emu.com/
• source URL: https://github.com/FEX-Emu/FEX
• license: MIT
• platforms: aarch64-linux

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[kuruczgy]

As a starting point, here is the derivation I currently use: https://codeberg.org/kuruczgy/aarch64-gaming/src/commit/f94cce623b97afe2e26bff267529dc12e7c6dd695537c98f0965fc7c9c13640e/overlays/packages/fex-emu/default.nix

[kuruczgy]

First non-trivial thing is that the source repo includes some submodules with pre-built binaries for testing. In order to be able to say sourceProvenance = [ lib.sourceTypes.fromSource ]; with confidence it's best if these are not present during building.

Fortunately according to the maintainer this is a supported use-case: FEX-Emu/FEX#4267
He even provided a list of further directories that we can remove from the source tree to reduce its size further.

This can either be solved with a postFetch hook, or we might want to add a new option to fetchgit to filter submodules.

[kuruczgy]

FEX plans to require ARMv8.4-a by mid-2025, so we might want to already package for that to be future proof: FEX-Emu/FEX#4120

Not sure if there is any sane way to mark a package as requiring something higher than ARMv8 though.

[kuruczgy]

Oops it seems that someone else already added fex recently and I forgot to check: #352205

I will close this issue for now, and open different PRs/issues for my comments above.