Aside from box86, rocm, and swift, these packages only support a limited set of architectures or systems, and dereference a small attrset with the architecture name or the like. This works fine if you are only targeting x86_64 or amd64, however it doesn’t work on riscv. I have added throw fallbacks to the ones that cause failures in nixpkgs’ release checks.

rocm and swift use LLVM as the code generator, which does support RISC-V but I have not verified if they support RISC-V so i kept them disabled.

This doesn’t fully fix the errors, as many derivations require the arch property to be set in the parsed CPU info. It is unclear to me whether this is a bug in lib/systems/parse.nix or whether that property is just deprecated

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• Nixpkgs 25.11 Release Notes (or backporting 24.11 and 25.05 Nixpkgs Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
• NixOS 25.11 Release Notes (or backporting 24.11 and 25.05 NixOS Release notes)
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other contributing documentation in corresponding paths.

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