lib/systems: set gcc.arch = "armv6kz", gcc.fpu = "vfpv2" for raspberryPi

[tie]

Description of changes

The CPU in the Raspberry Pi 1 and Zero implements the ARMv6 ISA (with VFP2)
https://wiki.debian.org/RaspberryPi#:~:text=The%20CPU%20in%20the%20Raspberry%20Pi,VFP2%29

See also

• https://en.wikipedia.org/wiki/Raspberry_Pi#Specifications
• Build failure: nodejs cross compiling for raspberry pi armv6l #319036 (comment)

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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (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.

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[tie]

Hm, found #205176 (comment). Probably still worth updating the named platform preset to avoid confusion.

[jue89]

nix build github:tie/nixpkgs/c81d0d5c8c013f09e708e8379f252d3fca21b2ad#legacyPackages.x86_64-linux.pkgsCross.raspberryPi.nodejs results into this build error

error: builder for '/nix/store/1zybrnm373s0nmrlaixpkcl0r650ad8c-nodejs-armv6l-unknown-linux-gnueabihf-20.14.0.drv' failed with exit code 2;
       last 10 log lines:
       >                  [--libdir LIBDIR] [--without-v8-platform]
       >                  [--without-bundled-v8] [--verbose] [--v8-non-optimized-debug]
       >                  [--v8-with-dchecks] [--v8-lite-mode]
       >                  [--v8-enable-object-print] [--v8-disable-object-print]
       >                  [--v8-enable-hugepage] [--v8-enable-maglev]
       >                  [--v8-enable-short-builtin-calls]
       >                  [--v8-enable-snapshot-compression]
       >                  [--node-builtin-modules-path NODE_BUILTIN_MODULES_PATH]
       >                  [--node-snapshot-main NODE_SNAPSHOT_MAIN]
       > configure: error: argument --with-arm-fpu: invalid choice: 'vfpv2' (choose from 'vfp', 'vfpv3', 'vfpv3-d16', 'neon')
       For full logs, run 'nix log /nix/store/1zybrnm373s0nmrlaixpkcl0r650ad8c-nodejs-armv6l-unknown-linux-gnueabihf-20.14.0.drv'.

[tie]

@jue89, please see #327653 for Node.js part.

[tie]

@alyssais, gentle ping. Would you mind taking a look at this?

[tie]

Hm, found #205176 (comment). Probably still worth updating the named platform preset to avoid confusion.

Also cc @samueldr. We still have product-named platforms and I think it makes sense to have reasonable defaults, even if we intend to remove them in the future.