Are you evaluating multiple versions of Nixpkgs?

Needing more than 4 GiB for NixOS evaluation is very unusual...

In reply to @rosscomputerguy:matrix.org
https://github.com/RossComputerGuy/dotfiles/blob/master/flake.nix#L213-L215

I don't think so.

Unfortunately I have no idea how to profile Nix evaluations... I've always been able to just throw more RAM at the problem (since it's only been a problem in VMs for me so far).

In reply to @alex:tunstall.xyz
I guess the old binary search trick could work...
Remove half of the code and see how it affects memory usage.
Then focus your search onto the more memory-consuming half and repeat.

error:
       … while calling the 'head' builtin
         at /nix/store/i0h8hf708hppbk070zsksgqm2k95rxpr-source/lib/attrsets.nix:1574:11:
         1573|         || pred here (elemAt values 1) (head values) then
         1574|           head values
             |           ^
         1575|         else

       … while evaluating the attribute 'value'
         at /nix/store/i0h8hf708hppbk070zsksgqm2k95rxpr-source/lib/modules.nix:816:9:
          815|     in warnDeprecation opt //
          816|       { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          817|         inherit (res.defsFinal') highestPrio;

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/i0h8hf708hppbk070zsksgqm2k95rxpr-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `system.systemBuilderArgs':

       … while evaluating definitions from `/nix/store/i0h8hf708hppbk070zsksgqm2k95rxpr-source/nixos/modules/system/activation/activatable-system.nix':

       … while evaluating the option `system.activationScripts.etc.text':

       … while evaluating definitions from `/nix/store/i0h8hf708hppbk070zsksgqm2k95rxpr-source/nixos/modules/system/etc/etc-activation.nix':

       … while evaluating definitions from `/nix/store/i0h8hf708hppbk070zsksgqm2k95rxpr-source/nixos/modules/system/etc/etc.nix':

       … while evaluating the option `environment.etc."NetworkManager/VPN/nm-openconnect-service.name".source':

       … while evaluating definitions from `/nix/store/i0h8hf708hppbk070zsksgqm2k95rxpr-source/nixos/modules/services/networking/networkmanager.nix':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: cannot bootstrap GHC on this platform ('riscv64-linux' with libc 'defaultLibc')

I cannot find where this etc file is defined lol