In reply to @tks_123:matrix.org
Is there a way to add a haskell package as a flake (i.e. some other haskell project with its own flake.nix) into the haskellPackages of my own haskell project?

so the 25.11 "default" GHC is 9.10, but LLVM only has 18-20 which is incompatible. is this intentional, or is LLVM 15 supposed to be in nixpkgs just to support 9.10 -fllvm?

i back-searched this chat for LLVM but only found conversation on bumping LLVM 12 -> 15

error: Package ‘hip-1.5.6.0’ in /nix/store/aqhcr0kv7d91rfm0ca77rbakjk5gkbq6-source/pkgs/development/haskell-modules/hackage-packages.nix:330406 is marked as broken, refusing to evaluate.

       a) To temporarily allow broken packages, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_BROKEN=1

          Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
                then pass `--impure` in order to allow use of environment variables.

       b) For `nixos-rebuild` you can set
         { nixpkgs.config.allowBroken = true; }
       in configuration.nix to override this.

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
         { allowBroken = true; }
       to ~/.config/nixpkgs/config.nix.


       note: trace involved the following derivations:
       derivation 'mh26'

[34 of 40] Compiling Graphics.Image.Types ( src/Graphics/Image/Types.hs, dist/build/Graphics/Image/Types.o, dist/build/Graphics/Image/Types.dyn_o )
<no location info>: error:
    Simplifier ticks exhausted
  When trying RuleFired Class op $p8ColorSpace
  To increase the limit, use -fsimpl-tick-factor=N (default 100).

  In addition try adjusting -funfolding-case-threshold=N and
  -funfolding-case-scaling=N for the module in question.
  Using threshold=1 and scaling=5 should break most inlining loops.

  If you need to increase the tick factor substantially, while also
  adjusting unfolding parameters please file a bug report and
  indicate the factor you needed.

  If GHC was unable to complete compilation even with a very large factor
  (a thousand or more), please consult the "Known bugs or infelicities"
  section in the Users Guide before filing a report. There are a
  few situations unlikely to occur in practical programs for which
  simplifier non-termination has been judged acceptable.

  To see detailed counts use -ddump-simpl-stats
  Total ticks: 4241

someone's already opened an issue about this upstream

as for a fix, you can always increase the tick tolerance as specified in the error message above or reduce inlining in colorSpace.hs

so i'm trying to fix a package that requires random>=1.3 as a dependency but the version of random in nixpkgs is 1.2. what's the best practice here? do i:

1. create a new package random_1_3_1
2. try and back-patch the package to work with random 1.2
3. override the build deps for that specific package's derivation? (i don't like this option, other packages require random>=1.3 too)