In reply to @mangoiv.:matrix.org
I was lying

In reply to @maralorn:maralorn.de
eh, everyone does it these days, apparently …

Anyway, thanks for pointing me here. Here is my question in case anyone has encountered this before or has debugging pointers:

I am encountering a strange (at least for me) situation when trying to get into a Haskell dev environment with developPackages. I'm basically using this in a larger flake.nix:

...
      haskellEnv = pkgs.haskellPackages.developPackage {
        root = pkgs.lib.sourceFilesBySuffices ./. [ ".cabal" ".hs" ];
        modifier = drv:
          pkgs.haskell.lib.addBuildTools drv (with pkgs.haskellPackages;
            [ cabal-install haskell-language-server ]);
      };
    in
    {
      devShells.${system} = {
        default = haskellEnv;
      };
    };
} 

The environment builds all fine when I do nix develop I drop in the shell and get cabal which I don't have installed otherwise. But cabal build redownloads all Haskell packages before building and I think it doesn't use anything from the nix provided package set. I previously had a Haskell setup where cabal was automatically configured to use the nix package set but I am now trying to switch to developPackage this doesn't seem to work out of the box.

Did anyone encounter this issue or has ideas how to approach this? I can't even find out which configuration cabal uses and thus can't check whether it's configured to point to some nix package set ... 🤔

Anyway, thanks for pointing me here. Here is my question in case anyone has seen this before or has debugging pointers:

I am encountering a strange (at least for me) situation when trying to get into a Haskell dev environment with developPackages. I'm basically using this in a larger flake.nix:

...
      haskellEnv = pkgs.haskellPackages.developPackage {
        root = pkgs.lib.sourceFilesBySuffices ./. [ ".cabal" ".hs" ];
        modifier = drv:
          pkgs.haskell.lib.addBuildTools drv (with pkgs.haskellPackages;
            [ cabal-install haskell-language-server ]);
      };
    in
    {
      devShells.${system} = {
        default = haskellEnv;
      };
    };
} 

The environment builds all fine when I do nix develop I drop in the shell and get cabal which I don't have installed otherwise. But cabal build redownloads all Haskell packages before building and I think it doesn't use anything from the nix provided package set. I previously had a Haskell setup where cabal was automatically configured to use the nix package set but I am now trying to switch to developPackage this doesn't seem to work out of the box.

Did anyone encounter this issue or has ideas how to approach this? I can't even find out which configuration cabal uses and thus can't check whether it's configured to point to some nix package set ... 🤔

In reply to @matto153:matrix.org

Anyway, thanks for pointing me here. Here is my question in case anyone has seen this before or has debugging pointers:

I am encountering a strange (at least for me) situation when trying to get into a Haskell dev environment with developPackages. I'm basically using this in a larger flake.nix:

...
      haskellEnv = pkgs.haskellPackages.developPackage {
        root = pkgs.lib.sourceFilesBySuffices ./. [ ".cabal" ".hs" ];
        modifier = drv:
          pkgs.haskell.lib.addBuildTools drv (with pkgs.haskellPackages;
            [ cabal-install haskell-language-server ]);
      };
    in
    {
      devShells.${system} = {
        default = haskellEnv;
      };
    };
} 

The environment builds all fine when I do nix develop I drop in the shell and get cabal which I don't have installed otherwise. But cabal build redownloads all Haskell packages before building and I think it doesn't use anything from the nix provided package set. I previously had a Haskell setup where cabal was automatically configured to use the nix package set but I am now trying to switch to developPackage this doesn't seem to work out of the box.

Did anyone encounter this issue or has ideas how to approach this? I can't even find out which configuration cabal uses and thus can't check whether it's configured to point to some nix package set ... 🤔

Does anyone know how to get PIE (Position Independent) enabled GHC runtime in Nix? I am trying to build a shared library in Haskell which would have all Haskell dependencies embedded in it, but when using that library in Rust I am getting

relocation R_X86_64_32S against symbol `stg_bh_upd_frame_info' can not be used when making a PIE object; recompile with -fPIE

In reply to @bitestring:matrix.org

Does anyone know how to get PIE (Position Independent) enabled GHC runtime in Nix? I am trying to build a shared library in Haskell which would have all Haskell dependencies embedded in it, but when using that library in Rust I am getting

relocation R_X86_64_32S against symbol `stg_bh_upd_frame_info' can not be used when making a PIE object; recompile with -fPIE