| 25 Sep 2025 |
 sterni | https://cabal.readthedocs.io/en/stable/setup-commands.html#cmdoption-runhaskell-Setup.hs-configure-dependency | 15:26:31 |
 maralorn | Ah, nice. | 15:27:13 |
| maralorn | That’s less complicated than what I had in mind. | 15:27:28 |
| sterni | I think the problem here is figuring out the right installed package identifier. I believe how this is computed is pretty much internal to Cabal | 15:27:35 |
| maralorn | You can most certainly not know it a nix eval time. So you will probably need to do some finding through build inputs. | 15:28:33 |
| 26 Sep 2025 |
 bglgwyng | Maybe I'm doing something hacky so I want to convince my self;
did the same thing happen when we tried to override a pakcage with the same version in haskell.packages and different transitive dependencies? | 03:28:54 |
| bglgwyng | yes this worked | 03:41:00 |
|  @aspendowntime:matrix.org removed their profile picture. | 05:46:41 |
| @aspendowntime:matrix.org removed their display name Eden (they/it/she). | 05:47:00 |
| @aspendowntime:matrix.org left the room. | 05:47:41 |
| bglgwyng | Where is pkgsHostTarget passed from?
https://github.com/NixOS/nixpkgs/blob/5364a5ff96df5c2e3b1048914f90fc39530087c2/pkgs/development/haskell-modules/generic-builder.nix#L641 | 09:28:48 |
| sterni | pkgs/stdenv/generic/setup.sh | 09:51:35 |
| sterni | yes this also happens in that case, hence you need to overrideScope | 09:52:08 |
| maralorn | A recent ghc version started embedding links to the ghc error index via terminal control codes. | 14:14:39 |
| maralorn | That doesn’t seem to work in nix logs. | 14:15:07 |
| maralorn | Does anyone know how that can be fixed? | 14:15:23 |
| maralorn | If not maybe we should deactivate/strip it? | 14:15:41 |
| maralorn | Looks like that for me:
<no location info>: warning: [8;;https://errors.haskell.org/messages/GHC-42258GHC-422588;;] [-Wunused-packages]
| 14:16:36 |
 Alex | My guess is that [8;; is some kind of terminal escape code.
Although undesirable, does disabling colours work? | 15:03:59 |
 teo (they/he) | A quick glance at the GHC codebase points me to GHC.Types.Errors where it seems like this is always emitted irrespective of whether you are in a fancy terminal. We probably shouldn't do that | 15:06:29 |
| teo (they/he) | Ah wait no it is a setting | 15:06:50 |
| teo (they/he) | yeah it determines if your terminal supports colours and only uses it in that case. And you can disable it with fprint-error-index-links=never | 15:08:23 |
| maralorn | Yeah, but are we sure that nix can’t forward that? I mean it can forward colors. | 15:14:09 |
 chreekat | Sounds like something in the chain does not understand the encoding. Maybe something (nix?) is special cased for colors but not that | 17:04:37 |
