| 23 Sep 2025 |
 Teo (he/him) | Is there an easy way to create a dev shell where I can use GHC with the llvm backend? Ideally without having to recompile ghc | 12:25:26 |
| Teo (he/him) | Oh wait maybe it's fine with stuff just being on the PATH | 12:27:39 |
| Teo (he/him) | it spews some warnings about versions but continues anyway | 12:27:54 |
 sterni (he/him) | teo (they/he): (ghc.withPackages.override { useLLVM = true; }) (p: [ … ]) it's even documented :-) | 13:26:01 |
| sterni (he/him) | though you still have to pass -fllvm that's a misleading name (thanks to me) | 13:26:23 |
| Teo (he/him) | Nice thanks! Yeah it's a bit silly. Hopefully we will have better ways to specify these things soon. | 13:36:24 |
| Teo (he/him) | * Nice thanks! Yeah it's a bit silly. Hopefully we will have better ways to specify these things soon (through like the toolchain specification or something). | 13:37:07 |
 Alex | In reply to @teoc:matrix.org
Nice thanks! Yeah it's a bit silly. Hopefully we will have better ways to specify these things soon. The replaceStdenv stuff already exists, but it won't save you from rebuilding GHC. | 19:02:13 |
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| 24 Sep 2025 |
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| 25 Sep 2025 |
 bglgwyng | If a package is not affected by foo-package.override { random = ... }, which means random is not overridden but remains as the one in haskellPackages, what are some things I can try to investigate further | 08:53:03 |
| bglgwyng | The package overrides other than random works well | 08:53:22 |
| bglgwyng | * If a package is not affected by foo-package.override { random = ... }, which means random is not overridden but remains as the one in haskellPackages, what are some things I can try to investigate further? | 09:00:44 |
 maralorn | I can’t think of anything straightforward. Best ideas is a) there is a second override which negates your first override b) you are mistakingly not actually passing a different random. I can think of wilder theories, but they will be even more likely to be wrong. | 09:30:59 |
| bglgwyng | I tried overriding it at the last place like,
{ packages.hip = config.cabal-projects.default.packages.hip.override { random = config.cabal-projects.default.packages.random; }; }
but still same
| 09:32:13 |
| sterni (he/him) | bglgwyng: Haskell dependencies need to be propagated, so any given package sees its transitive Haskell dependency closure. random is pretty common, so probably somewhere the non overridden random is visible. Cabal is free to pick any version within bounds. | 10:58:17 |
| sterni (he/him) | hip doesn't have bounds on random at all, so maybe it picks another version? You can force it a specific version via the --constraint configure flag, but you'll likely run into trouble with this since Haskell isn't designed for multiple versions of the same package being linked into the same end product. | 10:59:55 |
