ghc8.10.x: update cabal-install version to 3.4.0.0

[eviefp]

Not entirely sure if this is the correct solution, but cabal-install fails on pretty much all GHC 8.10.x since its update. Is this the correct way to fix the problem?

[cdepillabout]

@maralorn I vaguely remember that you were trying to fix something related to cabal-install lately?

I kind of forget what the problem was though. Was there a problem compiling cabal-install-3.4.0.0 in nixpkgs? Or was it only a problem in building with ghc-8.10?

[maralorn]

Well, at the point when I was involved with that stuff cabal-install was simply not released.

But no I don‘t think that the proposed fix is the right approach here. I think the purpose of the assert here is to make sure, that the Cabal version override does not get applied to a wrong cabal-install version.

[eviefp]

Well, I'm either doing something wrong, or everything (8.x) is currently broken because of this assert, because cabal-install was updated to 3.4.0.0 on hackage.

[maralorn]

Yeah, cabal-install 3.4 was released. Which broke the assert as expected.

[eviefp]

Okay then. Would you mind elaborating on what would be the right approach in fixing it? Or pointing me to any bit of the documentation, or a previous PR which did something similar?

[maralorn]

@Vladciobanu I am limited on brain power right now. My best guess is waiting until today evening, because I am sure peti will fix it quickly in the stream.
But maybe I will have a poke at it until then. I’ll try to keep you updated.

[cdepillabout]

@maralorn fixed this in #114469.

Thanks for pointing this out @Vladciobanu!