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2020-11-12 07:52:52 <dminuoso> jackdk: btw did you settle on a name for those isos?
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2020-11-12 08:29:01 hackage futhark 0.18.3 - An optimising compiler for a functional, array-oriented language. https://hackage.haskell.org/package/futhark-0.18.3 (TroelsHenriksen)
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2020-11-12 08:30:15 <daydaynatation> cabal install gtk -f have-quartz-gtk, what does the -f mean?
2020-11-12 08:30:30 <c_wraith> it sets a flag
2020-11-12 08:31:14 <c_wraith> the cabal file uses the flag in conditionals that can affect lots of things. in this, most likely the native dependency
2020-11-12 08:31:29 <daydaynatation> I see.
2020-11-12 08:31:41 <c_wraith> I'd take that flag to mean it's the quartz version of gtk, rather than the X version
2020-11-12 08:32:03 <c_wraith> (because even on OS X, you can run an X server and build GTK for X)
2020-11-12 08:32:31 <daydaynatation> I've successfully build and installed gtk with the above command
2020-11-12 08:33:01 hackage ghc-exactprint 0.6.3.3 - ExactPrint for GHC https://hackage.haskell.org/package/ghc-exactprint-0.6.3.3 (AlanZimmerman)
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2020-11-12 08:33:04 <daydaynatation> but when I try cabal install threadscope which requires gtk, it not only requires me to build gtk again, but it also failed
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2020-11-12 08:36:05 <merijn> Oh, let me guess you have cabal-install 3.0 or later?
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2020-11-12 08:37:24 <merijn> See, this why we should've banned feature flags from Hackage years ago to stop people from building things that are just cursed and broken >.>
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2020-11-12 08:39:06 <daydaynatation> merijn: yes, version 3.2
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2020-11-12 08:41:52 <merijn> daydaynatation: You are getting hosed by gtk abusing things in ways they're not supposed to and that accidentally working for years...
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2020-11-12 08:42:47 <merijn> daydaynatation: Try the following: clone threadscope from github, change directory to it, then use "cabal install --projectfile=cabal.project.osx"
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2020-11-12 08:45:31 <merijn> daydaynatation: Essentially, flags were never intended to and shouldn't affect the public API/build setup of packages, but people abuse them for that anyway. Which worked fine in old cabal-install's because it would use "whatever version was already installed" (like the gtk you installed just now). But in >3.0 the buildplan doesn't depend on what's already installed
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2020-11-12 08:49:00 <tomsmeding> can't you tell cabal to set a flag on some particular package in the dependency tree?
2020-11-12 08:49:15 <merijn> tomsmeding: In cabal.project, yes. Not in your cabal file
2020-11-12 08:49:20 <tomsmeding> ah right
2020-11-12 08:49:22 <merijn> tomsmeding: And that is intentional
2020-11-12 08:49:43 <merijn> So people can't use flags to control what feature/API is exposed
2020-11-12 08:49:47 <tomsmeding> to be fair, is there another way for packages like gtk to have public "parameters"?
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2020-11-12 08:49:51 <merijn> But, of course, that's not stopped anyone
2020-11-12 08:50:20 <merijn> tomsmeding: Make a core library that's wrapped by gtk-quartz and gtk-x11
2020-11-12 08:50:53 <merijn> Also, the (now mostly stalled) work on backpack
2020-11-12 08:50:54 <tomsmeding> because this feels like a so-called desire path :p
2020-11-12 08:51:12 → cfricke joins (~cfricke@unaffiliated/cfricke)
2020-11-12 08:51:53 <merijn> tomsmeding: You need to invert your interface so instead of conditionally depending on something you wrap. See persistent and the various persistent-postgres, persistent-sqlite, etc. wrappers
2020-11-12 08:52:06 <merijn> Selda does the same, diagrams does that
2020-11-12 08:52:15 <tomsmeding> yeah I've seen the pattern
2020-11-12 08:52:23 <benschza> Good morning everyone! I've been exploring Arrows and Yampa, and have reached a type error that I'm struggling to interpret. The resulting type seems so close, but I'm using this as a project to continue learning Haskell, so I'm in the deep end. `Expected type: SF (SF () State) (Event (SF () State))` and `Actual type: SF State (Event (SF () State))` - here's a gist: https://gist.github.com/BenSchZA/57f1f46ec8e2ecc0f304ede813e5f4eb I think my
2020-11-12 08:52:23 <benschza> question is two fold, what am I missing, and how can I improve my translation of Arrow proc notation into pure Arrow notation. Appreciate any guidance!
2020-11-12 08:52:28 → Yumasi joins (~guillaume@2a01cb09b06b29ea6448a1be2d68fad7.ipv6.abo.wanadoo.fr)
2020-11-12 08:53:07 <merijn> benschza: I think there's, like, a handful of people who actually know/understand Arrow notation :p
2020-11-12 08:53:30 hackage phonetic-languages-constaints 0.3.0.0 - Constraints to filter the needed permutations https://hackage.haskell.org/package/phonetic-languages-constaints-0.3.0.0 (OleksandrZhabenko)
2020-11-12 08:54:12 <merijn> tomsmeding: The only other option is to modify Cabal to allow people to specify constraints on their *transitive* dependencies, which is clearly a nightmare
2020-11-12 08:54:47 <tomsmeding> benschza: this is probably ghc doing type inference and showing the error far from where it actually occurred. Suggestion: add lots of manual type signatures on your intermediate values, and see where it doesn't match up with reality
2020-11-12 08:55:25 <tomsmeding> merijn: indeed that would be interesting if you have two dependencies A and B that both depend on different configurations of a single package C
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