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| 2021-04-15 21:27:39 | ← | michalz parts (~user@185.246.204.44) ("Changed major mode") |
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| 2021-04-15 21:28:13 | <maerwald> | Philonous: what problems have you seen when using stackage with cabal? |
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| 2021-04-15 21:28:58 | <maerwald> | I have done so myself with relatively high success... the problem is only converting the snapshot and the stack configuration correctly |
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| 2021-04-15 21:29:35 | <maerwald> | @hackage stack2cabal |
| 2021-04-15 21:29:36 | <lambdabot> | https://hackage.haskell.org/package/stack2cabal |
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| 2021-04-15 21:37:58 | <maerwald> | the other problem is that it's hard to manually tell cabal which revision of a package you want |
| 2021-04-15 21:38:10 | <maerwald> | you can only do so implicitly via the index state |
| 2021-04-15 21:39:02 | <sclv> | i know its not perfect, but ideally one would always want the latest revision (if this isn't true, the revision was done weirdly/wrongly) |
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| 2021-04-15 21:44:20 | <maerwald> | sclv: not necessarily |
| 2021-04-15 21:44:31 | <maerwald> | some revisions break build plans |
| 2021-04-15 21:44:42 | <sclv> | right but they shouldn't |
| 2021-04-15 21:44:48 | <sclv> | they should only rule out invalid builds |
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| 2021-04-15 21:46:31 | <maerwald> | I forgot why that doesn't work, I think because you can't have build plans per GHC version |
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| 2021-04-15 21:47:13 | <sclv> | you can often use base as a proxy |
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| 2021-04-15 21:48:19 | <maerwald> | I'm aware of the GHC-base relationship |
| 2021-04-15 21:48:30 | ← | thblt parts (~thblt@unaffiliated/thblt) ("ERC (IRC client for Emacs 28.0.50)") |
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| 2021-04-15 21:50:16 | <Philonous> | @maerwald, You can download the stackage snaptshot as a cabal.confg directly, e.g. https://www.stackage.org/lts-17.9/cabal.config |
| 2021-04-15 21:50:16 | <lambdabot> | Unknown command, try @list |
| 2021-04-15 21:50:26 | <Philonous> | Oops |
| 2021-04-15 21:50:36 | <maerwald> | sclv: https://github.com/ekmett/contravariant/issues/61 |
| 2021-04-15 21:50:38 | <Philonous> | But as the file says, that sometimes fails because of revisions |
| 2021-04-15 21:50:48 | <maerwald> | Philonous: stack2cabal does a better job at that |
| 2021-04-15 21:51:05 | <maerwald> | sclv: "However, when I actually did bump these version bounds, I discovered that contravariant fails to build with StateVar-1.2 on old GHCs due to changes in Safe Haskell behavior. See here for an example of the error that occurred." |
| 2021-04-15 21:51:12 | <Philonous> | Ah, I didn't know about that tool. Maybe that would be the best of both worlds then |
| 2021-04-15 21:51:23 | <maerwald> | so they changed an upper bound, because of failures of an old GHC version |
| 2021-04-15 21:51:44 | <maerwald> | you can't specify upper bounds depending on GHC versions |
| 2021-04-15 21:52:26 | <maerwald> | either you drop the old GHC version as unsupported, or you revert something that works for *some* GHC versions |
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| 2021-04-15 21:52:51 | <maerwald> | and those who had a valid build plan now have a solver error |
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| 2021-04-15 21:53:31 | <maerwald> | but not sure that's something relevant for stackage, since it's allow-newer anyway |
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