[Gentoo GNU/Linux] Failed to merge the stable (3.4.1.0-r1) dev-haskell/cabal package

[Shirumipi]

I have the following error:

Could not load module ‘Data.Array’
It is a member of the hidden package ‘array-0.5.4.0’.

I tried to install the latest unstable version (3.6.3.0) and I was able to install it without any issue.

[hololeap]

1. What ghc version are you using?
2. Are you using packages from the haskell overlay or the main gentoo tree?
3. Please provide relevant build.log
4. What reason do you need to use old dev-haskell/cabal?

[Shirumipi]

1. ghc version: 9.0.2-r4 (stable)
2. The main Gentoo tree
3. Build.log here: https://bpa.st/27IQ
4. I don't know because it was pulled as a dependency ( I suppose) but I forgot which package brought it. By the way, I did not know that this cabal package was old.

[hololeap]

Thanks for the explanation. This bug tracker is for the ::haskell overlay which has newer versions of dev-haskell/cabal, but it's fine that you reported here.

It looks like you're using ghc-9.2.*, although it's hard to tell from the build log. If you were using ghc-9.0.2-r4, it should trigger CABAL_CORE_LIB_GHC_PV which skips building Cabal and just uses the version bundled with GHC.

gentoo-haskell/dev-haskell/cabal/cabal-3.4.1.0-r1.ebuild

Line 68 in d505f27

CABAL_CORE_LIB_GHC_PV="9.0.2"

Also, I see that in your build log that it is using a newer version of Cabal which comes bundled with ghc-9.2, which is more evidence that you're using a newer version of GHC than you specified.

* Using cabal-3.6.3.0

The best way to know for sure is to run:

/usr/bin/ghc --info

[hololeap]

If you're using an ~arch version of GHC, I highly recommend adding all of dev-haskell/* to package.accept_keywords, as well as whatever "target" packages (e.g. pandoc, shellcheck) you plan on using:

echo 'dev-haskell/*' >> /etc/portage/package.accept_keywords/haskell
echo 'app-text/pandoc' >> /etc/portage/package.accept_keywords/haskell

(I recommend this in general because the stable versions are OLD)

---

Could not load module ‘Data.Array’
It is a member of the hidden package ‘array-0.5.4.0’.

This did actually uncover a bug, so thanks for reporting!

[Shirumipi]

Hi Hololeap,

Thanks a lot for your help!

In fact, as the stable version is bugged, I decided to merge the unstable one.
I will roll back to the next stable version.

Shiru