Stack: No setup information found for ghc-8.4.3 when not installed ncurses version 5

[ncaq]

General summary/comments (optional)

User environment do not have ncurses 5.
But have ncurses 6.

So, [CompilerBuild] not include CompilerBuildStandard.
[CompilerBuild] is tinfo6 and ncurses6.

stack setup fails according to stack-setup-2.yaml.

Steps to reproduce

For example:

1. Prepare an environment with ncurses version 6 instead of 5.(example Gentoo, Arch)
2. Run command stack config set resolver lts.
3. Make sure LTS is 12
4. Run command stack blah.

~yaml
packages: []
resolver: lts-12.0
~

Expected

stack setup install ghc 8.4.3.

Actual

~
% stack setup
Writing implicit global project config file to: /home/ncaq/.stack/global-project/stack.yaml
Note: You can change the snapshot via the resolver field there.
Using latest snapshot resolver: lts-12.0
Downloaded lts-12.0 build plan.
No setup information found for ghc-8.4.3 on your platform.
This probably means a GHC bindist has not yet been added for OS key 'linux64-ncurses6', 'linux64-tinfo6'.
Supported versions: ghc-7.8.4, ghc-7.10.2, ghc-7.10.3, ghc-8.0.1, ghc-8.0.2, ghc-8.2.1, ghc-8.2.2, ghc-8.4.1, ghc-8.4.2
~

Stack version

% stack --version
Version 1.7.1, Git revision 681c800873816c022739ca7ed14755e85a579565 (5807 commits) x86_64 hpack-0.28.2

Method of installation

• Official binary, downloaded from stackage.org or fpcomplete's package repository

Workaround

User install ncurses version 5.

Example, case Gentoo, write sys-libs/ncurses tinfo in package.use, sudo emerge ncurses:5.

[ncaq]

This problem report on Reddit.
Arch Linux have problem too.

[ncaq]

It is the following place of the source code that judges whether it is the standard environment.
stack/Setup.hs at 735240f5b99c343e5d86fa57db0893a3fd05f32a · commercialhaskell/stack

[borsboom]

Unfortunately there has not yet been a fedora27 bindist released for ghc-8.4.3, which is needed to support distros with the newer libtinfo6. @bgamari, are there plans to build this like has been done for the previous ghc-8.4.* releases?

[wdanilo]

The same problem on Gentoo. Just fyi.

[bgamari]

Emanuel Borsboom [e-mail] writes:

Unfortunately there has not yet been a fedora27 bindist released for
ghc-8.4.3, which is needed to support distros the newer libtinfo6.
@bgamari, are there plans to build this like has been done for the
previous ghc-8.4.* releases?

Yes, I can try to get this done tonight.

[Kasama]

any news on this issue? Still experiencing it on Arch Linux

EDIT: installing aur/ncurses5-compat-libs solves the problem for now. So the problem is an incompatibility issue with ncurses 6

[bgamari]

Emanuel Borsboom [e-mail] writes:

Unfortunately there has not yet been a fedora27 bindist released for
ghc-8.4.3, which is needed to support distros the newer libtinfo6.
@bgamari, are there plans to build this like has been done for the
previous ghc-8.4.* releases?

I had troubles with my Fedora 27 build environment and there were no
complaints regarding its absence, so I assumed that there was no demand.

Today I took some time to rebuild my build environment and build 8.4.3
bindists. They are now available at the usual place.

Sorry for the delay!

[borsboom]

Thanks! I think once Stackage LTS 12 was released, which uses GHC 8.4.3, people really noticed that this bindist was missing.

I've added the metadata for this build to Stack's setup metadata, so Stack will now be able to find it on systems with libtinfo6/libncurses6.

@ncaq Please confirm that this works, and close the issue if so.

[ncaq]

Great, I confirmed, I close it.