Cabal Stuck On Installing Package Failure

[dtheras]

Issue

I attempted to install 'hakyll' library package but cabal failed (banal - the package is out of date - submitted a pr).

cabal install --lib hakyll

HOWEVER, now attempting to install any other library produces the failed-to-install-hakyll message (see below).

cabal install --lib process
cabal install --lib yesod-core
cabal install --lib lifted-base

All three commands produce identical "failed to install hakyll" message, which is erroneous since obviously none of these depend on hakyll. I have never seen this behavior before.

Notes

• Using new-install produces the same message about failing to install hakyll.
• Attempting 'cabal install (package)' succeeds, but the follow up 'cabal install --lib (package)' still fails with the same hakyll warning.
• Working directory is not in any folder with a cabal file. I've attempted the three lines in 4 different locations with identical results.

System

I am on recent macOS Catalina with the current ghc-8.10.1 / cabal-3.2.0.0

Banal failed to install hakyll message:

Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: base-4.14.0.0/installed-4.14.0.0 (user goal)
[__1] trying: ghc-8.10.1/installed-8.10.1 (user goal)
[__2] next goal: hakyll (user goal)
[__2] rejecting: hakyll-4.13.4.0 (conflict: ghc =>
template-haskell==2.16.0.0/installed-2.16.0.0, hakyll =>
template-haskell>=2.14 && <2.16)
[__2] rejecting: hakyll-4.13.3.0, 
....
[__2] fail (backjumping, conflict set: ghc, hakyll)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: hakyll, ghc, base

[fgaz]

cabal install --lib has some problems handling subsequent installations at the moment, see #5559

If you really need to install them, try removing the default environment file (~/.ghc/<arch>-<version>/environments/default) and then installing them all together instead (cabal install --lib hakyll process yesod-core lifted-base). Or you could try @phadej's cabal-env, which is a prototype of a future cabal env command (#6841).

By the way, what is your use case for globally installing those libraries? Your needs might be served better by making a cabal package and putting those libraries in the build depends field (isolated and declarative)

[gbaz]

closing in favor of the above linked ticket.