shellcheck @0.9.0: Error: cabal: Could not resolve dependencies

[breiter (Brian Reiter)]

After a bit of a struggle to get GHC to install (#68302) I ran into another problem where shellcheck build fails because cabal cannot build with cabal, which is the default variant.

Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: ShellCheck-0.9.0 (user goal)
[__1] next goal: transformers (dependency of ShellCheck)
[__1] rejecting: transformers-0.6.1.0/installed-0.6.1.0 (conflict: ShellCheck
=> transformers>=0.4.2 && <0.6)
[__1] skipping: transformers-0.6.1.1, transformers-0.6.1.0,
transformers-0.6.0.6, transformers-0.6.0.2 (has the same characteristics that
caused the previous version to fail: excluded by constraint '>=0.4.2 && <0.6'
from 'ShellCheck')
[__1] trying: transformers-0.5.6.2
[__2] trying: regex-tdfa-1.3.2.2 (dependency of ShellCheck)
[__3] trying: text-2.0.2/installed-2.0.2 (dependency of regex-tdfa)
[__4] trying: base-4.18.0.0/installed-4.18.0.0 (dependency of ShellCheck)
[__5] next goal: aeson (dependency of ShellCheck)
[__5] rejecting: aeson-2.2.0.0 (conflict: ShellCheck => aeson>=1.4.0 && <2.2)
[__5] trying: aeson-2.1.2.1
[__6] trying: semialign-1.3 (dependency of aeson)
[__7] trying: semialign:+semigroupoids
[__8] next goal: semigroupoids (dependency of semialign +semigroupoids)
[__8] rejecting: semigroupoids-6.0.0.1 (conflict: transformers==0.5.6.2,
semigroupoids => transformers>=0.6.1.0 && <0.7)
[__8] rejecting: semigroupoids-5.3.7, semigroupoids-5.3.6 (conflict: text =>
base==4.18.0.0/installed-4.18.0.0, semigroupoids => base>=4.3 && <4.18)
[__8] rejecting: semigroupoids-5.3.5, semigroupoids-5.3.4 (conflict: text =>
base==4.18.0.0/installed-4.18.0.0, semigroupoids => base>=4.3 && <4.16)
[__8] rejecting: semigroupoids-5.3.3, semigroupoids-5.3.2 (conflict: text =>
base==4.18.0.0/installed-4.18.0.0, semigroupoids => base>=4.3 && <4.15)
[__8] rejecting: semigroupoids-5.3.1, semigroupoids-5.2.2,
semigroupoids-5.2.1, semigroupoids-5.2, semigroupoids-5.1,
semigroupoids-5.0.1, semigroupoids-5.0.0.4, semigroupoids-5.0.0.3,
semigroupoids-5.0.0.2, semigroupoids-5.0.0.1, semigroupoids-5,
semigroupoids-4.3, semigroupoids-4.2, semigroupoids-4.0.4,
semigroupoids-4.0.3, semigroupoids-4.0.2.1, semigroupoids-4.0.2,
semigroupoids-4.0.1, semigroupoids-4.0, semigroupoids-3.1,
semigroupoids-3.0.3, semigroupoids-3.0.2, semigroupoids-3.0.1,
semigroupoids-3.0.0.2, semigroupoids-3.0.0.1, semigroupoids-3.0,
semigroupoids-1.3.4, semigroupoids-1.3.3, semigroupoids-1.3.2.1,
semigroupoids-1.3.2, semigroupoids-1.3.1.2, semigroupoids-1.3.1.1,
semigroupoids-1.3.1, semigroupoids-1.3, semigroupoids-1.2.6.2,
semigroupoids-1.2.6.1, semigroupoids-1.2.6, semigroupoids-1.2.5,
semigroupoids-1.2.4, semigroupoids-1.2.2.4, semigroupoids-1.2.2.3,
semigroupoids-1.2.2.2, semigroupoids-1.2.2.1, semigroupoids-1.2.2,
semigroupoids-1.2.1, semigroupoids-1.2.0, semigroupoids-1.1.3,
semigroupoids-1.1.2, semigroupoids-1.1.1, semigroupoids-1.1.0,
semigroupoids-1.0.0 (conflict: semialign +semigroupoids =>
semigroupoids>=5.3.2 && <6.1)
[__8] rejecting: semigroupoids-6 (conflict: text =>
base==4.18.0.0/installed-4.18.0.0, semigroupoids => base>=4.9 && <4.18)
[__8] rejecting: semigroupoids-5.3, semigroupoids-4.5 (conflict: semialign
+semigroupoids => semigroupoids>=5.3.2 && <6.1)
[__8] fail (backjumping, conflict set: semialign, semigroupoids, text,
transformers, semialign:semigroupoids)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: aeson, ShellCheck, text, base,
semigroupoids, semialign, semialign:semigroupoids, regex-tdfa, transformers
Try running with --minimize-conflict-set to improve the error message.

​https://github.com/koalaman/shellcheck/issues/2734

The problem is that the ghc version that is bundled with macports is newer than the 0.90 tag of shellcheck was designed to build with.

This patch from main will fix the constraints for cabal to ghc 9.6.1:

​https://github.com/koalaman/shellcheck/commit/b3932dfa10804434fb8c15dc32e428c5a1c3bfa4

Otherwise maybe the +stack variant should be default.

[neverpanic (Clemens Lang)]

Fixed in [9fa3e2436be1e31c1d43439ca2c69bd82ee14eea/macports-ports].