Special case for dependency mismatch on wired-in packages · commercialhaskell/stack#2696

(0 comments) (1 reaction) (0 assignees)Haskell (4,060 stars) (848 forks)batch import

awaiting pull requestcomponent: output (UI/UX)help wanted

Description

In https://github.com/commercialhaskell/stack/issues/2553 , there is the following output:

In the dependencies for haddock-issue-0.1.0.0:
    base must match >=4.7 && <5, but the stack configuration has no specified version (latest applicable is 4.9.0.0)

Recommended action: try adding the following to your extra-deps in /home/simon/tmp/haddock-issue/stack.yaml:
- base-4.9.0.0

For wired-in packages, it would be good to suggest changing ghc version. For base versions, we could even consider hardcoding an association between base versions and ghc versions. This way, a different selection of compiler can be suggested as a possible "Recommended action"

Contributor guide

Tech stack: None
Domain: build system
Issue type: feature
Difficulty: 3
Estimated time: half day
Activity status: stale
Clarity: mostly clear
Prerequisites: Familiarity with Stack dependency resolution
Newbie friendliness: 40
Research direction: Investigate how Stack currently handles dependency mismatches for wired in packages like base. Look at the error output and the recommendation algorithm in the Stack codebase, likely in modules related to dependency solving or snapshot handling. Consider associating base versions with GHC versions to suggest a compiler upgrade instead of adding extra deps. The issue references #2553 for context; reviewing that issue and the linked code will help understand the current behavior.