needs cabal-install-3.2 to build

[juhp]

I pondered opening a PR against README.md, but anyway just noting that I could only build cabal-diff with cabal-install-3.2 (I tried with both ghc-8.6.5 and ghc-8.8.3), otherwise cabal-install (2.4.1 and 3.0) couldn't resolve the dependencies. :)

cabal-diff is very cool, thanks!!

[fendor]

For me building cabal-extras stuff with cabal-install 3.0 with ghc-8.6.5 on Win 10 and NIXOS 20.04 succeeds.

[juhp]

Just for the record this is what I get with ghc-8.6.5 and cabal-install-3.0:

Resolving dependencies...
cabal-3.0: Could not resolve dependencies:
[__0] trying: base-4.12.0.0/installed-4.1... (user goal)
[__1] trying: binary-0.8.8.0 (user goal)
[__2] next goal: ghc (user goal)
[__2] rejecting: ghc-8.6.5/installed-8.6... (conflict: binary==0.8.8.0, ghc =>
binary==0.8.6.0/installed-0.8...)
[__2] trying: ghc-8.6.5
[__3] rejecting: ghc:-buildable (conflict: base==4.12.0.0/installed-4.1...,
ghc -buildable => base<0)
[__3] rejecting: ghc:+buildable (manual flag can only be changed explicitly)
[__3] fail (backjumping, conflict set: base, ghc, ghc:buildable)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: binary, base, ghc, ghc:buildable
Try running with --minimize-conflict-set to improve the error message.

Anyway feel free to close this if it is not helpful.
I can build fine with 3.2 anyway 👍

[phadej]

@juhp, please do, otherwise this seems to be non-reproducible issue.

[juhp]

I edited and updated my comment.

[phadej]

@juhp

trying: binary-0.8.8.0 (user goal)

is suspicious, where from it comes? Do you have binary-0.8.8.0 in ~/.ghc/x86_64-linux-8.6.5/environments/default (or similar for GHC-8.6.5). Then I think it's a haskell/cabal#6410 which is fixed in cabal-install-3.0.1.0 (which is unreleased) and cabal-install-3.2.

[juhp]

trying: binary-0.8.8.0 (user goal)

is suspicious, where from it comes? Do you have binary-0.8.8.0 in ~/.ghc/x86_64-linux-8.6.5/environments/default (or similar for GHC-8.6.5). Then I think it's a haskell/cabal#6410 which is fixed in cabal-install-3.0.1.0 (which is unreleased) and cabal-install-3.2.

I suspect you are exactly right - not sure how binary-0.8.8.0 would get into my default environment..? (Apparently I also had a newer version of text there).

Anyway thank you!