Fix Cabal 3.0 deprecations

[ulidtko]

Fixes half of #94: specifically, build breakage caused by https://gitlab.haskell.org/ghc/packages/Cabal/commit/3d9a49073d71b2597662a389406a94fcb9b399b2 — some deprecations are finally being removed in Cabal 3.0.0.

[ulidtko]

Travis isn't happy with this:

src/Cabal.hs:48:8:
    Could not find module ‘Distribution.Types.LocalBuildInfo’
    Perhaps you meant
      Distribution.Simple.LocalBuildInfo (from Cabal-1.18.1.5)

... on GHC 7.8 Cabal 1.18, and on stack < lts-10.

Hmmm. That sounds about right, but I'm not sure how to properly reimplement componentNameCLBIs for older Cabal...

[brailsmt]

Any update to this? I just tried stack install hdevtools and got the same error. [1]. I clone the hdevtools repo and updated the base dependency to '4.12.*' and i just successfully built it. I have no idea if that is the right fix as I'm fairly new to haskell.

diff --git a/hdevtools.cabal b/hdevtools.cabal
index 0b2ed6d..f835f15 100644
--- a/hdevtools.cabal
+++ b/hdevtools.cabal
@@ -64,7 +64,7 @@ executable hdevtools
                        Util,
                        Paths_hdevtools
 
-  build-depends:       base == 4.*,
+  build-depends:       base == 4.12.*,
                        cmdargs,
                        directory,
                        filepath,

[1] https://gist.github.com/brailsmt/f1511785d112dd31113114778c016ec2

[ulidtko]

@brailsmt nope, not much progress here on my side.

updated the base dependency to '4.12.*' and i just successfully built it.

Well that's not an update; you've pinned the base to an older version. Since you don't give any of detail on how exactly you built it locally, I'd guess that you ended up using an older GHC, perhaps 8.6.5.

When hdevtools does fail to compile — is with GHC 8.8.*, because it's a major update, they intentionally brake the GHC API (and the Cabal API) between major updates. E.g. removing deprecated stuff, like in this case.

stack lts-15.13 has GHC 8.8.3, and base 4.13.0.0.

So this is certainly not a proper fix for the package; just a workaround-downgrade.

The proper fix would adapt the usage of Cabal and GHC APIs by hdevtools, so that deprecated (and recently removed) functions are not used.

I did attempt some of that — but as you can see, it took too long, and I'd stopped on the tracks. Any help would be appreciated.

[ulidtko]

Here's one helpful table to clarify GHC version issues: https://www.fosskers.ca/en/blog/base