Stack warning when installing lens

[crockeea]

When using stack to install lens, I get the following warning:

Package lens uses a custom Cabal build, but does not use a custom-setup stanza
Not using the explicit setup deps approach based on configuration
Strongly recommend fixing the package's cabal file

My stack version is Version 1.4.0, Git revision e714f1dd3fade19496d91bd6a017e435a96a6bcd (4640 commits) x86_64 hpack-0.17.0.

[ekmett]

This isn't currently fixable without shutting off users of older versions of cabal.

[ekmett]

You're going to be seeing this unfortunate warning on a lot of my packages for the next couple of years.

[phadej]

In the next version there will be custom-setup stanza, with setup-depends, so it will go away (already fixed in master)

[ekmett]

What is the oldest version of ghc that ships with a cabal that supports custom-setup stanzas?

[phadej]

@ekmett 8.0.x, yet the older Cabal don't care about custom-setup stanzas, they just issue a non-fatal warning (something like "unrecognized stanza"). The similar mechanism let us add benchmark stanzas back then; older Cabals just didn't care about it.

[ekmett]

Speaking of cabal-doctest. Is there an issue with it on 8.2.1?

https://travis-ci.org/ekmett/lens/jobs/227982077#L435

[phadej]

@ekmett yes, I'm waiting for Cabal API to stabilize before I'll fix it. The official tag should be done soon, and there are changes not yet in hvr-ppa version of GHC (e.g. revert of rewriteFile breakage).

I'm not willing to release a cabal-doctest version supporting a version of Cabal which will be never released.

The related ticket in Cabal: haskell/cabal#3576 (comment)

[RyanGlScott]

As @phadej noted, you won't get this warning on a sufficiently recent Stackage resolver (e.g., nightly-2017-06-11, which I tested), since it contains a lens with a custom-setup stanza.

We've done our part here, so I'll close this.