support for foreign library artifacts (cabal 'foreign-library' stanza)

[aztecrex]

This capability would allow us to easily configure shared native library output with hpack.

[sol]

Yes, absolutely! PRs accepted!

BTW, do you know when this was added to Cabal? I didn't find anything in the docs at https://www.haskell.org/cabal/users-guide/developing-packages.html#foreign-libraries. We need to know this to set the cabal-version accordingly.

[koflerdavid]

According to the changelog, it was added in v2.0.0.2.

[flip111]

https://qnikst.github.io/posts/2018-05-02-cabal-foreign-library.html

i would like the feature too

[sol]

For what it's worth, for the time being it should be possible to use verbatim to add foreign libraries to a package.yaml file.

[isovector]

I'd like this feature too!

[Krantz-XRF]

I would love to work on this, but I had never dive into the source code of HPack. Can someone give me a big picture of which part of HPack is relevant, and perhaps which part should be modified?

[minimapletinytools]

I wrote a demo of foreign-library feature here: https://github.com/pdlla/haskell-ffi-cabal-foreign-library-examples it works with stack too but you need to write your own .cabal file (see stack branch, which will get merged eventually).

I'd definitely love this feature for hpack :).

[ropwareJB]

PR for a basic attempt at this feature: #518