Add "lib" as an available comptype

[tfausak]

No description provided.

[tfausak]

Wait... I'm not sure this does what I think it does. My goal is to build only the library -- not any executables. Is this the right way to do that?

[mgsloan]

@tfausak Unfortunately, it doesn't quite work - see #3653

Makes sense to document pkg:lib here, but note that there is no pkg:lib:something-else

[tfausak]

Ah, gotcha.

Will pkg:lib:blah work with Cabal 2's multiple libraries per package idea?

[mgsloan]

Perhaps so! I don't think that's plumbed through stack quite yet

EDIT: nvm, it exists - #3361 - but no ability to specifically build just one internal library I think.

[decentral1se]

I think this all boils down to haskell/cabal#2780!? Nice maze there ... not sure I made it out the right way. If that is the blocking issue, should we close here and move over to a ticket to track when this will be possible?

[mgsloan]

Tracked by #3486 . It sounds like some form of per component build is possible with Cabal 2.0, but how to do that and how it will affect efficiency is unclear.