Link failure with cabal haddock, data-files, and annotations.

[Taneb]

In a library with data-files set in the cabal file, if we try to use a function defined in the Paths_* generated module in an {-# ANN module #-} annotation, cabal haddock fails with a hard to understand GHCi linker error.

This is the case with cabal-install 2.2 and 2.4

This gist has an example

[23Skidoo]

Can this be a Haddock bug?

[harpocrates]

Can this be a Haddock bug?

I'll investigate and report back. I fear it might be...

[harpocrates]

Conveniently stumbled across https://ghc.haskell.org/trac/ghc/ticket/14829, which has some useful information. I'm increasingly convinced this bug is related to the flags with which Haddock is invoking GHC. Let's not close this issue just yet though - it might be a case of Cabal passing the right arguments for Haddock to forward to GHC.