Executables are not used in build-tool-depends if the library is obtained via haskell.nix

[MangoIV]

Describe the bug

When trying to use
build-tool-depends: markdown-unlit:markdown-unlit

I get

plutarch-docs:markdown-unlit:exe.markdown-unlit-0.5.1/installed-4CgIbMeCiwSElzbwyyhikO
(does not contain executable 'markdown-unlit', which is required by my-library *test)

Which is wrong.

• Build system: x86_64-linux
• GHC version: 924
• Haskell.nix version: 5eccdb523

Steps To Reproduce

add the following to your cabal file:

  ghc-options: -pgmL markdown-unlit

  build-depends:
    , base
    , markdown-unlit

  build-tool-depends: markdown-unlit:markdown-unlit

Expected behavior

cabal manages to resolve the executable

Additional context

This is probably related to another issue I opened, #1662. Also related:
haskell/cabal#8481
IntersectMBO/cardano-node#4455
#839

This doesn't happen in the testcases in haskell.nix (like test/shell-for) because the dependencies are not resolved via haskell.nix but locally via cabal.

This is a huge issue causing all sorts of ugly hacks in practice.

[ParetoOptimalDev]

Allso see #839

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[ScottFreeCode]

There are some other issues that might have the same underlying cause, here: https://gist.github.com/ScottFreeCode/ef9f254e2dd91544bba4a068852fc81f