Plugin-using packages fail to build with stackage lts 24.11

[shlevy]

See https://github.com/shlevy/h.nix-plugin-error-demo

We have a package with a plugin and another package that uses that plugin. Using cabal.project, this builds fine, using stack.yaml, this fails with:

<no location info>: error:
    Failed to load interface for ‘GHC.Driver.Plugins’.
no unit id matching ‘ghc-9.10.2-inplace’ was found

With the stack-based build, configure flags has:

--dependency=ghc=ghc-9.10.2-CwCnWKm7AFqB0NOBlArzcl

Whereas with the cabal-based build, we have:

--dependency=ghc=ghc-9.10.2-inplace

One suspicious aspect is that we need to set custom configure flags for unix and directory (see commercialhaskell/stackage#7847). But setting those flags for the cabal project does nothing, presumably since all of the affected packages are provided by the compiler; why aren't they provided by the compiler for the stack build?

[shlevy]

The configure flags are a red herring, this happens with LTS 23.28 which does not require any config flag changes.

[shlevy]

Interestingly, lts-22.21 does work with the same h.nix checkout.

[shlevy]

Setting reinstallableLibGhc = false; is a workaround.