Help build gi-gtk

[nishanthkarthik]

Describe the bug
I am not able to build @stackage//:gi-gtk. I am not sure what I am doing wrong here. Any help is appreciated :)

To Reproduce

rules_haskell_toolchains(
    version = "8.10.7",
)

stack_snapshot(
    name = "stackage",
    packages = [
        "base",
        "random",
        "mtl",
        "gi-gtk",
        "haskell-gi-base",
    ],
    verbose = True,
    snapshot = "lts-18.18",
    stack_snapshot_json = "//tooling:stackage_snapshot.json",
)

Running bazel build @stackage//:gi-gtk errors out

ERROR: /home/x/.cache/bazel/x/598407688b5c09d02ba743fe2c7b1b19/external/stackage/BUILD.bazel:492:22: output 'external/stackage/haskell-gi-overloading-1.0/_install/lib/libHShaskell-gi-overloading-1.0.a' was not created
ERROR: /home/x/.cache/bazel/x/598407688b5c09d02ba743fe2c7b1b19/external/stackage/BUILD.bazel:492:22: output 'external/stackage/haskell-gi-overloading-1.0/_install/haskell-gi-overloading-1.0_haddock/haskell-gi-overloading.haddock' was not created
ERROR: /home/x/.cache/bazel/x/598407688b5c09d02ba743fe2c7b1b19/external/stackage/BUILD.bazel:492:22: output 'external/stackage/haskell-gi-overloading-1.0/_install/lib/libHShaskell-gi-overloading-1.0-ghc8.10.7.so' was not created
ERROR: /home/x/.cache/bazel/x/598407688b5c09d02ba743fe2c7b1b19/external/stackage/BUILD.bazel:492:22: HaskellCabalLibrary @stackage//:haskell-gi-overloading failed: not all outputs were created or valid

Expected behavior
Building gi-gtk should finish. I am not sure if I am building this package correctly with rules_haskell.

Environment

• OS name + version: ArchLinux
• Bazel version: 5.1.1
• Version of the rules: a7241fa

[avdv]

It seems haskell-gi-overloading is a bit weird library since it contains no source files as it is only used as a marker to enable / disable overloading. Hence cabal does not build any libraries which is something rules_haskell relies on.

You could work around that by replacing the library with your own version using the vendored_packages attribute for stack_snapshot. If you still need help with this (after all this time), just write here and I can fill in more details.

[aherrmann]

@avdv Thanks for looking into this. IIUC this means that that package would belong into the empty packages list:

rules_haskell/haskell/cabal.bzl

Line 129 in 267933e

# Some old packages are empty compatibility shims. Empty packages

Does that make sense?

[avdv]

Oh, yes. Thank you, @aherrmann that looks like a sensible thing to do. I'll prepare a PR.