Support Bazel 7

[avdv]

After #2117, since Bazel and the project dependencies use separate nixpkgs revisions, this adds support for Bazel 7.

Supersedes #2107

[avdv]

@mergifyio rebase

[mergify[bot]]

rebase

✅ Branch has been successfully rebased

[avdv]

Currently, rules_haskell_tests are failing on MacOS using nixpkgs:

1. https://app.buildbuddy.io/invocation/300047f3-2d31-44d6-9d75-5d9ca4783b4f
2. https://app.buildbuddy.io/invocation/5765ca58-0c3d-441b-8104-c9c09585cd19
3. https://app.buildbuddy.io/invocation/74d80558-c7a7-4838-aac4-3d8c63907695
4. https://app.buildbuddy.io/invocation/7af7ebe8-9e34-41ed-a7ec-ceb23d0baa34

The tests that fail are:

1. //tests/recompilation:recompilation_test_nixpkgs_bazel_7
2. //tests/repl-targets:hs_lib_repl_test_nixpkgs_bazel_7

The latter fails with:

       INFO: Running command line: bazel-bin/hs-lib@repl@repl -ignore-dot-ghci -e 'show (foo 10) ++ bar ++ baz ++ gen'
       <command line>: User-specified static library could not be loaded (/private/var/tmp/_bazel_runner/6f93c0710d32c05eb86fd5414239ece6/f463254a63c950347e0840a543f8ccec/execroot/_main//bazel-out/darwin_x86_64-fastbuild/bin/libourclibrary.a)
       Loading static libraries is not supported in this configuration.
       Try using a dynamic library instead.

This seems to be due to an internal change of the cc_rules. With Bazel 6, a dynamic library was built, but with Bazel 7 a static one is produced.

Trying to switch from cc_library to cc_shared_library should make this work, but we do not yet handle this type of library in rules_haskell since we expect C libraries to have a CcInfo provider which the cc_shared_library does not provide.

[malt3]

The root cause has been found and will be fixed by https://github.com/bazelbuild/bazel/pull/23438 at some point. Now working on a temporary workaround in rules_nixpkgs.

[malt3]

It looks like this feature was removed on purpose. I think we should add a dynamic_deps attribute to haskell_library that expects a label with CcSharedLibraryInfo provider. I can take a stab at this.

[malt3]

The support for cc_shared_library is now in draft state in #2232.

[malt3]

Superseded by #2232