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Add cabal-paths patch for ghc 9.2.x #216857

Merged
merged 3 commits into from
Mar 11, 2023
Merged

Add cabal-paths patch for ghc 9.2.x #216857

merged 3 commits into from
Mar 11, 2023

Commits on Mar 10, 2023

  1. haskell.compiler.ghc{8107,902}: give cabal-paths.patch a better name

    @sternenseemann
    sternenseemann committed Mar 10, 2023
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  2. haskellPackages.regex-rure: mark broken on aarch64-darwin

    @sternenseemann
    sternenseemann committed Mar 10, 2023
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  3. haskell.compiler.ghc9*: work around output cycles on aarch64-darwin 

    Due to link time dead code elimination not working on aarch64-darwin,
some unused store path references in Paths_* modules are retained. This
causes reference cycles when a separate `bin` output is used.

To prevent this, add a patch to Cabal as shipped by GHC which infers
based on the installation layout (which is influenced by
enableSeparateBinOutput, enableSeparateDataOutput etc. in a Nix build)
which references can be retained without causing a reference cycle. This
ensures that packages that were fine with a bin output will also work on
aarch64-darwin. Packages that cause a reference cycle anyways (by
actually using references that do cause one) fail due to a missing
symbol – here we are trading the overall benefit for a more confusing
error message.

For details, refer to the explanation comment in the patch.
    @sternenseemann
    sternenseemann committed Mar 10, 2023
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