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Haskell: Difference between revisions
Note about IFD
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When using <code>cabal2nix</code>, Nix does not pull a cabal package by respecting the constraint specified in the cabal file (see [https://github.com/chrissound/Cabal2NixLimitationExample example]). Issue is discussed [https://stackoverflow.com/questions/57441156/pulling-in-specific-haskell-packages-cabal-dependencies-with-nix here]. You should be using `callCabal2nix` anyway. | When using <code>cabal2nix</code>, Nix does not pull a cabal package by respecting the constraint specified in the cabal file (see [https://github.com/chrissound/Cabal2NixLimitationExample example]). Issue is discussed [https://stackoverflow.com/questions/57441156/pulling-in-specific-haskell-packages-cabal-dependencies-with-nix here]. You should be using `callCabal2nix` anyway. | ||
== IFD and Haskell == | |||
<code>callCabal2nix</code>, which is implicitly used for building Haskell projects, uses IFD.[https://github.com/NixOS/templates/issues/28][https://discourse.nixos.org/t/another-simple-flake-for-haskell-development/18164/6]. This means that since IFD is disabled by default in certain nix commands,[https://github.com/NixOS/nix/pull/5253] the following commands will be broken for Haskell projects whose flake output specifies multiple system attributes: | |||
* <code>nix flake show</code> | |||
* <code>nix flake check</code> | |||
[[Category:Languages]] | [[Category:Languages]] | ||
[[Category:Applications]] | [[Category:Applications]] | ||