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manual: document deprecated minimumOCamlVersion

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Vincent Laporte 2022-01-19 11:16:45 +01:00 committed by Vincent Laporte
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1 changed files with 11 additions and 3 deletions
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doc/languages-frameworks/ocaml.section.md
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@ -32,9 +32,9 @@ Given that most of the OCaml ecosystem is now built with dune, nixpkgs includes
Here is a simple package example. Here is a simple package example.
- It defines an (optional) attribute `minimalOCamlVersion` that will be used to - It defines an (optional) attribute `minimalOCamlVersion` (see note below)
throw a descriptive evaluation error if building with an older OCaml is that will be used to throw a descriptive evaluation error if building with
attempted. an older OCaml is attempted.
- It uses the `fetchFromGitHub` fetcher to get its source. - It uses the `fetchFromGitHub` fetcher to get its source.
@ -117,3 +117,11 @@ buildDunePackage rec {
}; };
} }
``` ```
Note about `minimalOCamlVersion`. A deprecated version of this argument was
spelled `minimumOCamlVersion`; setting the old attribute wrongly modifies the
derivation hash and is therefore inappropriate. As a technical dept, currently
packaged libraries may still use the old spelling: maintainers are invited to
fix this when updating packages. Massive renaming is strongly discouraged as it
would be challenging to review, difficult to test, and will cause unnecessary
rebuild.