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builtins: fix builtins.langVersion docs to state it's deprecated

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This builtin was always a problem and nixpkgs uses it in exactly one
place, to give up if the Nix version is absurdly old. It has no other
use cases, and doesn't work in a multi-implementation world anyway.

Change-Id: I03c36e118591029e2ef14b091fe14a311c66a08a
This commit is contained in:
Jade Lovelace
2024-05-15 21:54:12 -07:00
parent 7cfaf057e3
commit 6d84d6bdc1
2 changed files with 29 additions and 14 deletions
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doc/manual/rl-next/nixversion-fake.md
+9 -5
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@@ -1,13 +1,17 @@
---
synopsis: "`builtins.nixVersion` now returns a fixed value \"2.18.3-lix\""
cls: 558
synopsis: "`builtins.nixVersion` and `builtins.langVersion` return fixed values"
cls: [558, 1144]
credits: jade
category: Breaking Changes
---
`builtins.nixVersion` now returns a fixed value `"2.18.3-lix"`. This prevents
feature detection assuming that features that exist in Nix post-Lix-branch-off
might exist, even though the Lix version is greater than the Nix version.
`builtins.nixVersion` now returns a fixed value `"2.18.3-lix"`.
`builtins.langVersion` returns a fixed value `6`, matching CppNix 2.18.
This prevents feature detection assuming that features that exist in Nix
post-Lix-branch-off might exist, even though the Lix version is greater than
the Nix version.
In the future, check for builtins for feature detection. If a feature cannot be
detected by *those* means, please file a Lix bug.