Add some release notes for things we did
Change-Id: If0ddec6b64a43c3d8f6cae39e0292863f3b49401
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doc/manual/rl-next/nix-copy-is-fast.md
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doc/manual/rl-next/nix-copy-is-fast.md
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---
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synopsis: "`nix copy` is now several times faster at `querying info about /nix/store/...`"
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cls: [1462]
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issues: [fj#366]
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credits: [jade]
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category: Fixes
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---
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We fixed a locking bug that serialized `querying info about /nix/store/...`
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onto just one thread such that it was eating `O(paths to copy * latency)` time
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while setting up to copy paths to s3 and other stores. It is now `nproc` times
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faster.
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doc/manual/rl-next/old-protocol-removal.md
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doc/manual/rl-next/old-protocol-removal.md
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---
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synopsis: "Lix no longer speaks the Nix remote-build worker protocol to clients or servers older than CppNix 2.3"
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cls: [1207, 1208, 1206, 1205, 1204, 1203, 1479]
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issues: [fj#325]
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credits: [jade]
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category: Breaking Changes
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---
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CppNix 2.3 was released in 2019, and is the new oldest supported version. We
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will increase our support baseline in the future up to a final version of CppNix
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2.18 (which may happen soon given that it is the only still-packaged and thus
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still-tested >2.3 version), but this step already removes a significant amount
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of dead, untested, code paths.
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Lix speaks the same version of the protocol as CppNix 2.18 and that fact will
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never change in the future; the Lix plans to replace the protocol for evolution
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will entail a complete incompatible replacement that will be supported in
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parallel with the old protocol. Lix will thus retain remote build compatibility
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with CppNix as long as CppNix maintains protocol compatibility with 2.18, and
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as long as Lix retains legacy protocol support (which will likely be a long
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time given that we plan to convert it to a frozen-in-time shim).
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doc/manual/rl-next/sanitizers.md
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doc/manual/rl-next/sanitizers.md
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---
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synopsis: "Lix now supports building with UndefinedBehaviorSanitizer"
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cls: [1483]
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credits: [jade]
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category: Development
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---
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You can now build Lix with the configuration option `-Db_sanitize=undefined` and it will both work and pass tests. AddressSanitizer support is also coming soon.
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For a list of undefined behaviour fixed by sanitizer usage, see [the gerrit topic "undefined-behaviour"](https://gerrit.lix.systems/q/topic:%22undefined-behaviour%22).
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