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Nix on macOS

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29 Jan 2026
@eveeifyeve:matrix.orgeveeifyeveKnown issue: https://github.com/NixOS/nix/issues/1167610:38:24
@eveeifyeve:matrix.orgeveeifyeve* That is a known issue.10:39:08
@eveeifyeve:matrix.orgeveeifyeve* That is a known issue, no fix unfortantly.10:39:16
@eveeifyeve:matrix.orgeveeifyeveAlso what is the solution for multiple installations on nix-darwin where it installs a separate nix.10:45:36
@eveeifyeve:matrix.orgeveeifyeve* Also what is the solution for multiple installations on nix-darwin where it installs a separate nix?10:45:42
@eveeifyeve:matrix.orgeveeifyeve* Also what is the solution for multiple installations on nix-darwin, where it installs a separate nix?10:45:50
@eveeifyeve:matrix.orgeveeifyeve

Because at the moment I have one that is really old that I want to remove.

[FAIL] Multiple versions of nix found in PATH:
  "/nix/store/6dw415pr1q4h1lywp3y0z6zij7h9wrsf-nix-2.31.2/bin"
  "/nix/store/c20m7jl3x7a951sakyyfwngaxvlw7s63-nix-2.28.3/bin"
10:48:35
@eveeifyeve:matrix.orgeveeifyeve *

Because at the moment I have one that is really old that I want to remove, which is used by default.

[FAIL] Multiple versions of nix found in PATH:
  "/nix/store/6dw415pr1q4h1lywp3y0z6zij7h9wrsf-nix-2.31.2/bin"
  "/nix/store/c20m7jl3x7a951sakyyfwngaxvlw7s63-nix-2.28.3/bin"
10:49:21
@eveeifyeve:matrix.orgeveeifyeveNvm this is a quick and really easy fix.10:58:48
@reckenrode:matrix.orgRandy Eckenrode My branch uses staging as a base, so it (almost always) does a full bootstrap from source. 11:35:26
@reckenrode:matrix.orgRandy Eckenrode sudo -i nix-env -e nix IIRC. 11:36:26
@reckenrode:matrix.orgRandy EckenrodeUsually the Nix from the installer is left in root’s profile, but you don’t need it if your Nix is managed by nix-darwin.11:37:06
@eveeifyeve:matrix.orgeveeifyeveYeah so I removed it..11:37:23
@eveeifyeve:matrix.orgeveeifyeveNix-darwin should create a first install script that uninstalls the one from the installer.11:38:16
@eveeifyeve:matrix.orgeveeifyeveWe ❤️ llvm taking the longest to build in staging....11:46:02
@eveeifyeve:matrix.orgeveeifyeve* We ❤️ llvm taking the longest to build in staging.... 😆11:46:11
@eveeifyeve:matrix.orgeveeifyeve Randy Eckenrode: You were right I feel it does take 11 hours. I am at 6 hours and it's not built yet. 13:14:57
@eveeifyeve:matrix.orgeveeifyeveIt's hit to the point of the swift-cxx-bootrap (buildphase)13:15:18
@eveeifyeve:matrix.orgeveeifyeve Don't recommend anyone trying to build swift 6, but I am because I want to help out Randy Eckenrode. 13:36:22
@reckenrode:matrix.orgRandy Eckenrode The biggest help will be testing. Try building packaged Swift applications as well as ones in a dev shell. It should work. The goal is to make it a good experience for packaging and for local development. 13:43:13
@reckenrode:matrix.orgRandy EckenrodeIf there are packages that need things that have been drops, I want to know, so I can investigate why.13:43:37
@reckenrode:matrix.orgRandy Eckenrode For example, swift.swift is gone. Were you just doing that to get an unwrapped compiler? 13:44:07
@reckenrode:matrix.orgRandy EckenrodeThe compiler is now unwrapped.13:44:29
@reckenrode:matrix.orgRandy EckenrodeUsing xcbuild with Swift dependencies? I want to make that work.13:45:21
@reckenrode:matrix.orgRandy Eckenrode Using NIX_SWIFTFLAGS_COMPILE? It’s no longer supported due to Swift being unwrapped. How was that being used? 13:46:15
@reckenrode:matrix.orgRandy EckenrodeNeed to link non-Swift dylibs? Does that still work?13:46:35
@reckenrode:matrix.orgRandy Eckenrode If there are easy test cases, they can be put in passthru.tests. I’ve already updated the C++ interop test for both-way interop. 13:47:30
@reckenrode:matrix.orgRandy EckenrodeWe can now use Swift from C++ in addition to C++ from Swift.13:48:02
@reckenrode:matrix.orgRandy EckenrodeOther bonus things I hope will work is cross-compilation and using stdlibs for other targets.13:48:37
@reckenrode:matrix.orgRandy EckenrodeStatic is another one that needs testing.13:49:48

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