| 26 Feb 2026 |
 Randy Eckenrode | Anyone tried switching the default LLVM to LLVM 22 to see what breaks on Darwin? | 02:11:56 |
 alexfmpe | what is needed?
I tried doing llvmPackages = llvmPackages_22; and it broke eval | 03:11:24 |
| alexfmpe | error: assertion '(allDeps isBuiltByBootstrapFilesCompiler [ ((stage1Packages prevStage)) ((darwinPackages prevStage)) ((llvmLibrariesDeps prevStage)) ((llvmToolsDeps prevStage)) ((sdkPackages prevStage)) ((sdkDarwinPackages prevStage)) ])' failed | 03:11:34 |
| alexfmpe | in https://github.com/NixOS/nixpkgs/pull/493742 | 03:11:55 |
| Randy Eckenrode | You need to update the Darwin stdenv’s LLVM version. | 03:11:55 |
| Randy Eckenrode | There’s a comment at the top. | 03:12:11 |
| Randy Eckenrode | It’s necessary to make sure
overrides work right. | 03:12:25 |
| alexfmpe | oh derp, I kept searching for stray llvmPackages_21 | 03:13:10 |
| alexfmpe | can't we lib.versions.major llvm.version instead? | 03:14:21 |
| alexfmpe | * can't we llvmVersion = lib.versions.major llvm.version instead? | 03:14:43 |
| Randy Eckenrode | We don’t have a package set at that point, and we can’t get the version in the stage for obvious reasons. | 03:14:59 |
| Randy Eckenrode | llvm is llvmPackages.llvm, which is llvmPackages_XX.llvm. Trying to overlay llvmPackages_${lib.versions.major llvm.version} will cause an infinite recursion. | 03:17:07 |
| Randy Eckenrode | It worked before because the stdenv did it backwards. It defined the overlay for the unversioned llvmPackages then added a versioned one at the end. | 03:18:16 |
| Randy Eckenrode | But that’s not how the package sets are defined normally. | 03:18:58 |
| alexfmpe | welp, 300 rebuilds just for hello | 03:19:13 |
| alexfmpe | also doing ispc and ghc | 03:19:19 |
| alexfmpe | going to leave it overnight, anything else interesting to try? | 03:19:25 |
| Randy Eckenrode | Something using Boost? Chromium or Qt Web Engine. | 03:19:56 |
| Randy Eckenrode | Maybe Node. | 03:20:05 |
| alexfmpe | huh I see 2 llvm 22 in the dep chain, that expected? | 03:20:29 |
| Randy Eckenrode | Yes. | 03:20:41 |
| Randy Eckenrode | First one is built with the bootstrap tools. Second one is rebuilt with Clang 22. | 03:21:10 |
| Randy Eckenrode | At least the LLVM tests are only tun once. | 03:22:04 |
| Randy Eckenrode | * | 03:22:13 |
| Randy Eckenrode | Second one also has dependencies built by Clang 22 and not the bootstrap tools. | 03:23:27 |
| alexfmpe | hmm building llvm_22 with 21 as default yields https://github.com/NixOS/nixpkgs/pull/493742#issuecomment-3960673424 | 03:23:31 |
| alexfmpe | should I try 22.1.0-rc3 with 21, or 22 with 22 | 03:23:56 |
| alexfmpe | guess the later | 03:24:07 |
| alexfmpe | hope it doesn't hit the same test failure | 03:24:22 |
| Randy Eckenrode | IIRC some new tests aren’t getting DYLD_LIBRARY_PATH set up to find the required dylibs in the build folder instead of in $lib. | 03:24:52 |
