| 12 Nov 2025 |
 Randy Eckenrode | Redacted or Malformed Event | 22:06:55 |
| Randy Eckenrode | * | 22:08:29 |
 niklaskorz | hm do I understand correctly that Apple clang was already prio 1 and that LLVM clang refers to the non-Xcode variant? | 22:16:11 |
| Randy Eckenrode | I think so. I don’t know how Homebrew handles specifying a compiler where Xcode doesn’t work. I can’t think of a situation where you would want to use upstream clang in lieu of Xcode if you actually have access to Xcode. | 22:17:36 |
| Randy Eckenrode | Maybe to use some other libc++, but Xcode clang can probably use it. | 22:17:54 |
| 13 Nov 2025 |
 samasaur | newer language features, right? | 00:10:26 |
| Randy Eckenrode | Apple’s Clang is not that far behind upstream. | 00:18:42 |
| samasaur | Yeah i think that is rarely a long-term issue but I remember it being necessary for btop in macports | 00:30:58 |
| Randy Eckenrode | btop needed libc++ features that weren’t available until LLVM 16. | 00:33:04 |
|  tao joined the room. | 05:27:51 |
| tao | Hi I've been trying to debug an llvm build failure on macOS with a maintainer of the llvm package over on the nixpkgs GitHub repo. They insist the build failure is a result of an older nixpkgs I must be running but my flake pins nixpkgs to unstable. They suggested I pop over here to see if the community can help me. Here's the GitHub issue where we talk through the causes: https://github.com/NixOS/nixpkgs/issues/460725#issuecomment-3523848126 and here's my repo: https://github.com/worldofgeese/fleek-nix-darwin | 05:31:12 |
| niklaskorz | What Tristan was asking for in that issue is that you reduce the config to a very small one that still fails | 09:39:56 |
| niklaskorz | It definitely is too much to expect from mantainers to build a 9gb darwin config to troubleshoot this issue | 09:40:19 |
| niklaskorz | (but I'm doing it right now nonetheless, which is why I know the size in the first place) | 09:40:51 |
| niklaskorz | * It definitely is too much to expect from maintainers to build a 9gb darwin config to troubleshoot this issue | 09:42:11 |
| niklaskorz | so yeah, it's your config, not an issue with nixpkgs | 09:48:09 |
| niklaskorz | why did you add these in the first place:
nix.enable = false;
nixpkgs.hostPlatform = {
config = "aarch64-apple-darwin";
system = "aarch64-darwin";
};
| 09:49:15 |
| niklaskorz | aarch64-apple-darwin is the wrong host triple | 09:49:23 |
| niklaskorz | the correct one is arm64-apple-darwin | 09:49:31 |
| niklaskorz | but honestly just delete this entirely | 09:49:35 |
| niklaskorz | there is no reason to set this | 09:49:38 |
 purrtner | Hi Ben, sorry for taking so long to respond. It seems, there has been an upstream change, that fixed the issue.
The error was this one:
Local evaluation for computing rebuilds
$ nix-env --extra-experimental-features no-url-literals --option system aarch64-darwin -f <nixpkgs> --nix-path nixpkgs=/Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs nixpkgs-overlays=/private/tmp/nix-shell-1673-462192242/tmpa3pj3v9z -qaP --xml --out-path --show-trace --no-allow-import-from-derivation
error:
… while querying the derivation named 'flutter-wrapped-3.29.3-sdk-links'
… while calling the 'getAttr' builtin
at <nix/derivation-internal.nix>:50:17:
49| value = commonAttrs // {
50| outPath = builtins.getAttr outputName strict;
| ^
51| drvPath = strict.drvPath;
… while calling the 'derivationStrict' builtin
at <nix/derivation-internal.nix>:37:12:
36|
37| strict = derivationStrict drvAttrs;
| ^
38|
… while evaluating derivation 'flutter-wrapped-3.29.3-sdk-links'
whose name attribute is located at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:544:13
… while evaluating attribute 'buildCommand' of derivation 'flutter-wrapped-3.29.3-sdk-links'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/build-support/trivial-builders/default.nix:80:17:
79| enableParallelBuilding = true;
80| inherit buildCommand name;
| ^
81| passAsFile = [ "buildCommand" ] ++ (derivationArgs.passAsFile or [ ]);
… while calling the 'getAttr' builtin
at <nix/derivation-internal.nix>:50:17:
49| value = commonAttrs // {
50| outPath = builtins.getAttr outputName strict;
| ^
51| drvPath = strict.drvPath;
… while calling the 'derivationStrict' builtin
at <nix/derivation-internal.nix>:37:12:
36|
37| strict = derivationStrict drvAttrs;
| ^
38|
… while evaluating derivation 'flutter-3.29.3-unwrapped'
whose name attribute is located at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:544:13
… while evaluating attribute 'buildPhase' of derivation 'flutter-3.29.3-unwrapped'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/development/compilers/flutter/flutter.nix:89:5:
88|
89| buildPhase = ''
| ^
90| runHook preBuild
… while calling the 'getAttr' builtin
at <nix/derivation-internal.nix>:50:17:
49| value = commonAttrs // {
50| outPath = builtins.getAttr outputName strict;
| ^
51| drvPath = strict.drvPath;
… while calling the 'derivationStrict' builtin
at <nix/derivation-internal.nix>:37:12:
36|
37| strict = derivationStrict drvAttrs;
| ^
38|
… while evaluating derivation 'flutter-tools-3.29.3'
whose name attribute is located at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:544:13
… while evaluating attribute 'dartRuntimeCommand' of derivation 'flutter-tools-3.29.3'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/build-support/dart/build-dart-application/default.nix:146:9:
145| dartOutputType
146| dartRuntimeCommand
| ^
147| dartCompileFlags
… while calling the 'getAttr' builtin
at <nix/derivation-internal.nix>:50:17:
49| value = commonAttrs // {
50| outPath = builtins.getAttr outputName strict;
| ^
51| drvPath = strict.drvPath;
… while calling the 'derivationStrict' builtin
at <nix/derivation-internal.nix>:37:12:
36|
37| strict = derivationStrict drvAttrs;
| ^
38|
… while evaluating derivation 'flutter-engine-cf56914b326edb0ccb123ffdc60f00060bd513fa-dart'
whose name attribute is located at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:544:13
… while evaluating attribute 'buildCommand' of derivation 'flutter-engine-cf56914b326edb0ccb123ffdc60f00060bd513fa-dart'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/build-support/trivial-builders/default.nix:80:17:
79| enableParallelBuilding = true;
80| inherit buildCommand name;
| ^
81| passAsFile = [ "buildCommand" ] ++ (derivationArgs.passAsFile or [ ]);
… while calling the 'getAttr' builtin
at <nix/derivation-internal.nix>:50:17:
49| value = commonAttrs // {
50| outPath = builtins.getAttr outputName strict;
| ^
51| drvPath = strict.drvPath;
… while calling the 'derivationStrict' builtin
at <nix/derivation-internal.nix>:37:12:
36|
37| strict = derivationStrict drvAttrs;
| ^
38|
… while evaluating derivation 'flutter-engine-release-cf56914b326edb0ccb123ffdc60f00060bd513fa'
whose name attribute is located at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:544:13
… while evaluating attribute 'src' of derivation 'flutter-engine-release-cf56914b326edb0ccb123ffdc60f00060bd513fa'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/development/compilers/flutter/engine/package.nix:93:19:
92| pname = "flutter-engine-${runtimeMode}${lib.optionalString (!isOptimized) "-unopt"}";
93| inherit version src patches;
| ^
94|
… while calling the 'getAttr' builtin
at <nix/derivation-internal.nix>:50:17:
49| value = commonAttrs // {
50| outPath = builtins.getAttr outputName strict;
| ^
51| drvPath = strict.drvPath;
… while calling the 'derivationStrict' builtin
at <nix/derivation-internal.nix>:37:12:
36|
37| strict = derivationStrict drvAttrs;
| ^
38|
… while evaluating derivation 'flutter-engine-source-cf56914b326edb0ccb123ffdc60f00060bd513fa-aarch64-darwin-aarch64-darwin'
whose name attribute is located at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:544:13
… while evaluating attribute 'nativeBuildInputs' of derivation 'flutter-engine-source-cf56914b326edb0ccb123ffdc60f00060bd513fa-aarch64-darwin-aarch64-darwin'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:593:13:
592| depsBuildBuild = elemAt (elemAt dependencies 0) 0;
593| nativeBuildInputs = elemAt (elemAt dependencies 0) 1;
| ^
594| depsBuildTarget = elemAt (elemAt dependencies 0) 2;
… while calling the 'getAttr' builtin
at <nix/derivation-internal.nix>:50:17:
49| value = commonAttrs // {
50| outPath = builtins.getAttr outputName strict;
| ^
51| drvPath = strict.drvPath;
… while calling the 'derivationStrict' builtin
at <nix/derivation-internal.nix>:37:12:
36|
37| strict = derivationStrict drvAttrs;
| ^
38|
… while evaluating derivation 'cipd'
whose name attribute is located at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:544:13
… while evaluating attribute 'text' of derivation 'cipd'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/build-support/trivial-builders/default.nix:129:13:
128| inherit
129| text
| ^
130| executable
… while calling the 'getAttr' builtin
at <nix/derivation-internal.nix>:50:17:
49| value = commonAttrs // {
50| outPath = builtins.getAttr outputName strict;
| ^
51| drvPath = strict.drvPath;
… while calling the 'derivationStrict' builtin
at <nix/derivation-internal.nix>:37:12:
36|
37| strict = derivationStrict drvAttrs;
| ^
38|
… while evaluating derivation 'cipd-7120a6a515089a3ff5d1f61ff4ee17750dc038af'
whose name attribute is located at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:544:13
… while evaluating attribute 'src' of derivation 'cipd-7120a6a515089a3ff5d1f61ff4ee17750dc038af'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/development/compilers/flutter/engine/tools.nix:53:13:
52| {
53| src = fetchurl {
| ^
54| name = "cipd-${cipdCommit}-unwrapped";
… while calling a functor (an attribute set with a '__functor' attribute)
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/development/compilers/flutter/engine/tools.nix:53:19:
52| {
53| src = fetchurl {
| ^
54| name = "cipd-${cipdCommit}-unwrapped";
… from call site
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/lib/trivial.nix:1009:5:
1008| # TODO: Should we add call-time "type" checking like built in?
1009| __functor = self: f;
| ^
1010| __functionArgs = args;
… while calling anonymous lambda
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/lib/customisation.nix:863:9:
862| (
863| fpargs:
| ^
864| transformDrv (
… from call site
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/lib/customisation.nix:864:9:
863| fpargs:
864| transformDrv (
| ^
865| constructDrv (extendsWithExclusion excludeDrvArgNames extendDrvArgs (toFunction fpargs))
… while calling 'id'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/lib/trivial.nix:40:8:
39| */
40| id = x: x;
| ^
41|
… from call site
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/lib/customisation.nix:865:11:
864| transformDrv (
865| constructDrv (extendsWithExclusion excludeDrvArgNames extendDrvArgs (toFunction fpargs))
| ^
866| )
… while calling 'mkDerivation'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:66:18:
65| */
66| mkDerivation = fnOrAttrs: makeDerivationExtensible (toFunction fnOrAttrs);
| ^
67|
… from call site
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:66:29:
65| */
66| mkDerivation = fnOrAttrs: makeDerivationExtensible (toFunction fnOrAttrs);
| ^
67|
… while calling 'makeDerivationExtensible'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:77:5:
76| makeDerivationExtensible =
77| rattrs:
| ^
78| let
… from call site
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:138:22:
137|
138| finalPackage = mkDerivationSimple overrideAttrs args;
| ^
139|
… while calling 'mkDerivationSimple'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:773:5:
772| # * [package attributes]: https://nixos.org/manual/nix/stable/glossary#package-attribute-set
773| {
| ^
774|
… in the condition of the assert statement
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:801:5:
800| # Policy on acceptable hash types in nixpkgs
801| assert
| ^
802| attrs ? outputHash
… in the right operand of the IMPL (->) operator
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:803:7:
802| attrs ? outputHash
803| -> (
| ^
804| let
… while evaluating a branch condition
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:807:9:
806| in
807| if algo == "md5" then throw "Rejected insecure ${algo} hash '${attrs.outputHash}'" else true
| ^
808| );
… while evaluating the attribute 'outputHashAlgo'
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/build-support/fetchurl/default.nix:262:23:
261| # New-style output content requirements.
262| inherit (hash_) outputHashAlgo outputHash;
| ^
263|
… while evaluating a branch condition
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/build-support/fetchurl/default.nix:175:9:
174| hash_ =
175| if
| ^
176| with lib.lists;
… while calling the 'lessThan' builtin
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/build-support/fetchurl/default.nix:185:13:
184| ]
185| ) > 1
| ^
186| then
… while calling the 'length' builtin
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/build-support/fetchurl/default.nix:177:11:
176| with lib.lists;
177| length (
| ^
178| filter (s: s != "") [
… while calling the 'filter' builtin
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/build-support/fetchurl/default.nix:178:13:
177| length (
178| filter (s: s != "") [
| ^
179| hash
… while calling anonymous lambda
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/build-support/fetchurl/default.nix:178:21:
177| length (
178| filter (s: s != "") [
| ^
179| hash
error: attribute 'macos-arm64' missing
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/development/compilers/flutter/engine/tools.nix:56:22:
55| url = "https://chrome-infra-packages.appspot.com/client?platform=${stdenv-constants.platform}&version=git_revision:${cipdCommit}";;
56| hash = cipdHashes.${stdenv-constants.platform};
| ^
57| };
Did you mean mac-arm64?
https://github.com/NixOS/nixpkgs/pull/459527 failed to build: Failed to list packages: nix-env failed with exit code 1
This Commit seems to have fixed the error. https://github.com/NixOS/nixpkgs/commit/78959ee6e3db1762024c4f8068cc9db57b8d5a6e#diff-a02d8cf7491f5e3faf1245b0bce2bad970c5924fd4b67e954d04cef7ee13147e
I still have no idea, why it wasn't broken for others, anyway... | 10:22:04 |
| purrtner | * Hi Ben, sorry for taking so long to respond. It seems, there has been an upstream change, that fixed the issue.
The error was this one:
Local evaluation for computing rebuilds
$ nix-env --extra-experimental-features no-url-literals --option system aarch64-darwin -f <nixpkgs> --nix-path nixpkgs=/Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs nixpkgs-overlays=/private/tmp/nix-shell-1673-462192242/tmpa3pj3v9z -qaP --xml --out-path --show-trace --no-allow-import-from-derivation
error:
… while querying the derivation named 'flutter-wrapped-3.29.3-sdk-links'
…
error: attribute 'macos-arm64' missing
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/development/compilers/flutter/engine/tools.nix:56:22:
55| url = "https://chrome-infra-packages.appspot.com/client?platform=${stdenv-constants.platform}&version=git_revision:${cipdCommit}";;
56| hash = cipdHashes.${stdenv-constants.platform};
| ^
57| };
Did you mean mac-arm64?
https://github.com/NixOS/nixpkgs/pull/459527 failed to build: Failed to list packages: nix-env failed with exit code 1
This Commit seems to have fixed the error. https://github.com/NixOS/nixpkgs/commit/78959ee6e3db1762024c4f8068cc9db57b8d5a6e#diff-a02d8cf7491f5e3faf1245b0bce2bad970c5924fd4b67e954d04cef7ee13147e
I still have no idea, why it wasn't broken for others, anyway... | 10:28:48 |
| tao | Thank you! Do those unnecessary entries pin to an older nixpkgs as Tristan pointed out? | 10:28:48 |
| niklaskorz | no | 10:28:58 |
| purrtner | * Hi Ben, sorry for taking so long to respond. It seems, there has been an upstream change, that fixed the issue.
The error was this one:
Local evaluation for computing rebuilds
$ nix-env --extra-experimental-features no-url-literals --option system aarch64-darwin -f <nixpkgs> --nix-path nixpkgs=/Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs nixpkgs-overlays=/private/tmp/nix-shell-1673-462192242/tmpa3pj3v9z -qaP --xml --out-path --show-trace --no-allow-import-from-derivation
error:
… while querying the derivation named 'flutter-wrapped-3.29.3-sdk-links'
………
error: attribute 'macos-arm64' missing
at /Users/edean/.cache/nixpkgs-review/pr-459527-1/nixpkgs/pkgs/development/compilers/flutter/engine/tools.nix:56:22:
55| url = "https://chrome-infra-packages.appspot.com/client?platform=${stdenv-constants.platform}&version=git_revision:${cipdCommit}";;
56| hash = cipdHashes.${stdenv-constants.platform};
| ^
57| };
Did you mean mac-arm64?
https://github.com/NixOS/nixpkgs/pull/459527 failed to build: Failed to list packages: nix-env failed with exit code 1
This Commit seems to have fixed the error. https://github.com/NixOS/nixpkgs/commit/78959ee6e3db1762024c4f8068cc9db57b8d5a6e#diff-a02d8cf7491f5e3faf1245b0bce2bad970c5924fd4b67e954d04cef7ee13147e
I still have no idea, why it wasn't broken for others, anyway... | 10:29:02 |
| niklaskorz | they completely invalidate your whole package tree | 10:29:04 |
| niklaskorz | and are incorrect | 10:29:06 |
| niklaskorz | well not nix.enable = false; | 10:29:58 |
| tao | Ok I'll give this a shot, thank you | 10:30:07 |
