| 7 Jun 2026 |
 K900 | Or rather, in your specific case, probably nix-shell -A pkgsCross.aarch64-multiplatform.foo | 14:25:14 |
 richarddodd | Would that use my own local copy of nixpkgs, so I can start debug/run cycling? | 14:26:21 |
| richarddodd | oh - I think I understand - I go to the root of nixpkgs and then run that to use a particular attribute rather than the root attribute? | 14:28:20 |
| K900 | Yes | 14:28:50 |
| richarddodd | I think that was the thing I wasn't understanding. Thanks | 14:29:14 |
|  zimward changed their display name from zimward @GPN24 to zimward. | 21:07:32 |
| 8 Jun 2026 |
|  9lore changed their display name from 9lore | call LORE to 9lore. | 00:35:30 |
| 10 Jun 2026 |
 eureka-cpu | is there a guide for how to use windows.pthreads? I have some rust code I'm trying to cross compile from x86_64-linux to mingw-ucrt-x86_64-llvm, but hit a snag on needing pthreads. I added it but then I get the supported platform error since it doesn't include any platforms. What's the intended way of using it? Forgive my sloppy code, but here's what I currently have:
test-cargo-reaper-build-cross-windows =
let
inherit (pkgs.lib.systems.examples.mingw-ucrt-x86_64-llvm.rust) rustcTarget;
crossPkgs = pkgs.pkgsCross.mingw-ucrt-x86_64-llvm;
mingwCC = crossPkgs.stdenv.cc;
crossCC = "${mingwCC}/bin/${mingwCC.targetPrefix}cc";
crossCXX = "${mingwCC}/bin/${mingwCC.targetPrefix}c++";
rustWithWindowsTarget = fenix.packages.${system}.combine [
rustToolchain
(fenix.packages.${system}.targets.${rustcTarget}.toolchainOf {
channel = "1.87.0";
sha256 = "sha256-KUm16pHj+cRedf8vxs/Hd2YWxpOrWZ7UOrwhILdSJBU=";
}).rust-std
];
craneLibCross =
let
craneLib = (crane.mkLib pkgs).overrideToolchain rustWithWindowsTarget;
in
craneLib // (cargoReaper.crane { inherit craneLib; });
crossArgs = {
src = testFileset ./tests/plugin_manifests/package_manifest;
strictDeps = true;
nativeBuildInputs = [
mingwCC
pkgs.llvmPackages.bintools
pkgs.windows.pthreads
];
CARGO_BUILD_TARGET = rustcTarget;
CARGO_TARGET_X86_64_PC_WINDOWS_GNULLVM_LINKER =
"${mingwCC}/bin/${mingwCC.targetPrefix}cc";
"CC_${rustcTarget}" = crossCC;
"CXX_${rustcTarget}" = crossCXX;
};
cargoArtifactsCross = craneLibCross.buildDepsOnly crossArgs;
in
craneLibCross.buildReaperExtension (crossArgs // {
cargoArtifacts = cargoArtifactsCross;
package = "package_manifest";
plugin = "reaper_package_ext";
target = rustcTarget;
doInstallCheck = true;
installCheckPhase = ''
test -f $out/lib/reaper_package_ext.dll
'';
});
| 18:28:06 |
| eureka-cpu | * is there a guide for how to cross compile to windows? I have some rust code I'm trying to cross compile from x86_64-linux to mingw-ucrt-x86_64-llvm, but hit a snag on needing pthreads. I added it but then I get the supported platform error since it doesn't include any platforms. What's the intended way of using it? Forgive my sloppy code, but here's what I currently have:
test-cargo-reaper-build-cross-windows =
let
inherit (pkgs.lib.systems.examples.mingw-ucrt-x86_64-llvm.rust) rustcTarget;
crossPkgs = pkgs.pkgsCross.mingw-ucrt-x86_64-llvm;
mingwCC = crossPkgs.stdenv.cc;
crossCC = "${mingwCC}/bin/${mingwCC.targetPrefix}cc";
crossCXX = "${mingwCC}/bin/${mingwCC.targetPrefix}c++";
rustWithWindowsTarget = fenix.packages.${system}.combine [
rustToolchain
(fenix.packages.${system}.targets.${rustcTarget}.toolchainOf {
channel = "1.87.0";
sha256 = "sha256-KUm16pHj+cRedf8vxs/Hd2YWxpOrWZ7UOrwhILdSJBU=";
}).rust-std
];
craneLibCross =
let
craneLib = (crane.mkLib pkgs).overrideToolchain rustWithWindowsTarget;
in
craneLib // (cargoReaper.crane { inherit craneLib; });
crossArgs = {
src = testFileset ./tests/plugin_manifests/package_manifest;
strictDeps = true;
nativeBuildInputs = [
mingwCC
pkgs.llvmPackages.bintools
pkgs.windows.pthreads
];
CARGO_BUILD_TARGET = rustcTarget;
CARGO_TARGET_X86_64_PC_WINDOWS_GNULLVM_LINKER =
"${mingwCC}/bin/${mingwCC.targetPrefix}cc";
"CC_${rustcTarget}" = crossCC;
"CXX_${rustcTarget}" = crossCXX;
};
cargoArtifactsCross = craneLibCross.buildDepsOnly crossArgs;
in
craneLibCross.buildReaperExtension (crossArgs // {
cargoArtifacts = cargoArtifactsCross;
package = "package_manifest";
plugin = "reaper_package_ext";
target = rustcTarget;
doInstallCheck = true;
installCheckPhase = ''
test -f $out/lib/reaper_package_ext.dll
'';
});
| 18:49:17 |
| eureka-cpu | Ah so the pthreads problem was with libc, it hasn't even gotten to my build yet:
Cannot build '/nix/store/2qixrw546lxpxqkwyglhzhhnf2m7kv2b-compiler-rt-libc-x86_64-w64-mingw32-21.1.8.drv'
| 19:58:03 |
| eureka-cpu | Is mingw just broken atm? | 19:58:57 |
| eureka-cpu | * Is mingw-ucrt-x86_64-llvm just broken atm? | 19:59:55 |
 symphorien | cross compiling is best effort as a general rule | 20:20:13 |
| symphorien | meaning that if nobody cares about a specific triple enough to compile stuff regularly with it and to contribute fixes, it will most probably be broken | 20:21:42 |
| 11 Jun 2026 |
| eureka-cpu | I was able to make it work with mingwW64 and some extra environment variables. mingw-ucrt-x86_64-llvm is indeed borked at the moment. | 02:54:09 |
 @rosssmyth:matrix.org | Yeah the ucrt code paths are not as well tested. Crane also has weird cross behavior itself, and rustPlatform is more reliable for Rust cross. If you cannot got it to cross with rustPlatform, you can open an issue on Nixpkgs with some logs and an MVP, and post in #windows:nixos.org. One of us may look into it. | 15:21:59 |
| eureka-cpu | The crane cross story has gotten more reliable not too long ago | 15:47:46 |
| eureka-cpu | I'll give that a try though if I get an ABI mismatch. Was trying to compile a DLL for an application. | 15:48:13 |
| 13 Jun 2026 |
|  debtquity set a profile picture. | 03:23:13 |
| 15 Jun 2026 |
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| 18 Jun 2026 |
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| whispers [& it/fae] changed their display name from meow meow to whispers [& it/fae]. | 19:12:10 |
| 23 May 2021 |
|  @grahamc:nixos.org set the history visibility to "world_readable". | 12:31:03 |
| @grahamc:nixos.org changed the room name to "" from "". | 12:31:03 |
| @grahamc:nixos.org invited  Alyssa Ross. | 12:31:18 |
| Alyssa Ross joined the room. | 13:21:04 |
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