Nix Cross Compiling - Public Room Timeline

	Nix Cross Compiling	581 Members
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Sender	Message	Time
7 Mar 2025
alexfmpe	I'm getting some "cannot find types.h" or "cannot find strings.h" with several things under `pkgsCross.aarch64-android-prebuilt`	20:42:54
alexfmpe	* I'm getting some "types.h file not found" or "strings.h file not found" with several things under `pkgsCross.aarch64-android-prebuilt`	20:43:25
alexfmpe	any idea how can I dig more into this?	20:44:15
	puffnfresh joined the room.	22:17:39
8 Mar 2025
alexfmpe	I can see the standard header files in `/nix/store/vnpih2i860advbsw2g0dj6cx1j1dc256-aarch64-unknown-linux-android-ndk-toolchain-26.3.11579264/toolchain/sysroot/usr/include` but going by `strace -f` when reproducing the error, only `toolchain/lib/clang/17/include` seems to be looked at	02:55:23
alexfmpe	seems this was working around november	02:56:14
alexfmpe	* I can see the standard header files in `/nix/store/vnpih2i860advbsw2g0dj6cx1j1dc256-aarch64-unknown-linux-android-ndk-toolchain-26.3.11579264/toolchain/sysroot/usr/include` but going by `strace -f` when reproducing the error on a standalone invocation, only `toolchain/lib/clang/17/include` seems to be looked at	03:02:27
	Qyriad changed their display name from qyriad to Qyriad.	21:41:03
9 Mar 2025
	picostove joined the room.	19:37:53
10 Mar 2025
	Charles left the room.	22:29:16
Axman6	I'm currently working on moving some projects at work to build using Nix, things are working find for macOS and linux, but we also need to produce artefacts for windows. Specifically, we're bundling a python application using pyinstaller, and the mere involvement of python seems to cause a lot of issues as a lot of what it takes to build a python package involves running code on the buildPlatform which is intended for the hostPlatform. Is there any hope in being able to achieve this? I've managed to build C and C++ things for windows using pkgsCross.mingwW64 (though I'd also love to know if I should target one of the crt platforms instead), but python seems particularly problematic. Maybe some kind of windows based franken-builder that's able to natively run windows binaries under WSL or something?	23:41:32
11 Mar 2025
puffnfresh	Nix can execute Windows binaries within WSL	00:18:56
puffnfresh	alternatively, Wine can execute within a Nix build, I've been doing that recently	00:20:37
puffnfresh	and finally I'm working on native Nix on Windows, but we're many months away from actually building the first derivation	00:21:49
Axman6	@puffnfreshG'day g'day - yeah I need to look more into using wine for things. I have a good grasp how a linux VM operates but wine feels like a different beast	00:44:38
puffnfresh	`{ stdenv , wine64Packages }: stdenv.mkDerivation { name = "wine-example"; nativeBuildInputs = [ wine64Packages.minimal ]; dontUnpack = true; buildPhase = '' WINEPREFIX=$PWD/.wine wine64 cmd.exe /c "echo %HOMEDRIVE% > Z:$out" ''; }`	02:38:39
alexfmpe	bisected down to https://github.com/NixOS/nixpkgs/issues/191152 confirmed I can get libffi and gmp building again by adding a `&& !targetPlatform.isAndroid` howver I don't understand why it matters? I'm building from nixos, there's nothing on `/usr/include`	13:41:24
alexfmpe	er, rather, bisected down to https://github.com/NixOS/nixpkgs/pull/356162 which fixes that issue	13:42:12
alexfmpe	I guess there's some sysroot shenanigans I don't understand going on and having `-nostdlibinc` is messing with it?	13:43:50
alexfmpe	hmm though... merely adding `&& !targetPlatform.isAndroid` seems risky for non-nixos linux as `/usr/include` can leak there?	13:49:30
Alyssa Ross	Redacted or Malformed Event	13:52:46
13 Mar 2025
loudgolem	`nix-build '<nixpkgs>' --arg crossSystem '(import <nixpkgs> {}).lib.systems.examples.aarch64-multiplatform' -A tinc nix-build '<nixpkgs>' -A pkgsCross.aarch64-multiplatform.tinc` any reason why lib.systems.examples, examples is there	05:51:13
loudgolem	* `nix-build '<nixpkgs>' --arg crossSystem '(import <nixpkgs> {}).lib.systems.examples.aarch64-multiplatform' -A tinc nix-build '<nixpkgs>' -A pkgsCross.aarch64-multiplatform.tinc` any reason why `lib.systems.examples`, examples is there	05:51:19
loudgolem	* `nix-build '<nixpkgs>' --arg crossSystem '(import <nixpkgs> {}).lib.systems.examples.aarch64-multiplatform' -A tinc nix-build '<nixpkgs>' -A pkgsCross.aarch64-multiplatform.tinc` any reason why `lib.systems.examples`, examples is there	05:51:37
Artturin	In reply to @phanirithvij:matrix.org `nix-build '<nixpkgs>' --arg crossSystem '(import <nixpkgs> {}).lib.systems.examples.aarch64-multiplatform' -A tinc nix-build '<nixpkgs>' -A pkgsCross.aarch64-multiplatform.tinc` any reason why `lib.systems.examples`, examples is there It's easier to refer to existing example platforms than to write all the attrs, some platforms have more than just `config` https://github.com/NixOS/nixpkgs/blob/master/lib/systems/examples.nix `pkgsCross` sets are made from `examples` https://github.com/NixOS/nixpkgs/blob/b1f2198021490b51fb92b8b09db97b9ba2a7b4ce/pkgs/top-level/stage.nix#L197	05:55:54
	Ashwin Mathi joined the room.	14:58:36
@rosssmyth:matrix.org	Would it be possible to add a new default/example pkgsCross system that is basically the same as arm-embedded but with newlib-nano? My goal would be to get that GCC cached so that I could use a newer GCC since it seems that latest gcc-arm-embedded update (14) PR was denied.	18:55:20
@rosssmyth:matrix.org	I don't know what would be involved beyond adding something to the examples file, but I would be willing to do it	19:01:07
15 Mar 2025
	implr joined the room.	17:07:38
implr	I ran into https://github.com/NixOS/nixpkgs/issues/231537 while cross compiling from a x86 host to a rv64 target. I know it's fixed in unstable, but this makes me wonder about a more general problem: Shellcheck doesn't care what host arch it runs on. Theoretically, we could shellcheck the rv64 shell scripts with a host (x86) shellcheck, eliminating the need for a rv64 ghc. Is that even possible in nixpkgs?	17:10:09

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