Cross-compiling 'hello' to raspberryPi

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1

Hi,

Following

https://nixos.org/manual/nixpkgs/stable/#cross-qa-avoid-compiling-gcc-cross-compiler

I tried

$nix-build '<nixpkgs>' -A pkgsCross.raspberryPi.hello

and, because I’ve enabled flakes:

$ nix build -f channel:nixpkgs-unstable pkgsCross.raspberryPi.hello

and they both failed with “exec format error”, indicating that something is trying to run cross-compiled binaries on the host system. Here’s a full build log: cross-compile hello build log · GitHub.

I’m puzzled because this seems like a very basic cross-compilation task, so there’s possibly something fundamentally wrong with my setup. Everything not related to pkgsCross seems to work as expected.

I’m on NixOS 22.11, in a aarch-linux UTM virtual machine running on macOS M1.

Elias

2

It seems to be in order when cross compiling from x86_64-linux:

$ nixos-version
22.11.2759.7076110064c (Raccoon)
$ nix build -f '<nixpkgs>' pkgsCross.raspberryPi.hello
$ qemu-arm result/bin/hello 
Hello, world!
3

I just upgraded to latest:

nixos-version
22.11.20230306.47c0034 (Raccoon)

And tried again. I got a similar build error.

4

Possibly addressed by lib/systems/parse: stop considering armv8a able to execute armv7l by Atemu · Pull Request #211950 · NixOS/nixpkgs · GitHub

5

That seems very relevant, thank you! I’ll link to it in my bug report,

6

I can confirm this PR fixes the issue. Thank you!