Cross Compiling
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For building arm software check out the Article NixOS on ARM
If you are looking for building 32bit software, check out Packaging/32bit Applications
Quick example to cross compile a package: Cheatsheet#Cross-compile_packages.
Cross-Compiling in nixpkgs unstable (pre-18.09)
A lot has happened in 2018 and now cross-compilation is well supported within the unstable branch of nixpkgs.
The basic idea is to use pkgsCross.platform instead of pkgs:
nix build -f channel:nixos-unstable pkgsCross.raspberryPi.emacs
How to specify dependencies
Depending in which if packages are required at build time or at runtime they need to go to different inputs the derivation.
- If it is used at build-time it's
depsBuildXXX- compiler producing native binaries go to
depsBuildBuild - compiler producing cross binaries, all setup hooks and programs executed by the builder go to
depsBuildHost- common examples:
pkgconfig, autoreconfHook, makeWrapper, intltool, bison, flex
- common examples:
- compiler producing native binaries go to
- If it is used at run-time it's
depsHostXXX. [Stack linking doesn't effect this, even if it allows us to forget where things came from.]- if it’s an interpreter that will be needed by an installed script, it should go in
depsHostTarget. - otherwise it is probably only needed at build time and can go in
depsBuildHost
- if it’s an interpreter that will be needed by an installed script, it should go in
- If it is a tool and "acts" (e.g. helps build) on build-time stuff, then it's
depsXXXBuild - If it is a tool and "acts" on run-time stuff, then it's
depsXXXHost - if it is not a tool, it's
depsXXX(XXX+1)(build + 1 == host, host +1 == target) for backwards compatibility, usenativeBuildInputsinstead ofdepsBuildHostandbuildInputsinstead ofdepsHostTarget.
Source: https://github.com/NixOS/nixpkgs/pull/50881#issuecomment-440772499
References
- Nixpkgs manual on cross compiling
- Nixpkgs manual on Specifying dependencies