Packaging/32bit Applications: Difference between revisions
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Nixpkgs provides <code>multiStdenv.mkDerivation</code> that should be used instead <code>stdenv.mkDerivation</code>. | Nixpkgs provides <code>multiStdenv.mkDerivation</code> that should be used instead <code>stdenv.mkDerivation</code>. | ||
This is equivalent to using <code>gcc-multilib</code> in debian derivatives. | This is equivalent to using <code>gcc-multilib</code> in debian derivatives. | ||
=== Rust === | |||
<syntaxhighlight lang="nix"> | |||
env = { | |||
# Use multilib clang as linker for i686 target. | |||
# Required because Rust's bundled LLD doesn't know about Nix's multilib sysroot paths. | |||
# clang_multi has the correct 32-bit library paths (glibc_multi) baked into its driver. | |||
CARGO_TARGET_I686_UNKNOWN_LINUX_GNU_LINKER = "${pkgs.clang_multi}/bin/clang"; | |||
}; | |||
packages = with pkgs; [ | |||
# clang with multilib support (both 32-bit and 64-bit) | |||
# This properly handles -m32 compilation with correct headers/libs | |||
clang_multi | |||
]; | |||
</syntaxhighlight>An example that will let you build with <code>cargo test --target i686-unknown-linux-gnu</code>. | |||
You will want something similar to the following in your <code>flake.nix</code>, <code>devenv.sh</code> , or whatever you're using as your entry point. | |||
[[Category:Development]] | [[Category:Development]] | ||
Revision as of 09:10, 13 December 2025
Building software with 32bit gcc
Question: I'm invoking gcc with -m32 and it fails to find `gnu/stubs-32.h`
Answer (clever): you want to use pkgsi686Linux instead of pkgs, so things like pkgsi686Linux.stdenv.mkDerivation or pkgsi686Linux.callPackage then nix will give you 32bit everything[1]
Building software with both 32- and 64-bit executables
If a package wants to compile both 32/64-bit executables, you need a compiler with multilib support.
Nixpkgs provides multiStdenv.mkDerivation that should be used instead stdenv.mkDerivation.
This is equivalent to using gcc-multilib in debian derivatives.
Rust
env = {
# Use multilib clang as linker for i686 target.
# Required because Rust's bundled LLD doesn't know about Nix's multilib sysroot paths.
# clang_multi has the correct 32-bit library paths (glibc_multi) baked into its driver.
CARGO_TARGET_I686_UNKNOWN_LINUX_GNU_LINKER = "${pkgs.clang_multi}/bin/clang";
};
packages = with pkgs; [
# clang with multilib support (both 32-bit and 64-bit)
# This properly handles -m32 compilation with correct headers/libs
clang_multi
];
An example that will let you build with cargo test --target i686-unknown-linux-gnu.
You will want something similar to the following in your flake.nix, devenv.sh , or whatever you're using as your entry point.