nixpkgs/pkgs/test/rust-sysroot/default.nix

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{ lib, rustPlatform, fetchFromGitHub, writeText }:
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rustPlatform.buildRustPackage rec {
name = "blog_os-sysroot-test";
src = fetchFromGitHub {
owner = "phil-opp";
repo = "blog_os";
rev = "4e38e7ddf8dd021c3cd7e4609dfa01afb827797b";
sha256 = "0k9ipm9ddm1bad7bs7368wzzp6xwrhyfzfpckdax54l4ffqwljcg";
};
cargoSha256 = "1cbcplgz28yxshyrp2krp1jphbrcqdw6wxx3rry91p7hiqyibd30";
# The book uses rust-lld for linking, but rust-lld is not currently packaged for NixOS.
# The justification in the book for using rust-lld suggests that gcc can still be used for testing:
# > Instead of using the platform's default linker (which might not support Linux targets),
# > we use the cross platform LLD linker that is shipped with Rust for linking our kernel.
# https://github.com/phil-opp/blog_os/blame/7212ffaa8383122b1eb07fe1854814f99d2e1af4/blog/content/second-edition/posts/02-minimal-rust-kernel/index.md#L157
target = writeText "x86_64-blog_os.json" ''
{
"llvm-target": "x86_64-unknown-none",
"data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
"arch": "x86_64",
"target-endian": "little",
"target-pointer-width": "64",
"target-c-int-width": "32",
"os": "none",
"executables": true,
"linker-flavor": "gcc",
"panic-strategy": "abort",
"disable-redzone": true,
"features": "-mmx,-sse,+soft-float"
}
'';
RUSTFLAGS = "-C link-arg=-nostartfiles";
# Tests don't work for `no_std`. See https://os.phil-opp.com/testing/
doCheck = false;
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meta = with lib; {
description = "Test for using custom sysroots with buildRustPackage.";
maintainers = with maintainers; [ aaronjanse ];
};
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}