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Proof of concept Linux -> macOS cross compilation in Nixpkgs
Raw
flake.lock
{
"nodes": {
"flake-utils": {
"inputs": {
"systems": "systems"
},
"locked": {
"lastModified": 1710146030,
"narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1712849433,
"narHash": "sha256-flQtf/ZPJgkLY/So3Fd+dGilw2DKIsiwgMEn7BbBHL0=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "f173d0881eff3b21ebb29a2ef8bedbc106c86ea5",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs"
}
},
"systems": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
}
},
"root": "root",
"version": 7
}
Raw
flake.nix
{
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
flake-utils.url = "github:numtide/flake-utils";
};
outputs = { self, nixpkgs, flake-utils }:
flake-utils.lib.eachDefaultSystem (system: let
pkgs = import nixpkgs {
inherit system;
config.allowUnsupportedSystems = true;
};
package = pkgs.callPackage ./package.nix { };
in {
packages.default = package;
packages.hello = package;
devShells.default = pkgs.mkShell {
inputsFrom = [
package
];
};
}) # eachDefaultSystem
; # outputs
}
Raw
macos-cross.nix
{
path,
lib,
stdenvNoCC,
darwin,
llvmPackages_15,
wrapCCWith,
hello,
coreutils,
python3,
boost,
}: let
darwinPkgs = import path {
localSystem.system = "x86_64-darwin";
config.allowUnsupportedSystem = true;
};
libunwind = darwinPkgs.llvmPackages.libunwind;
libcxx = darwinPkgs.llvmPackages.libcxx;
llvmPackages = llvmPackages_15;
darwinSdk = darwin.apple_sdk_11_0.MacOSX-SDK;
libc = darwin.apple_sdk_11_0.Libsystem;
inherit (llvmPackages) clang-unwrapped;
extraBuildCommands = {
libcxx-cxxflags = let
list = [
#"-nostdlib++"
#"-nostdinc++"
#"-nostartfiles"
"-isystem ${lib.getDev libcxx}/include/c++/v1"
"-isystem ${darwinSdk}/usr/include"
"-idirafter ${darwinSdk}/usr/include"
"-iframework${darwinSdk}/System/Library/Frameworks"
"-L${darwinSdk}/usr/lib"
"-L${lib.getLib libunwind}"
"-lc++"
"-lc++abi"
];
op = acc: item: acc + "\necho ${lib.strings.escapeShellArg item} >> \"$out/nix-support/libcxx-cxxflags\"";
in lib.foldl' op "" list;
};
cc = wrapCCWith {
cc = clang-unwrapped;
#echo "-isystem ${darwinSdk}/usr/include" >> "$out/nix-support/libc-cflags"
#echo "-idirafter ${darwinSdk}/usr/include" >> "$out/nix-support/libc-cflags"
#echo "-iframework${darwinSdk}/System/Library/Frameworks" >> "$out/nix-support/libc-cflags"
#echo "-isystem ${darwinSdk}/System/Library/Frameworks/Kernel.framework/Versions/A/Headers" >> "$out/nix-support/libc-cflags"
# We need to remove the -dynamic-linker arguments lol
extraBuildCommands = ''
echo "making wrapper stuff in $out"
cat ${./osxcross-cc-wrapper-hook.bash} >> "$out/nix-support/cc-wrapper-hook"
'' + extraBuildCommands.libcxx-cxxflags;
#echo "-isystem ${lib.getDev libcxx}/include/c++/v1" >> "$out/nix-support/libcxx-cxxflags"
#echo "-isystem ${darwinSdk}/usr/include" >> "$out/nix-support/libcxx-cxxflags"
#echo "-lc++" >> "$out/nix-support/libcxx-cxxflags"
#echo "-lc++abi" >> "$out/nix-support/libcxx-cxxflags"
#echo "-L${darwinSdk}/usr/lib" >> "$out/nix-support/libcxx-cxxflags"
#echo "-L${libunwind}/lib" >> "$out/nix-support/libcxx-cxxflags"
#echo "-idirafter ${darwinSdk}/usr/include" >> "$out/nix-support/libcxx-cxxflags"
#echo "-iframework${darwinSdk}/System/Library/Frameworks" >> "$out/nix-support/libcxx-cxxflags"
#echo "-idirafter ${darwinSdk}/System/Library/Frameworks/Kernel.framework/Versions/A/Headers" >> "$out/nix-support/libc-cflags"
inherit libc;
bintools = llvmPackages.bintools.override {
inherit libc;
};
#inherit (llvmPackages) libcxx;
gccForLibs = null;
extraTools = lib.singleton llvmPackages.lld;
isClang = true;
useCcForLibs = false;
nixSupport.cc-cflags = [
#"-nostdlib"
#"-isystem" "${darwinSdk}/usr/include"
"-idirafter" "${darwinSdk}/System/Library/Frameworks/Kernel.framework/Versions/A/Headers"
"--target=x86_64-apple-macosx11.0"
"-fuse-ld=lld"
"-DTARGET_OS_MACOSX"
];
nixSupport.cc-ldflags = [
#"-fuse-ld=lld"
"-lc"
"-L${darwinSdk}/usr/lib"
];
};
#stdenv = overrideCC stdenvNoCC cc;
stdenv = stdenvNoCC.override {
hostPlatform = lib.systems.elaborate "x86_64-darwin";
inherit (stdenvNoCC) buildPlatform;
targetPlatform = lib.systems.elaborate "x86_64-darwin";
inherit cc;
hasCC = true;
allowedRequisites = null;
};
trivial-c-cxx = stdenv.mkDerivation {
name = "trivial-c-c++";
#passthru = {
# inherit toCCArgs cc;
#};
src = ./.;
nativeBuildInputs = [
#cc
#llvmPackages.lld
];
buildPhase = ''
runHook preBuild
mkdir -p "$out"
(set -x && cc -o $out/main-c ./main.c)
(set -x && c++ -o $out/main-cpp ./main.cpp)
runHook postBuild
'';
};
hello-darwin = (hello.override { inherit stdenv; }).overrideAttrs (prev: {
buildInputs = prev.buildInputs or [ ] ++ [
darwinPkgs.libiconv
];
});
python3-darwin = (python3.override {
inherit stdenv;
enableLTO = false;
configd = darwinPkgs.darwin.apple_sdk.frameworks.SystemConfiguration;
}).overrideAttrs (prev: {
configureFlags = prev.configureFlags or [ ] ++ [
"MACHDEP=darwin"
];
});
in hello-darwin
Raw
osxcross-cc-wrapper-hook.bash
declare -a _extraBefore
for arg in "${extraBefore[@]}"; do
if [[ "$arg" != *"-dynamic-linker"* ]]; then
_extraBefore+=("$arg")
fi
done
extraBefore=("${_extraBefore[@]}")
unset _extraBefore
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