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5c19b2c27b
This allows cross compiling from aarch64-darwin to x86_64-linux. It is required for building Go binaries on macos that target Linux and have CGO enabled.
64 lines
2.1 KiB
Nix
64 lines
2.1 KiB
Nix
# cross compiler toolchain for cc rules in Bazel
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# execution platform: aarch64-darwin
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# target platform: x86_64-linux
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# inspired by https://github.com/tweag/rules_nixpkgs/blob/21c4ea481021cb51a6e5d0969b2cee03dba5a637/examples/toolchains/cc_cross_osx_to_linux_amd64/toolchains/osxcross_cc.nix
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let
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targetSystem = "x86_64-linux";
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og = import <nixpkgs> { };
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nixpkgs = import <nixpkgs> {
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buildSystem = builtins.currentSystem;
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hostSystem = targetSystem;
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crossSystem = {
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config = targetSystem;
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};
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crossOverlays = [
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(self: super: {
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llvmPackages_11 = super.llvmPackages_11.extend (final: prev: rec {
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libllvm = prev.libllvm.overrideAttrs (old: {
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LDFLAGS = "-L ${super.llvmPackages_11.libcxxabi}/lib";
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nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [ og.darwin.cctools ];
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});
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libclang = prev.libclang.override {
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inherit libllvm;
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};
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libraries = super.llvmPackages_11.libraries;
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});
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})
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];
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};
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pkgsLinux = import <nixpkgs> {
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config = { };
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overlays = [ ];
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system = targetSystem;
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};
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in
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let
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pkgs = nixpkgs.buildPackages;
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linuxCC = pkgs.wrapCCWith rec {
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cc = pkgs.llvmPackages_11.clang-unwrapped;
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bintools = pkgs.llvmPackages_11.bintools;
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extraPackages = [ pkgsLinux.glibc.static pkgs.llvmPackages_11.libraries.libcxxabi pkgs.llvmPackages_11.libraries.libcxx ];
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extraBuildCommands = ''
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echo "-isystem ${pkgs.llvmPackages_11.clang-unwrapped.lib}/lib/clang/${cc.version}/include" >> $out/nix-support/cc-cflags
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echo "-isystem ${pkgsLinux.glibc.dev}/include" >> $out/nix-support/cc-cflags
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echo "-L ${pkgs.llvmPackages_11.libraries.libcxxabi}/lib" >> $out/nix-support/cc-ldflags
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echo "-L ${pkgsLinux.glibc.static}/lib" >> $out/nix-support/cc-ldflags
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echo "-resource-dir=${cc}/resource-root" >> $out/nix-support/cc-cflags
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'';
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};
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in
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pkgs.buildEnv (
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let
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cc = linuxCC;
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in
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{
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name = "bazel-${cc.name}-cc";
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paths = [ cc cc.bintools ];
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pathsToLink = [ "/bin" ];
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passthru = {
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inherit (cc) isClang targetPrefix;
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orignalName = cc.name;
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};
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}
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)
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