Commit b45cf446 authored by Ryan Burns's avatar Ryan Burns
Browse files

linuxHeaders: fix cross-compilation from darwin to mips 



mips tools require endian headers which are different on darwin.
Add stub headers to define the appropriate byte swap functions.

Co-authored-by: default avatarAdam Joseph <54836058+amjoseph-nixpkgs@users.noreply.github.com>
parent 4b73e231

pkgs/os-specific/linux/kernel-headers/default.nix

+30 −0
Original line number Diff line number Diff line 
{ stdenvNoCC, lib, buildPackages, fetchurl, perl, elf-header

, bison ? null, flex ? null, python ? null, rsync ? null

, writeTextFile

}:



assert stdenvNoCC.hostPlatform.isAndroid ->

  (flex != null && bison != null && python != null && rsync != null);



let



  # As part of building a hostPlatform=mips kernel, Linux creates and runs a

  # tiny utility `arch/mips/boot/tools/relocs_main.c` for the buildPlatform.

  # This utility references a glibc-specific header `byteswap.h`.  There is a

  # compatibility header in gnulib for most BSDs, but not for Darwin, so we

  # synthesize one here.

  darwin-endian-h = writeTextFile {

    name = "endian-h";

    text = ''

      #include <byteswap.h>

    '';

    destination = "/include/endian.h";

  };

  darwin-byteswap-h = writeTextFile {

    name = "byteswap-h";

    text = ''

      #pragma once

      #include <libkern/OSByteOrder.h>

      #define bswap_16 OSSwapInt16

      #define bswap_32 OSSwapInt32

      #define bswap_64 OSSwapInt64

    '';

    destination = "/include/byteswap.h";

  };



  makeLinuxHeaders = { src, version, patches ? [] }: stdenvNoCC.mkDerivation {

    inherit src;
@@ -25,6 +51,10 @@ let 
      perl elf-header

    ] ++ lib.optionals stdenvNoCC.hostPlatform.isAndroid [

      flex bison python rsync

    ] ++ lib.optionals (stdenvNoCC.buildPlatform.isDarwin &&

                        stdenvNoCC.hostPlatform.isMips) [

      darwin-endian-h

      darwin-byteswap-h

    ];



    extraIncludeDirs = lib.optional (with stdenvNoCC.hostPlatform; isPower && is32bit && isBigEndian) ["ppc"];