# A script to build XNU version 4570.1.46 (macOS High Sierra 10.13).

> Source: <https://gist.github.com/bazad/654959120a423b226dc564073b435453>
> Published: 2017-10-06 21:24:22+00:00

build-xnu-4570.1.46.sh

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#! /bin/bash

#

# build-xnu-4570.1.46.sh

# Brandon Azad

#

# A script showing how to build XNU version 4570.1.46 on MacOS High Sierra

# 10.13 with Xcode 9.

#

# Note: This process will OVERWRITE files in Xcode's MacOSX10.13.sdk. Make a

# backup of this directory first!

#

# Set the working directory.

WORKDIR="${WORKDIR:-build-xnu-4570.1.46}"

# Set a permissive umask just in case.

umask 022

# Print commands and exit on failure.

set -ex

# Get the SDK path and toolchain path.

SDKPATH="$(xcrun --sdk macosx --show-sdk-path)"

TOOLCHAINPATH="$(xcode-select -p)/Toolchains/XcodeDefault.xctoolchain"

[ -d "${SDKPATH}" ] && [ -d "${TOOLCHAINPATH}" ]

# Create the working directory.

mkdir "${WORKDIR}"

cd "${WORKDIR}"

# Back up the SDK if that option is given.

if [ -n "${BACKUP_SDK}" ]; then

	sudo ditto "${SDKPATH}" "$(basename "${SDKPATH}")"

fi

# Download XNU and some additional sources we will need to help build.

curl https://opensource.apple.com/tarballs/xnu/xnu-4570.1.46.tar.gz | tar -xf-

curl https://opensource.apple.com/tarballs/dtrace/dtrace-262.tar.gz | tar -xf-

curl https://opensource.apple.com/tarballs/AvailabilityVersions/AvailabilityVersions-32.tar.gz | tar -xf-

curl https://opensource.apple.com/tarballs/libplatform/libplatform-161.tar.gz | tar -xf-

curl https://opensource.apple.com/tarballs/libdispatch/libdispatch-913.1.6.tar.gz | tar -xf-

# Build and install ctf utilities. This adds the ctf tools to

# ${TOOLCHAINPATH}/usr/local/bin.

cd dtrace-262

mkdir -p obj dst sym

xcodebuild install -target ctfconvert -target ctfdump -target ctfmerge ARCHS="x86_64" SRCROOT="${PWD}" OBJROOT="${PWD}/obj" SYMROOT="${PWD}/sym" DSTROOT="${PWD}/dst"

# TODO: Get the XcodeDefault.toolchain path programmatically.

sudo ditto "${PWD}/dst/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain" "${TOOLCHAINPATH}"

cd ..

# Install AvailabilityVersions. This writes to ${SDKPATH}/usr/local/libexec.

cd AvailabilityVersions-32

mkdir -p dst

make install SRCROOT="${PWD}" DSTROOT="${PWD}/dst"

sudo ditto "${PWD}/dst/usr/local" "${SDKPATH}/usr/local"

cd ..

# Install the XNU headers we'll need for libdispatch. This OVERWRITES files in

# MacOSX10.13.sdk!

cd xnu-4570.1.46

mkdir -p BUILD.hdrs/obj BUILD.hdrs/sym BUILD.hdrs/dst

make installhdrs SDKROOT=macosx ARCH_CONFIGS=X86_64 SRCROOT="${PWD}" OBJROOT="${PWD}/BUILD.hdrs/obj" SYMROOT="${PWD}/BUILD.hdrs/sym" DSTROOT="${PWD}/BUILD.hdrs/dst"

# HACK: The subsequent build command fails with a missing file error. We create

# that file so that the build continues.

touch libsyscall/os/thread_self_restrict.h

xcodebuild installhdrs -project libsyscall/Libsyscall.xcodeproj -sdk macosx ARCHS="x86_64 i386" SRCROOT="${PWD}/libsyscall" OBJROOT="${PWD}/BUILD.hdrs/obj" SYMROOT="${PWD}/BUILD.hdrs/sym" DSTROOT="${PWD}/BUILD.hdrs/dst"

# Set permissions correctly before dittoing over MacOSX10.13.sdk.

sudo chown -R root:wheel BUILD.hdrs/dst/

sudo ditto BUILD.hdrs/dst "${SDKPATH}"

cd ..

# Install libplatform headers to ${SDKPATH}/usr/local/include.

cd libplatform-161

sudo ditto "${PWD}/include" "${SDKPATH}/usr/local/include"

sudo ditto "${PWD}/private"  "${SDKPATH}/usr/local/include"

cd ..

# Build and install libdispatch's libfirehose_kernel target to

# ${SDKPATH}/usr/local.

cd libdispatch-913.1.6

mkdir -p obj sym dst

xcodebuild install -project libdispatch.xcodeproj -target libfirehose_kernel -sdk macosx ARCHS="x86_64 i386" SRCROOT="${PWD}" OBJROOT="${PWD}/obj" SYMROOT="${PWD}/sym" DSTROOT="${PWD}/dst"

sudo ditto "${PWD}/dst/usr/local" "${SDKPATH}/usr/local"

cd ..

# Build XNU.

cd xnu-4570.1.46

make SDKROOT=macosx ARCH_CONFIGS=X86_64 KERNEL_CONFIGS="RELEASE"