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

This article provides a shell script by Brandon Azad for building XNU version 4570.1.46, which corresponds to macOS High Sierra 10.13. The script downloads the necessary source code from Apple's open-source repository, installs required tools and headers, and modifies Xcode's SDK files to successfully compile the XNU kernel.

build-xnu-4570.1.46.sh This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters Show hidden characters /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"