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Download Xcode For Catalina 10.15

broken image


Update: I always appreciate the traffic, but the folks at MacPorts have their official installer for Catalina available now. You should use it:
https://www.macports.org/install.php
Updated on 2019/10/09 to work with the public release of Catalina.

Another year, another round of 'Oh, shit! My software doesn't run on the latest version of MacOS!' While MacOS steadily marches towards being a consumer friendly OS that alienates the hardcore users, we continue to try to beat back the tide with tools like MacPorts. I'll be curious to see how things go with future versions of MacOS, now that there are reports that upgrading to Catalina will wipe out a users /opt/ folder. Vasilis download for mac.

I'm using VMware to run macOS Catalina 10.15 beta I tried to download xcode from the appstore and it won't After that I downloaded the XCode 11.7 from the developer download, and installed it but won't work So I will download another XCode version, but Which XCode version is compatible with macOS Catalina 10.15 beta? Question: Q: Cant install xcode in catalina 10.15.4. It keeps saying 'not enough disk space'. Xcode may be an 8GB download, but its installation requires double.

Below you will find my steps for getting MacPorts compiled by hand on MacOS 10.15 Catalina. I am working on a clean install of Catalina and Xcode 11. If you are trying an upgrade, or using a different version, your experience may be different. If you run into problems post a comment and I'll do what I can to help out.

And so, without further ado…

  1. Install MacOS Catalina
  2. Install XCode 11
  3. Launch XCode
    1. Agree to the license agreement.
    2. Enter your password when the authentication dialog box opens.
    3. Wait for it to finish installing components.
    4. Quit XCode
  4. Open a terminal window.
    (CMD-Space terminal )
  5. sudo xcode-select --install
    (enter your user password)
  6. When the pop-up opens asking for permission to install the command line tools, click 'Install'.
  7. Agree to the license agreement, despite what it says will happen to your first-born.
  8. Back to your terminal window, inscribe these arcane incantations:
  9. sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
  10. sudo xcodebuild -license
    (Space through the document, and then type ‘agree' – The ghost of Steve Jobs will not start haunting you until at least New Years.)
  11. cd ~/Desktop
    (A window will pop up asking for access to your desktop folder. Grant it, lest the imps be released.)
  12. curl -O https://distfiles.macports.org/MacPorts/MacPorts-2.6.1.tar.gz
  13. tar -xzvf MacPorts-2.6.1.tar.gz
  14. cd MacPorts-2.6.1
  15. ./configure
  16. make
  17. sudo make install
    (Enter your user password if prompted. You may not be prompted if you get through the above steps quickly.)
  18. echo 'export PATH=/opt/local/bin:$PATH' >> ~/.zshrc
  19. source ~/.zshrc
  20. sudo port -v selfupdate
    (Enter your user password if prompted. You may not be prompted if you get through the above steps quickly.)

Driftland: the magic revival for mac. At this point you are pretty much ready to start installing ports. I say pretty much, because there are two ‘optional dependencies' that will make your life easier:

  1. Install Java from https://www.java.com/en/download/mac_download.jsp
  2. Install XQuartz X11 from https://www.xquartz.org/

OK, now you are really, really ready to install ports. 🙂

Stellaris: ascension pack for mac. Take your fresh Catalina install out for a spin and let us know how it goes!

If this worked for you, could I ask a favor? Share a link to this article somewhere you think people would find it useful. Thanks!

Download Xcode For Catalina 10.15

The macOS Catalina 10.15 kernel (XNU) source has been released here: source, tarball.

It has been a while since I've updated this blog, so this post will cover building XNU for all current Catalina releases 10.15 - 10.15.6. Let's start with the standard disclaimer:
Building XNU requires some patience, and some open source dependencies which are not pre-installed. This post walks through all the steps necessary to build the open source version of XNU on supported Apple hardware.


Update

If you experience panics related to Skywalk, you may need to add wlan.skywalk.enable=0 to your boot-args.


TL;DR

I have updated the makefile which automates the downloading and building of all prerequisites. The file now supports all released 10.15.x kernels, and the new default macOS version is 10.15.6. You can manually grab it like:
  • curl https://jeremya.com/sw/Makefile.xnudeps > Makefile.xnudeps
and invoke it like:
  • make -f Makefile.xnudeps
This makefile will automatically detect the correct versions of source code to download based on the version of macOS you specify. By default, the version is 10.15.6, however you can select a different version like:
  • make -f Makefile.xnudeps macos_version=10.13.1 xnudeps
You can also see other features of the Makefile using the help target.
The default target of the makefile, xnudeps,will perform all the necessary source and build/project fixups. However, if you want to re-download the source and perform the fixups, you can use the download and xnu-fixups targets.


Setup Xcode

If you have not downloaded and installed Xcode, you will first need to do a small bit of setup to be able to use the command line tools. The steps to install and setup a specific version of Xcode are as follows:
  1. Download the xip package from developer.apple.com/downloads/more. The particular version you select may depend on what version of XNU you want to compile. You will need a developer account to download Xcode this way.
  2. Unpack the xip package by double clicking on it, or using the command line:
    $ xip --expand Xcode_{ver}.xip
  3. Select the new xcode:
    $ sudo xcode-select -s path/to/Xcode.app/Contents/Developer
  4. Agree to the license:
    $ sudo xcodebuild -license
  5. Make sure it works:
    $ xcrun -sdk macosx -show-sdk-path
    $ clang -v


Manual XNU Building

All of the source for both XNU and required dependencies is available from opensource.apple.com. Each release of macOS open source code has a different set of dependencies. Please refer to the table below when downloading and building the source. The exact steps are given assuming you are building a kernel for macOS Catalina 10.15.6 - substitute different version numbers as appropriate (or use the makefile to automate the process).Unfortunately, this process does involve some code modifications to xnu to allow the build to succeed. If you are building manually, be careful to follow the instructions exactly!
Project10.1510.15.110.15.210.15.310.15.410.15.510.15.6
Xcode
(recommended)		11.0
dtrace338.0.1338.40.5338.100.1
AvailabilityVersions4545.345.545.745.945.11
libdispatch1173.0.31173.40.51173.60.11173.100.2
libplatform220220.100.1
Libsystem12811281.100.1
xnu6153.11.266153.41.36153.61.16153.81.56153.101.66153.121.16153.141.1

Here are the manual steps necessary to build XNU:
Download xcode for catalina 10.15 free
  1. Download and Install Xcdoe
    • Make sure you have at least Xcode 11 installed. You can install it via the App Store, or by manual download here: https://developer.apple.com/download/more/
    • NOTE: for older versions of macOS, you may need older versions of Xcode which are only available via download from developer.apple.com. You need a developer account to download from that site.
  2. Download the source
    • export TARBALLS=https://opensource.apple.com/tarballs
    • curl -O ${TARBALLS}/dtrace/dtrace-338.100.1.tar.gz
    • curl -O ${TARBALLS}/AvailabilityVersions/AvailabilityVersions-45.11.tar.gz
    • curl -O ${TARBALLS}/libplatform/libplatform-220.100.1.tar.gz
    • curl -O ${TARBALLS}/libdispatch/libdispatch-1173.100.2.tar.gz
    • curl -O ${TARBALLS}/xnu/xnu-6153.141.1.tar.gz
  3. Build CTF tools from dtrace
    • tar zxf dtrace-338.100.1.tar.gz
    • cd dtrace-338.100.1
    • mkdir obj sym dst
    • echo '#include ' > include/llvm-Support/DataTypes.h
    • sed -i -e 's,include 'llvm/Support/DataTypes,include 'llvm-Support/DataTypes,' include/llvm-Support/PointerLikeTypeTraits.h
    • xcodebuild install -sdk macosx -target ctfconvert
      -target ctfdump -target ctfmerge ARCHS=x86_64
      SRCROOT=$PWD OBJROOT=$PWD/obj SYMROOT=$PWD/sym DSTROOT=$PWD/dst
    • export TOOLCHAIN=`cd $(xcrun -sdk macosx -show-sdk-platform-path)/././Toolchains/XcodeDefault.xctoolchain && pwd`
    • sudo ditto $PWD/dst/$TOOLCHAIN /$TOOLCHAIN
    • cd .
  4. Install AvailabilityVersions
    • tar zxf AvailabilityVersions-45.11.tar.gz
    • cd AvailabilityVersions-45.11
    • mkdir dst
    • make install SRCROOT=$PWD DSTROOT=$PWD/dst
    • sudo ditto
      $PWD/dst/usr/local/libexec
      $(xcrun -sdk macosx -show-sdk-path)/usr/local/libexec
    • cd .
  5. Install libplatform headers
    • tar zxf libplatform-220.100.1.tar.gz
    • cd libplatform-220.100.1
    • sudo mkdir -p
      $(xcrun -sdk macosx -show-sdk-path)/usr/local/include/os/internal
    • sudo ditto $PWD/private/os/internal
      $(xcrun -sdk macosx -show-sdk-path)/usr/local/include/os/internal
    • cd .
  6. Install XNU headers
    • tar zxf xnu-6153.11.26.tar.gz
    • cd xnu-6153.11.26
    • make SDKROOT=macosx ARCH_CONFIGS=X86_64 installhdrs
    • sudo ditto $PWD/BUILD/dst $(xcrun -sdk macosx -show-sdk-path)
    • cd .
  7. Build firehose from libdispatch
    • tar zxf libdispatch-1173.100.2.tar.gz
    • cd libdispatch-1173.100.2
    • mkdir obj sym dst
    • awk '/include ' .__tmp__ && mv -f .__tmp__ xcodeconfig/libdispatch.xcconfig
    • xcodebuild install -sdk macosx -target libfirehose_kernel
      SRCROOT=$PWD OBJROOT=$PWD/obj SYMROOT=$PWD/sym DSTROOT=$PWD/dst
    • sudo ditto $PWD/dst/usr/local
      $(xcrun -sdk macosx -show-sdk-path)/usr/local
    • cd .
  8. Patch XNU Source (these steps may vary slighly between 10.15.x releases)
    • cd xnu-6153.11.26
    • sed -i -e 's/outl(cfgAdr, XeonCapID5);//; s/uint32_t cap5reg = inl(cfgDat);/uint32_t cap5reg = 0;/' osfmk/i386/cpuid.h
    • sed -i -e 's/^notsup:$//' bsd/nfs/nfs_node.c
    • awk '/^subr_prof.o_CFLAGS/ { print 'nfs_subs.o_CFLAGS_ADD += -Wno-unused-parameter'; print 'nfs_vfsops.o_CFLAGS_ADD += -Wno-unused-parameter -Wno-unused-variable'; print 'nfs_vnops.o_CFLAGS_ADD += -Wno-unused-function'; print 'if_ipsec.o_CFLAGS_ADD += -Wno-unused-function'; } { print $0 }' bsd/conf/Makefile.template > .__tmp__ && mv .__tmp__ bsd/conf/Makefile.template
    • awk '/include / { print '#include '; } { print $0 }' bsd/net/dlil.c > .__tmp__ && mv .__tmp__ bsd/net/dlil.c
    • sed -i -e 's/(if_headless_init.*)/1;void 1/' bsd/net/if_headless.c
    • sed -i -e '/if (pcb->ipsec_kpipe_count 0.*/{N;N;N;N;d;}' bsd/net/if_ipsec.c
    • sed -i -e '/nfs4_delegreturn_rpc(.*/{N;d;}' bsd/nfs/nfs_node.c
    • awk '/include / { print '#include '; } { print $0 }' bsd/net/if_bridge.c > .__tmp__ && mv .__tmp__ bsd/net/if_bridge.c
    • sed -i -e '/cwa_classifier_e wa_reqd;/d' osfmk/i386/cpuid.c
    • awk '/IOPMrootDomain.cpo_CXX/{ print 'IODMACommand.iig.cpo_CXXWARNFLAGS_ADD += -Wno-duplicate-decl-specifier'; } { print $0 }' iokit/conf/Makefile.template > .__tmp__ && mv .__tmp__ iokit/conf/Makefile.template
    • echo -e '_pmap_in_ppln_pmap_free_reserved_ppl_pagen_pmap_claim_reserved_ppl_page' >> config/Private.exports
    • cd .
  9. Build XNU (checkout the README.md for more options!)
    • cd xnu-6153.11.26
    • make SDKROOT=macosx ARCH_CONFIGS=X86_64 KERNEL_CONFIGS=RELEASE
    • cd .

Check out the README.md file at the top of the XNU source tree for more options to the build system. Some common and useful options include: KERNEL_CONFIGS=DEVELOPMENT, BUILD_LTO=0 and LOGCOLORS=y.

Install and Run XNU

SECURITY WARNING: You need to disable System Integrity Protection and set the machine'sSecure Boot security setting to 'No Security' in order to install and run a custom kernel.
After the final build step, you should have a new kernel built in {xnu}/BUILD/obj/kernel.In order to run this kernel, you will need to install it, and rebuild the prelinkedkernel image. Installing a kernel could potentially render your system un-bootable, so trying this out in a VM first is recommended.
WARNING: In macOS Catalina the root partition is mounted read-only. In order to mount it read-write, you will need to first disable SIP, then remount using:
sudo mount -uw /
This will only succeed if you have first disabled SIP.
In order to successfully link the macOS Catalina open source kernel, you will also need to build and install the System.kext.
  • # make a backup copy of the existing System.kext!
  • sudo ditto /System/Library/Extensions/System.kext ~/System.kext.backup
  • cd xnu-6153.11.26
  • make SDKROOT=macosx KERNEL_CONFIGS=RELEASE
    DSTROOT=$PWD/BUILD.syskext
    install_config
  • sudo chown -R root:wheel BUILD.syskext
  • sudo ditto BUILD.syskext/ /
  • cd .

To install and run your kernel:
  • cd xnu-6153.11.26
  • sudo ditto $PWD/BUILD/obj/kernel /System/Library/Kernels/kernel
  • sudo kextcache -v -invalidate /
    / locked; waiting for lock.
    Lock acquired; proceeding
    ..
  • sudo reboot
    ..
  • uname -a

If you build a different variant of XNU, you may need to ditto a different kernel name, e.g., kernel.development instead of just kernel

Download Xcode For Catalina 10.15 Full

.
Note that you can select different prelinkedkernel variants from which to boot using the kcsuffix boot-arg.For example, if you built a development kernel (using KERNEL_CONFIGS=DEVELOPMENT in the make invocation), you would install and run it like so:
How

The macOS Catalina 10.15 kernel (XNU) source has been released here: source, tarball.

It has been a while since I've updated this blog, so this post will cover building XNU for all current Catalina releases 10.15 - 10.15.6. Let's start with the standard disclaimer:
Building XNU requires some patience, and some open source dependencies which are not pre-installed. This post walks through all the steps necessary to build the open source version of XNU on supported Apple hardware.


Update

If you experience panics related to Skywalk, you may need to add wlan.skywalk.enable=0 to your boot-args.


TL;DR

I have updated the makefile which automates the downloading and building of all prerequisites. The file now supports all released 10.15.x kernels, and the new default macOS version is 10.15.6. You can manually grab it like:
  • curl https://jeremya.com/sw/Makefile.xnudeps > Makefile.xnudeps
and invoke it like:
  • make -f Makefile.xnudeps
This makefile will automatically detect the correct versions of source code to download based on the version of macOS you specify. By default, the version is 10.15.6, however you can select a different version like:
  • make -f Makefile.xnudeps macos_version=10.13.1 xnudeps
You can also see other features of the Makefile using the help target.
The default target of the makefile, xnudeps,will perform all the necessary source and build/project fixups. However, if you want to re-download the source and perform the fixups, you can use the download and xnu-fixups targets.


Setup Xcode

If you have not downloaded and installed Xcode, you will first need to do a small bit of setup to be able to use the command line tools. The steps to install and setup a specific version of Xcode are as follows:
  1. Download the xip package from developer.apple.com/downloads/more. The particular version you select may depend on what version of XNU you want to compile. You will need a developer account to download Xcode this way.
  2. Unpack the xip package by double clicking on it, or using the command line:
    $ xip --expand Xcode_{ver}.xip
  3. Select the new xcode:
    $ sudo xcode-select -s path/to/Xcode.app/Contents/Developer
  4. Agree to the license:
    $ sudo xcodebuild -license
  5. Make sure it works:
    $ xcrun -sdk macosx -show-sdk-path
    $ clang -v


Manual XNU Building

All of the source for both XNU and required dependencies is available from opensource.apple.com. Each release of macOS open source code has a different set of dependencies. Please refer to the table below when downloading and building the source. The exact steps are given assuming you are building a kernel for macOS Catalina 10.15.6 - substitute different version numbers as appropriate (or use the makefile to automate the process).Unfortunately, this process does involve some code modifications to xnu to allow the build to succeed. If you are building manually, be careful to follow the instructions exactly!
Project10.1510.15.110.15.210.15.310.15.410.15.510.15.6
Xcode
(recommended)		11.0
dtrace338.0.1338.40.5338.100.1
AvailabilityVersions4545.345.545.745.945.11
libdispatch1173.0.31173.40.51173.60.11173.100.2
libplatform220220.100.1
Libsystem12811281.100.1
xnu6153.11.266153.41.36153.61.16153.81.56153.101.66153.121.16153.141.1

Here are the manual steps necessary to build XNU:
  1. Download and Install Xcdoe
    • Make sure you have at least Xcode 11 installed. You can install it via the App Store, or by manual download here: https://developer.apple.com/download/more/
    • NOTE: for older versions of macOS, you may need older versions of Xcode which are only available via download from developer.apple.com. You need a developer account to download from that site.
  2. Download the source
    • export TARBALLS=https://opensource.apple.com/tarballs
    • curl -O ${TARBALLS}/dtrace/dtrace-338.100.1.tar.gz
    • curl -O ${TARBALLS}/AvailabilityVersions/AvailabilityVersions-45.11.tar.gz
    • curl -O ${TARBALLS}/libplatform/libplatform-220.100.1.tar.gz
    • curl -O ${TARBALLS}/libdispatch/libdispatch-1173.100.2.tar.gz
    • curl -O ${TARBALLS}/xnu/xnu-6153.141.1.tar.gz
  3. Build CTF tools from dtrace
    • tar zxf dtrace-338.100.1.tar.gz
    • cd dtrace-338.100.1
    • mkdir obj sym dst
    • echo '#include ' > include/llvm-Support/DataTypes.h
    • sed -i -e 's,include 'llvm/Support/DataTypes,include 'llvm-Support/DataTypes,' include/llvm-Support/PointerLikeTypeTraits.h
    • xcodebuild install -sdk macosx -target ctfconvert
      -target ctfdump -target ctfmerge ARCHS=x86_64
      SRCROOT=$PWD OBJROOT=$PWD/obj SYMROOT=$PWD/sym DSTROOT=$PWD/dst
    • export TOOLCHAIN=`cd $(xcrun -sdk macosx -show-sdk-platform-path)/././Toolchains/XcodeDefault.xctoolchain && pwd`
    • sudo ditto $PWD/dst/$TOOLCHAIN /$TOOLCHAIN
    • cd .
  4. Install AvailabilityVersions
    • tar zxf AvailabilityVersions-45.11.tar.gz
    • cd AvailabilityVersions-45.11
    • mkdir dst
    • make install SRCROOT=$PWD DSTROOT=$PWD/dst
    • sudo ditto
      $PWD/dst/usr/local/libexec
      $(xcrun -sdk macosx -show-sdk-path)/usr/local/libexec
    • cd .
  5. Install libplatform headers
    • tar zxf libplatform-220.100.1.tar.gz
    • cd libplatform-220.100.1
    • sudo mkdir -p
      $(xcrun -sdk macosx -show-sdk-path)/usr/local/include/os/internal
    • sudo ditto $PWD/private/os/internal
      $(xcrun -sdk macosx -show-sdk-path)/usr/local/include/os/internal
    • cd .
  6. Install XNU headers
    • tar zxf xnu-6153.11.26.tar.gz
    • cd xnu-6153.11.26
    • make SDKROOT=macosx ARCH_CONFIGS=X86_64 installhdrs
    • sudo ditto $PWD/BUILD/dst $(xcrun -sdk macosx -show-sdk-path)
    • cd .
  7. Build firehose from libdispatch
    • tar zxf libdispatch-1173.100.2.tar.gz
    • cd libdispatch-1173.100.2
    • mkdir obj sym dst
    • awk '/include ' .__tmp__ && mv -f .__tmp__ xcodeconfig/libdispatch.xcconfig
    • xcodebuild install -sdk macosx -target libfirehose_kernel
      SRCROOT=$PWD OBJROOT=$PWD/obj SYMROOT=$PWD/sym DSTROOT=$PWD/dst
    • sudo ditto $PWD/dst/usr/local
      $(xcrun -sdk macosx -show-sdk-path)/usr/local
    • cd .
  8. Patch XNU Source (these steps may vary slighly between 10.15.x releases)
    • cd xnu-6153.11.26
    • sed -i -e 's/outl(cfgAdr, XeonCapID5);//; s/uint32_t cap5reg = inl(cfgDat);/uint32_t cap5reg = 0;/' osfmk/i386/cpuid.h
    • sed -i -e 's/^notsup:$//' bsd/nfs/nfs_node.c
    • awk '/^subr_prof.o_CFLAGS/ { print 'nfs_subs.o_CFLAGS_ADD += -Wno-unused-parameter'; print 'nfs_vfsops.o_CFLAGS_ADD += -Wno-unused-parameter -Wno-unused-variable'; print 'nfs_vnops.o_CFLAGS_ADD += -Wno-unused-function'; print 'if_ipsec.o_CFLAGS_ADD += -Wno-unused-function'; } { print $0 }' bsd/conf/Makefile.template > .__tmp__ && mv .__tmp__ bsd/conf/Makefile.template
    • awk '/include / { print '#include '; } { print $0 }' bsd/net/dlil.c > .__tmp__ && mv .__tmp__ bsd/net/dlil.c
    • sed -i -e 's/(if_headless_init.*)/1;void 1/' bsd/net/if_headless.c
    • sed -i -e '/if (pcb->ipsec_kpipe_count 0.*/{N;N;N;N;d;}' bsd/net/if_ipsec.c
    • sed -i -e '/nfs4_delegreturn_rpc(.*/{N;d;}' bsd/nfs/nfs_node.c
    • awk '/include / { print '#include '; } { print $0 }' bsd/net/if_bridge.c > .__tmp__ && mv .__tmp__ bsd/net/if_bridge.c
    • sed -i -e '/cwa_classifier_e wa_reqd;/d' osfmk/i386/cpuid.c
    • awk '/IOPMrootDomain.cpo_CXX/{ print 'IODMACommand.iig.cpo_CXXWARNFLAGS_ADD += -Wno-duplicate-decl-specifier'; } { print $0 }' iokit/conf/Makefile.template > .__tmp__ && mv .__tmp__ iokit/conf/Makefile.template
    • echo -e '_pmap_in_ppln_pmap_free_reserved_ppl_pagen_pmap_claim_reserved_ppl_page' >> config/Private.exports
    • cd .
  9. Build XNU (checkout the README.md for more options!)
    • cd xnu-6153.11.26
    • make SDKROOT=macosx ARCH_CONFIGS=X86_64 KERNEL_CONFIGS=RELEASE
    • cd .

Check out the README.md file at the top of the XNU source tree for more options to the build system. Some common and useful options include: KERNEL_CONFIGS=DEVELOPMENT, BUILD_LTO=0 and LOGCOLORS=y.

Install and Run XNU

SECURITY WARNING: You need to disable System Integrity Protection and set the machine'sSecure Boot security setting to 'No Security' in order to install and run a custom kernel.
After the final build step, you should have a new kernel built in {xnu}/BUILD/obj/kernel.In order to run this kernel, you will need to install it, and rebuild the prelinkedkernel image. Installing a kernel could potentially render your system un-bootable, so trying this out in a VM first is recommended.
WARNING: In macOS Catalina the root partition is mounted read-only. In order to mount it read-write, you will need to first disable SIP, then remount using:
sudo mount -uw /
This will only succeed if you have first disabled SIP.
In order to successfully link the macOS Catalina open source kernel, you will also need to build and install the System.kext.
  • # make a backup copy of the existing System.kext!
  • sudo ditto /System/Library/Extensions/System.kext ~/System.kext.backup
  • cd xnu-6153.11.26
  • make SDKROOT=macosx KERNEL_CONFIGS=RELEASE
    DSTROOT=$PWD/BUILD.syskext
    install_config
  • sudo chown -R root:wheel BUILD.syskext
  • sudo ditto BUILD.syskext/ /
  • cd .

To install and run your kernel:
  • cd xnu-6153.11.26
  • sudo ditto $PWD/BUILD/obj/kernel /System/Library/Kernels/kernel
  • sudo kextcache -v -invalidate /
    / locked; waiting for lock.
    Lock acquired; proceeding
    ..
  • sudo reboot
    ..
  • uname -a

If you build a different variant of XNU, you may need to ditto a different kernel name, e.g., kernel.development instead of just kernel

Download Xcode For Catalina 10.15 Full

.
Note that you can select different prelinkedkernel variants from which to boot using the kcsuffix boot-arg.For example, if you built a development kernel (using KERNEL_CONFIGS=DEVELOPMENT in the make invocation), you would install and run it like so:
  • sudo ditto $PWD/BUILD/obj/kernel.development
    /System/Library/Kernels/kernel.development
  • sudo kextcache -v -invalidate /
  • sudo nvram boot-args='kcsuffix=development'
  • sudo reboot
If you have existing boot-args, you can, of course, preserve them in the nvram boot-args variable.
If you place a different kernel with a different suffix in /System/Library/Kernels

Download Xcode For Catalina 10.15 Mac

, then the kextcache utility will automatically build a prelinked kernel with that variant, and it can be selected using the kcsuffix

Download Xcode For Catalina 10.15 Free

boot-arg. For example, instead of replacing the default kernel, you could:
  • sudo ditto $PWD/BUILD/obj/kernel
    /System/Library/Kernels/kernel.test
  • sudo kextcache -v -invalidate /
  • sudo nvram boot-args='kcsuffix=test'
  • sudo reboot
It may also be useful to use the following boot-args to see serial output from the kernel as it boots:

How To Install Xcode On Catalina

  • sudo nvram boot-args='kcsuffix=development serial=3 -v




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