Reinstalling from the latest snapshot is highly preferable to doing a source upgrade! You have been warned!

I'm still in the middle of writing this, don't follow these instructions yet! – Bdragon28 2020-01-08 02:12:58 UTC

Ensure xtoolchain-llvm90 is installed.

Do an initial world build as a cross compile, and force a gcc 4.2.1-compatible bootstrap (Use the GPL DTC, and use prebuilt tblgen files to avoid building any C++11 code during bootstrap.)

make CROSS_TOOLCHAIN=llvm90 TARGET=powerpc TARGET_ARCH=powerpc64 \
WITHOUT_BOOT=yes WITHOUT_LIB32=yes \
LLVM_TBLGEN=/usr/local/llvm90/bin/llvm-tblgen \
CLANG_TBLGEN=/usr/local/llvm90/bin/clang-tblgen \
WITH_GPL_DTC=yes \
WITHOUT_GOOGLETEST=yes \
XCFLAGS="-mabi=elfv2 -mcmodel=medium --sysroot=/usr/obj/usr/src/powerpc.powerpc64/tmp/" \
XCXXFLAGS="-mabi=elfv2 -mcmodel=medium --sysroot=/usr/obj/usr/src/powerpc.powerpc64/tmp/" \
buildworld buildkernel KERNCONF=GENERIC64 -j32

Note: Build is currently failing still.

make installkernel KERNCONF=GENERIC64

reboot

At this point, you are on a post-flag-day compatible kernel which can execute post-flag-day ELFv2 binaries (This is necessary because of the auxv change.)

DO NOT INSTALL THIS WORLD DIRECTLY! Make will crash during install and leave the system in a broken state!

Prepare a bootable partition of some sort and do a temporary installworld to it.

newfs /dev/nda1p5
mount /dev/nda1p5 /mnt/newtarget
cp -a /etc /mnt/newtarget
make installkernel installworld DESTDIR=/mnt/newtarget

Reboot into the temporary volume somehow. (override vfs.root.mountfrom, etc.)

Use the temporary volume to install to your normal volume.

mkdir /mnt/target
mount (normal root device) /mnt/target
rmdir /usr/src
rmdir /usr/obj
ln -s /mnt/target/usr/src /usr/src
ln -s /mnt/target/usr/obj /usr/obj
cd /usr/src
make installworld DESTDIR=/mnt/target

At this point, you are in a cross elfv2 world. Rebuild the world and kernel natively.

make buildworld buildkernel KERNCONF=GENERIC64 WITHOUT_SYSTEM_COMPILER=yes WITHOUT_SYSTEM_LINKER=yes -j32

make installkernel

reboot again into final kernel

make installworld

The table bellow sumarizes status of the hard dependencies for the flag day and duplicates information found on other sections of this document. All items on this table must have status “accepted” or “commited” for the flagday be declared.

Packages are not yet being built for this configuration; for now, you will have to build your own. Expect to find failures as unlike the results with gcc, few ports have really been tested.

Use of the -CURRENT powerpc packages built on FreeBSD.org may or may not work (it has not been tested as of 20200108).

There is a more detailed ports summary native-built on an IBM Power8 machine (ppcdevref) on loan to us by OSU.

This list of patch is for reference only. Efforts are now being focused on LLVM9

List of currently known pending issues. This list assumes above patches are already applied.

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