You may want to contact "jhb": head/base/README says:

QUOTE
# $FreeBSD$

How to cross build initial toolchain

Example with sparc64

1/ install a cross toolchain
pkg install sparc64-xtoolchain-gcc

2/ cross build world
make CROSS_TOOLCHAIN=sparc64-gcc TARGET=sparc64 TARGET_ARCH=sparc64 buildworld

3/ install the world in a sysroot
make CROSS_TOOLCHAIN=sparc64-gcc TARGET=sparc64 TARGET_ARCH=sparc64 
installworld DESTDIR=/sysroots/sparc64

4/ build the required port
$ cd base/binutils
make CROSS_TOOLCHAIN=sparc64-gcc CROSS_SYSROOT=/sysroots/sparc64 package

$ cd base/gcc
make CROSS_TOOLCHAIN=sparc64-gcc CROSS_SYSROOT=/sysroots/sparc64 package

the package are in base/gcc/work/pkg/*.txz and base/binutils/work/pkg/*.txz

To add a plist for a new binutils target
$ cd base/binutils
make CROSS_TOOLCHAIN=sparc64-gcc CROSS_SYSROOT=/sysroots/sparc64 makeplist > 
pkg-plist

edit the pkg-plist and remove everything which base does not provide via the
elftoolchain
END QUOTE

Note the "DESTDIR=/sysroots/sparc64" and the
"CROSS_SYSROOT=/sysroots/sparc64" in the example.

Are there consequences for this for what you are
proposing to do?


I do this sort of thing targetting powerpc64
at times.

I also sometimes build pkg at times this way
for powerpc64 to bootstrap it.



===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)

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