Makefile: add a small blurb about building with gcc xtoolchain

The key details are to install the appropriate flavor of devel/freebsd-gcc9
and pass CROSS_TOOLCHAIN while building.

Suggested by:	kib
This commit is contained in:
Kyle Evans 2020-10-16 15:16:23 +00:00
parent d00afbaea9
commit 5f2aaba453
Notes: svn2git 2020-12-20 02:59:44 +00:00
svn path=/head/; revision=366766

View File

@ -89,6 +89,15 @@
# 10. `reboot'
# 11. `make delete-old-libs' (in case no 3rd party program uses them anymore)
#
# For individuals wanting to build from source with GCC from ports, first build
# or install an appropriate flavor of devel/freebsd-gcc9. The packages produced
# by this port are named "${TARGET_ARCH}-gcc9" -- note that not all
# architectures supported by FreeBSD have an external gcc toolchain available.
#
# Once the appropriate freebsd-gcc package is installed, simply pass
# CROSS_TOOLCHAIN=${TARGET_ARCH}-gcc9 while building with the above steps,
# e.g., `make buildworld CROSS_TOOLCHAIN=amd64-gcc9`.
#
# See src/UPDATING `COMMON ITEMS' for more complete information.
#
# If TARGET=machine (e.g. powerpc, arm64, ...) is specified you can