svn commit: r366766 - head

[Kyle Evans]

Author: kevans
Date: Fri Oct 16 15:16:23 2020
New Revision: 366766
URL: https://svnweb.freebsd.org/changeset/base/366766

Log:
  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

Modified:
  head/Makefile

Modified: head/Makefile
==============================================================================
--- head/Makefile	Fri Oct 16 14:28:13 2020	(r366765)
+++ head/Makefile	Fri Oct 16 15:16:23 2020	(r366766)
@@ -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