[src/trunk]: src update the latest note to talk about all 3 potential ways that

[mrg <mrg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5722e03f034a
branches:  trunk
changeset: 1013031:5722e03f034a
user:      mrg <mrg%NetBSD.org@localhost>
date:      Thu Aug 20 03:09:34 2020 +0000

description:
update the latest note to talk about all 3 potential ways that
failure can occur now (1 still upcoming.)

diffstat:

 UPDATING |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (20 lines):

diff -r 1e8894bbf577 -r 5722e03f034a UPDATING
--- a/UPDATING  Thu Aug 20 03:08:07 2020 +0000
+++ b/UPDATING  Thu Aug 20 03:09:34 2020 +0000
@@ -1,4 +1,4 @@
-$NetBSD: UPDATING,v 1.311 2020/08/12 06:48:50 mrg Exp $
+$NetBSD: UPDATING,v 1.312 2020/08/20 03:09:34 mrg Exp $
 
 This file (UPDATING) is intended to be a brief reference to recent
 changes that might cause problems in the build process, and a guide for
@@ -20,7 +20,9 @@
 ^^^^^^^^^^^^^^^
 
 20200811:
-       GCC updates may require cleaning the objdir.
+       GCC updates may require cleaning the objdir.  This may occur
+       due to GCC 7.5 update, GCC 8.4 move to gcc.old, or the upcoming
+       GCC 9 upgrade.
 
 20200614:
        blacklist* has been renamed to blocklist*. postinstall(8)