[src/trunk]: src Warn to clean gcc objectdirs for updated compiler.

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

details:   https://anonhg.NetBSD.org/src/rev/766b58fdb5d4
branches:  trunk
changeset: 378091:766b58fdb5d4
user:      martin <martin%NetBSD.org@localhost>
date:      Wed Jul 19 17:49:40 2023 +0000

description:
Warn to clean gcc objectdirs for updated compiler.

diffstat:

 UPDATING |  8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diffs (22 lines):

diff -r 16db825e6f33 -r 766b58fdb5d4 UPDATING
--- a/UPDATING  Wed Jul 19 15:40:38 2023 +0000
+++ b/UPDATING  Wed Jul 19 17:49:40 2023 +0000
@@ -1,4 +1,4 @@
-$NetBSD: UPDATING,v 1.341 2023/07/18 16:59:57 lukem Exp $
+$NetBSD: UPDATING,v 1.342 2023/07/19 17:49:40 martin 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
@@ -23,6 +23,12 @@ 20230718:
        build.sh will use mk.conf in the same directory as build.sh instead
        of /etc/mk.conf, unless MAKECONF is already defined in the environment.
 
+20230714:
+       Import of gcc 10.5 requires a clean build of at least tools/gcc
+       and external/gpl3/gcc* object directories. An update build
+       without cleaning will result in obscure failures in rare corner
+       cases.
+
 20230604:
        Building native kernels with the installed make(1) instead of
        the $TOOLDIR/bin/nbmake-${arch} wrapper will fail if userland