git: 157802238b5a - main - Add UPDATING note about running make delete-old after libc++ 18 upgrade

The branch main has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=157802238b5aa7722aff40317fe6d05f5c975d71

commit 157802238b5aa7722aff40317fe6d05f5c975d71
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-09-05 19:55:44 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-09-05 19:58:51 +0000

    Add UPDATING note about running make delete-old after libc++ 18 upgrade
    
    PR:             279692
    MFC after:      3 days
---
 UPDATING | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/UPDATING b/UPDATING
index cffafdb5d247..1aae85df0a70 100644
--- a/UPDATING
+++ b/UPDATING
@@ -55,6 +55,13 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 15.x IS SLOW:
 	own packages.  If you use pkgbase, you should install the relevant
 	packages: FreeBSD-cron, FreeBSD-lp, or FreeBSD-ntp.
 
+20240406:
+	Clang, llvm, lld, lldb, compiler-rt, libc++, libunwind and openmp have
+	been upgraded to 18.1.6. It is important that you run `make delete-old`
+	as described in the COMMON ITEMS section, otherwise several libc++
+	headers that are obsolete and need to be removed can cause compilation
+	errors in C++ programs.
+
 20240205:
 	For dynamically linked programs, system calls are now made from
 	libsys rather than libc.  No change in linkage is required as