git: 5096328dd7cb - releng/13.4 - Add UPDATING note about running make delete-old after libc++ 18 upgrade

The branch releng/13.4 has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=5096328dd7cbe79628098f10ab92eb4ab70d5fce

commit 5096328dd7cbe79628098f10ab92eb4ab70d5fce
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-09-05 19:55:44 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-09-09 17:49:39 +0000

    Add UPDATING note about running make delete-old after libc++ 18 upgrade
    
    PR:             279692
    MFC after:      3 days
    
    (cherry picked from commit 157802238b5aa7722aff40317fe6d05f5c975d71)
    (cherry picked from commit 6b147f693b91f16db7ba6193611f6f4d2ed762a5)
    
    Approved by:    re (cperciva)
---
 UPDATING | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/UPDATING b/UPDATING
index d9e322e4a1a1..f1c2c0d8617e 100644
--- a/UPDATING
+++ b/UPDATING
@@ -26,6 +26,13 @@ and/or ports.
 
 	umtx Kernel panic or Use-After-Free [SA-24:14.umtx]
 
+20240419:
+	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.
+
 20240218:
 	MFC of 713db49d06de changed 'struct ieee80211vap' internals in net80211.
 	Given we do not have enough spares and the struct is allocated by