git: 6b147f693b91 - stable/13 - Add UPDATING note about running make delete-old after libc++ 18 upgrade

The branch stable/13 has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=6b147f693b91f16db7ba6193611f6f4d2ed762a5

commit 6b147f693b91f16db7ba6193611f6f4d2ed762a5
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-09-05 19:55:44 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-09-08 07:51:37 +0000

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

diff --git a/UPDATING b/UPDATING
index 75f04569de82..6331b1bb0da8 100644
--- a/UPDATING
+++ b/UPDATING
@@ -12,6 +12,13 @@ Items affecting the ports and packages system can be found in
 /usr/ports/UPDATING.  Please read that file before updating system packages
 and/or ports.
 
+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