From: Than McIntosh <thanm@google.com>
Date: Fri, 26 May 2023 14:10:01 +0000 (-0400)
Subject: doc: add release note on dead global map variable deletion
X-Git-Tag: go1.21rc1~212
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=13be9fa7f896b876775f964e167cdd44166438eb;p=gostls13.git

doc: add release note on dead global map variable deletion

Add a short release note blurb on linker dead-coding of global map
variables.

Updates #58645.

Change-Id: Ibfdd3e2b2b78517db4245b1d7eedd5e75a643b47
Reviewed-on: https://go-review.googlesource.com/c/go/+/498575
Reviewed-by: Eli Bendersky <eliben@google.com>
TryBot-Bypass: Than McIntosh <thanm@google.com>
---

diff --git a/doc/go1.21.html b/doc/go1.21.html
index 373be6c686..0bf89fe212 100644
--- a/doc/go1.21.html
+++ b/doc/go1.21.html
@@ -190,9 +190,11 @@ Do not send CLs removing the interior tags from such phrases.
 </p>
 <!-- CL 463395 -->
 <p>
-  <!-- cmd/link: linker portion of dead map removal -->
+  In Go 1.21 the linker (with help from the compiler) is now capable of
+  deleting dead (unreferenced) global map variables, if the number of
+  entries in the variable initializer is sufficiently large, and if the
+  initializer expressions are side-effect free.
 </p>
-
 <p>
   TODO: complete this section, or delete if not needed
 </p>