From ef47e18ad0fab68f67b95c777c1bee96fe7a4785 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 7 Oct 2021 11:37:59 -0400
Subject: MSVC: Tolerate cxx_std_23 feature on older compiler versions

In commit 3aaf1d91bf (MSVC: C++20 final flag, C++23 support, 2021-05-29,
v3.20.4~7^2~1) we forgot to add `cxx_std_23` to the fallback table for
MSVC versions from VS 2010 through VS 2015.  This allows project to at
least attempt compilation with these compilers since they do not have
any modes.

Issue: #22729
---
 Modules/Compiler/MSVC-CXX.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Modules/Compiler/MSVC-CXX.cmake b/Modules/Compiler/MSVC-CXX.cmake
index f1c7450fad..5df5c1ebf0 100644
--- a/Modules/Compiler/MSVC-CXX.cmake
+++ b/Modules/Compiler/MSVC-CXX.cmake
@@ -70,6 +70,7 @@ elseif (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.0)
       cxx_std_14
       cxx_std_17
       cxx_std_20
+      cxx_std_23
       )
     _record_compiler_features(CXX "" CMAKE_CXX_COMPILE_FEATURES)
   endmacro()
-- 
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