From 683e4e9caba5fda32f9ae14473a0fe612c3f783c Mon Sep 17 00:00:00 2001
From: Ken Matsui <07softy_bride@icloud.com>
Date: Fri, 11 Mar 2022 07:51:25 -0500
Subject: AppleClang: Add C++20 and C++23 flags

Follow up commit 886e27062b (Clang/MSVC: C++20 final flag, C++23
support, 2021-05-29, v3.20.4~7^2) with support for AppleClang.
---
 Modules/Compiler/AppleClang-CXX.cmake | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Modules/Compiler/AppleClang-CXX.cmake b/Modules/Compiler/AppleClang-CXX.cmake
index 28be1df..7c97969 100644
--- a/Modules/Compiler/AppleClang-CXX.cmake
+++ b/Modules/Compiler/AppleClang-CXX.cmake
@@ -47,9 +47,17 @@ if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
     set(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT ON)
 endif()
 
-if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.0)
+if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 13.0)
+  set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "-std=c++20")
+  set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++20")
+elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.0)
   set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "-std=c++2a")
   set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++2a")
 endif()
 
+if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 13.0)
+  set(CMAKE_CXX23_STANDARD_COMPILE_OPTION "-std=c++2b")
+  set(CMAKE_CXX23_EXTENSION_COMPILE_OPTION "-std=gnu++2b")
+endif()
+
 __compiler_check_default_language_standard(CXX 4.0 98)
-- 
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