From 6561b032bc995a248bc065690f0af6d98288ecea Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 28 Oct 2021 12:18:42 -0400
Subject: MSVC: Tolerate c_std_17 and c_std_23 features on older compiler
 versions

MSVC `cl` versions prior to 19.27 had no `-std:c*` flags for C
standards.  List the `c_std_{17,23}` features anyway.  This allows
projects to at least attempt compilation with these compilers since they
do not have any modes.
---
 Modules/Compiler/MSVC-C.cmake | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Modules/Compiler/MSVC-C.cmake b/Modules/Compiler/MSVC-C.cmake
index aca7995..8da0ced 100644
--- a/Modules/Compiler/MSVC-C.cmake
+++ b/Modules/Compiler/MSVC-C.cmake
@@ -49,6 +49,8 @@ else()
       c_std_90
       c_std_99
       c_std_11
+      c_std_17
+      c_std_23
       c_function_prototypes
       )
     list(APPEND CMAKE_C90_COMPILE_FEATURES c_std_90 c_function_prototypes)
-- 
cgit v0.12