commit 968bc01aee341d76748480701764b2fba0689112 (HEAD -> consteval, evan/consteval)
Author: Evan Klitzke <evan@eklitzke.org>
Date:   Thu Oct 7 17:47:25 2021 -0700

    Add consteval and constinit keywords (introduced in C++20)

diff --git a/lisp/progmodes/cc-langs.el b/lisp/progmodes/cc-langs.el
index 53f6206a82..8e68f044e8 100644
--- a/lisp/progmodes/cc-langs.el
+++ b/lisp/progmodes/cc-langs.el
@@ -2590,8 +2590,8 @@ c-modifier-kwds
   t    nil
   (c c++) '("extern" "inline" "register" "static")
   c    (append '("auto") (c-lang-const c-modifier-kwds))
-  c++  (append '("constexpr" "explicit" "friend" "mutable" "template"
-		 "thread_local" "virtual")
+  c++  (append '("consteval" "constexpr" "constinit" "explicit"
+		 "friend" "mutable" "template" "thread_local" "virtual")
 	       ;; "using" is now handled specially (2020-09-14).
 	       (c-lang-const c-modifier-kwds))
   objc '("auto" "bycopy" "byref" "extern" "in" "inout" "oneway" "out" "static")