std=gnu++2a
C++ ObjC++
-Conform to the ISO 2020(?) C++ draft standard with GNU extensions (experimental and incomplete support).
+Conform to the ISO 2020 C++ draft standard with GNU extensions (experimental and incomplete support).
+
+std=gnu++20
+C++ ObjC++ Alias(std=gnu++2a)
+Conform to the ISO 2020 C++ draft standard with GNU extensions (experimental and incomplete support).
std=gnu11
C ObjC