Isn't there some C11 version of the language that would add those kinds of features ? I guess they might break earlier C code though, but I'm not sure.
These really aren't the features you'd add in a language version though honestly. Maybe the standard library, but even then these are so simple that IMO it's not worth adding them. For a lot of these, a big reason they're not in the language is because they work if you understand what they're doing, but they don't work in every context and you get strange errors in those cases.
Ex. ARRAY_SIZE works by simply using 'sizeof' to find the size of the array. This only works if the array was defined earlier in the same section of code though, it doesn't work on say, arrays passed to functions. So the name 'ARRAY_SIZE' for this macro is misleading because it only works on some arrays in some instances. Anybody who's programmed in C would know this, but they could probably write their own macro to do this anyway. It's beginners who wouldn't know how to write this macro, and would also be confused by how it works.
The thing you might consider standardizing is the GNU extensions that they used in this article, naming ({ }) and typeof. Both can be handy honestly, but C11 doesn't standardize either IIRC.
I'm pretty sure Clang supports C11 well too, didn't find a corresponding table though. It says "By default, Clang builds C code in GNU C11 mode [...]" on this page: http://clang.llvm.org/compatibility.html.
“Clang strives to both conform to current language standards (up to C11 and C++11)”. If anything's missing, it's a bug. clang also kindly defaults to C11 so I don't have to curse and go add a command line flag every time I write “for (int i = ...”.
