AaronBallman wrote:

> > There is weak consensus to add `stdcountof.h` which supplies a `countof` 
> > macro. However, there's no changes to the standard which add one (yet), so 
> > I figured that can be done in a follow-up.
> 
> Then I'd really like a feature. We already have a bunch, It makes sense to 
> add one for that imo
> 
> ```
> include/clang/Basic/Features.def:FEATURE(c_alignas, LangOpts.C11)
> include/clang/Basic/Features.def:FEATURE(c_alignof, LangOpts.C11)
> include/clang/Basic/Features.def:FEATURE(c_atomic, LangOpts.C11)
> include/clang/Basic/Features.def:FEATURE(c_generic_selections, LangOpts.C11)
> include/clang/Basic/Features.def:FEATURE(c_static_assert, LangOpts.C11)
> include/clang/Basic/Features.def:FEATURE(c_thread_local, LangOpts.C11 
> &&PP.getTargetInfo().isTLSSupported())
> include/clang/Basic/Features.def:FEATURE(c_fixed_enum, LangOpts.C23)
> ```

So you want this to be a `FEATURE` in C2y and an `EXTENSION` in older language 
modes? And when we get the `countof` macro in a few months, this becomes 
unnecessary?

https://github.com/llvm/llvm-project/pull/133125
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