I am generally against the idea of language support for meta-programming, even using C macros or C++ templates.
I do a lot of meta-programming/codegen with external tooling.
That's not an answer. There's a reason why you can't do it in C, and the reason is "the stdlib is poorly designed". No amount of linting can get you around that.
A new modern C standard library would be a very good thing. But I am ok writing my own, tailored for my own needs and style.