kelbon wrote:

> this needs an RFC to be posted to Discourse so the community is aware of the 
> potential new language extension

I will create it soon

> I'm not certain it's a particularly good name in terms of standardization as 
> there's no way for users to distinguish between define and define2.

I think this should be determined during the discussion, another possible name 
is `define_recursive` (but its not requireid to be recursive..)

> Unless other implementations also implement the same extension, a significant 
> number of folks wind up needing to use preprocessor conditionals to skip the 
> new feature and write fallback code so their macros remain portable

Yes, thats problem, every extension even not in preprocessor have same 
problems, but I think there are many projects now which use only clang and if 
people like the idea possibly it will be gcc extension too

> It's also worth noting that you can write recursive macros in C

As far as I know, the maximum that can be done is to code-generate many very 
difficult-to-understand constructs that allow you to repeat your code up to N 
times, creating the illusion of recursion and I would like to fix it

https://github.com/llvm/llvm-project/pull/65851
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