jackoalan added a comment.

> 1. It it possible to limit the new syntax to config files only? It would 
> avoid concerns of gcc compatibility.

Yes, ultimately this use case only calls for extending config files.

> Is it possible to use more understandable designation, like `<CONFIG>` or 
> something similar?

I agree, keyword directives like this would be more flexible in the long term 
and the use of shell redirection characters would theoretically protect any 
general purpose word. For now, I think it is acceptable to consume `<CONFIG>` 
as a singular token, but in the future, generic `<(.*)>` tokenization may be 
worth adding.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D115604/new/

https://reviews.llvm.org/D115604

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