[clang] Extension: allow recursive macros (PR #65851)

[via cfe-commits]

kelbon wrote:



> There are questions about the name, theorically this is an identifier that c and c++ committees may want to use in the future.

Yes, the name define2 is a placeholder, but the more I look at it, the more it looks appropriate

> Is this something you plan to propose to other compilers? Standardization?

I dont think standard committee will consider the proposal without reference implementation(if its not a modules ofc)) and, in case of preprocessor, usage in 'real world'

> You should also consider whether this needs extensions flags and extension warnings.
> missing unit tests

i will research how to do it in llvm



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