svenvh added a comment.

> @svenvh I remember that we have also discussed the addition of a vendor 
> specific header where such feature/extension macro definition can be added to 
> avoid the macro pollution but I feel this is somewhat orthogonal i.e. the 
> fine grained control of macro defines is still needed?

Unfortunately I don't remember the details of that discussion, but I agree that 
it's worth looking into a solution for issue #55674, using e.g. `__undef` 
macros as you described above.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D137652/new/

https://reviews.llvm.org/D137652

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