[PATCH] D101192: Add support for #elifdef and #elifndef

[Aaron Ballman via Phabricator via cfe-commits]

aaron.ballman added a comment.

In D101192#2716596 <https://reviews.llvm.org/D101192#2716596>, @mibintc wrote:

> Wow thanks for doing this! I worked on it a couple days a while ago but I abandoned the effort and went back to my day job.

Happy to help!

> It seems like preprocessing ought to be something like a "state machine" but I couldn't figure out the mechanism. Would it make sense to add some kind of high level description of the components, now that you've gone to the [presumably massive] effort of understanding it? Just a couple small comments above.

Adding some developer documentation about the preprocessor may not be a bad idea in general, but I think that's orthogonal to this patch. We do have a place to add those kind of docs and it looks like the preprocessor is largely not mentioned: https://clang.llvm.org/docs/InternalsManual.html#the-lexer-and-preprocessor-library. However, I'd prefer not to sign up to write those docs at this time.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D101192/new/

https://reviews.llvm.org/D101192