[PATCH] D54630: Move detection of libc++ include dirs to Driver on MacOS

[Eric Fiselier via Phabricator via cfe-commits]

EricWF added a comment.

My two cents:

I needed something like this when trying to automatically detect if libc++ supported things like sized deallocation, so I would like to see this change go through.
(My understanding was that libc++ added a `__libcpp_version` file for just this reason, but it's hard to detect because the include path computation is done after we initialize the language options)


Repository:
  rC Clang

https://reviews.llvm.org/D54630