[PATCH] D26044: Factor out libc++ version file to allow Clang to more easily sniff for the installed version

[Eric Fiselier via cfe-commits]

EricWF added a comment.

@rsmith I would really like to avoid the cost of an additional include in `<__config>`. Would something like https://reviews.llvm.org/D26062 work instead?


Repository:
  rL LLVM

https://reviews.llvm.org/D26044