ldionne added a comment.

In https://reviews.llvm.org/D49774#1175543, @BillyONeal wrote:

> In https://reviews.llvm.org/D49774#1175131, @mclow.lists wrote:
>
> > Another problem (that Eric and I discussed last night) is that filesystem 
> > is part of C++17, and `file_clock` is C++20. So we need a solution for 
> > C++17 as well.
>
>
> It seems like we need to fix C++20 to allow that to be a typedef to a type in 
> std::filesystem or that will be ABI breaking for MSVC++. IMO we should fix 
> the spec to allow that rather than make libc++ jump through insane hoops.


We could also just provide `file_clock` "early" in C++17. Strictly speaking 
that may make our implementation non-conforming, but IDK how big of a deal this 
would be?


Repository:
  rCXX libc++

https://reviews.llvm.org/D49774



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