[PATCH] D62155: [CMake] Copy C++ headers before configuring runtimes build

[Saleem Abdulrasool via Phabricator via llvm-commits]

compnerd added a comment.

The only thing that Im worried about is cross-compilation accidentally picking up the libc++ headers that are built here (e.g. building on Linux for Linux with the host libc++ headers and building libc++ as a runtime).  The rest looks pretty much a substitution and addition of `runtime-libcxx-headers` target to the runtimes build which is fine.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D62155/new/

https://reviews.llvm.org/D62155