[PATCH] D28383: build: add a heuristic to determine the C++ ABI

[Saleem Abdulrasool via Phabricator via cfe-commits]

compnerd added a comment.

@rnk happy to add such a macro.  Would `__cpp_abi_itanium` and `__cpp_abi_microsoft` be palatable?

This actually does get encoded into `__config` albeit in a round-about way.  The `__config_site` gets concatenated with `__config` into `__generated_config` which is installed as `__config`.


Repository:
  rL LLVM

https://reviews.llvm.org/D28383