[PATCH] D56750: Implement feature test macros using a script.

[Louis Dionne via Phabricator]

ldionne added a comment.

This is nice! I do have a question: what is `TEST_GCC_VER` vs `TEST_GCC_VER_NEW`?


Repository:
  rCXX libc++

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  https://reviews.llvm.org/D56750/new/

https://reviews.llvm.org/D56750