[all-commits] [llvm/llvm-project] 49e5a8: [libc++] Fix build on macOS older than 10.15.

[Marek Kurdej via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 49e5a896d1fc0d18263da5f832b125176a4338ae
      https://github.com/llvm/llvm-project/commit/49e5a896d1fc0d18263da5f832b125176a4338ae
  Author: Marek Kurdej <marek.kurdej+llvm.org at gmail.com>
  Date:   2021-04-02 (Fri, 02 Apr 2021)

  Changed paths:
    M libcxx/include/__config

  Log Message:
  -----------
  [libc++] Fix build on macOS older than 10.15.

* This was introduced in D99515 that added -Wundef flag. CI run on macOS 10.15 and this problem wasn't caught before.