[PATCH] D136712: Define _GNU_SOURCE for arm baremetal in C++ mode.

[Fangrui Song via Phabricator via cfe-commits]

MaskRay accepted this revision.
MaskRay added a comment.
This revision is now accepted and ready to land.

LG with a test nit.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D136712/new/

https://reviews.llvm.org/D136712