[PATCH] D38567: [config] Warn when POSIX_C_SOURCE breaks threading support on Darwin

[Vedant Kumar via Phabricator via cfe-commits]

vsk abandoned this revision.
vsk added a comment.

For those following along, Alex worked out that this doesn't affect apple-clang 802. We took a closer look and found that the build break just affects clang-900, and was introduced in this r290889. The fix (r293167) didn't make it into clang-900. Adding a warning here wouldn't be the right solution, since it would be better to just cherry pick r293167.


https://reviews.llvm.org/D38567