[PATCH] D53956: Fix test assumption that Linux implies glibc.

[Marshall Clow via Phabricator]

mclow.lists added a comment.

I hate this chunk of code. :-(
`TEST_HAS_C11_FEATURES` basically means that we can use C11 library features like `aligned_alloc`, and `timespec` etc.


Repository:
  rCXX libc++

https://reviews.llvm.org/D53956