[PATCH] D39888: [lsan] Only use VM_MEMORY_OS_ALLOC_ONCE on Darwin versions that support it

[Dean Michael Berris via Phabricator via llvm-commits]

dberris added a comment.

If I understand correctly, the check should happen at CMake configuration time, so that lsan doesn't even build for versions of OS X that aren't even supported.


https://reviews.llvm.org/D39888