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

[Rainer Orth via Phabricator via llvm-commits]

ro added a comment.

To establish a baseline for an eventual patch along my previous outline, I tried to build llvm trunk on Darwin 11 and 17 with gcc 5 resp. 7.  The experience
was so bad (cf. PR 35280) that I'm giving up on this.  I'll try to go the -DCAN_SANITIZE_LEAKS route via a gcc-local patch to unbreak bootstrap there.


https://reviews.llvm.org/D39888