[PATCH] D34574: [Sema] Disable c++17 aligned new and delete operators if not implemented in the deployment target's c++ standard library

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith added a comment.

So the driver would pass a flag to the frontend to indicate "this target probably doesn't have aligned allocation support", and Sema would produce a warning if it selects an aligned allocation function when that flag is specified? That makes sense to me.

Should we also remove the recently-added availability attributes in libc++ too? If I'm using a recent libc++ and providing my own aligned allocation functions, we shouldn't reject attempts to call those aligned allocation functions.


https://reviews.llvm.org/D34574