[llvm-branch-commits] [clang] [PAC][Driver] Support ptrauth flags only on ARM64 Darwin (PR #113152)

[Anton Korobeynikov via llvm-branch-commits]

asl wrote:

I think we'd need to keep driver flags for `pauthtest` ABI as the intention is to enable easier bringup of pointer authentication ABI on a new target:
  - `pauthest` is intended to be used for experimenting with signing schema w/o changing compiler
  - the signing schema is explicitly encoded in the pauth elf marking

Though certainly for other *named* ABIs (say, platform dependent) they should be disabled by default and it is up to platform to decide on signing schema.

https://github.com/llvm/llvm-project/pull/113152