llvm-project

759b6377 - [clang][PAC] Fix crashes on _Atomic __ptrauth-qualified objects (#240294)

[clang][PAC] Fix crashes on _Atomic __ptrauth-qualified objects (#240294) Implicit `_Atomic` operations on a `__ptrauth`-qualified object assert in CodeGen, because the pointer-authentication helpers do not look through `AtomicType`: https://godbolt.org/z/6KE7Ez5P4 (a trunk build, so the link stops crashing once this lands). Fix the crashes. In a build without assertions the same code miscompiled an `_Atomic` function pointer under `-fptrauth-calls`, signing it twice or leaving it unsigned. Nothing else changes: the tests simply document current behavior, with a FIXME on what I propose fixing in follow-ups, for example https://godbolt.org/z/hGosq14ea. Assisted-by: AI