[libcxx-commits] [compiler-rt] [libcxxabi] [libunwind] [runtimes][PAC] Harden unwinding when possible (#138571) (PR #143230)

[Anatoly Trosinenko via libcxx-commits]

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@@ -30,6 +30,45 @@ EXCEPTION_DISPOSITION _GCC_specific_handler(PEXCEPTION_RECORD, void *, PCONTEXT,
                                             _Unwind_Personality_Fn);
 #endif
 
+#if __has_feature(ptrauth_qualifier)
+#include <ptrauth.h>
+#if __has_feature(ptrauth_restricted_intptr_qualifier)
+#define __ptrauth_gcc_personality_intptr(key, addressDiscriminated,            \
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atrosinenko wrote:

I like the idea of not checking for `__has_include(<ptrauth.h>)` separately and instead gluing `#include <ptrauth.h>` unconditionally to its users, which are usually already guarded with some `__has_feature(...)` test. I wonder if this pattern can be used in more places affected by this patch.

https://github.com/llvm/llvm-project/pull/143230