[libc++] Remove obsolete _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF

[ldionne]

I don't know if that macro was ever truly defined by Clang, however it's not anymore, so that is effectively dead code.

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Louis Dionne (ldionne)

Changes

I don't know if that macro was ever truly defined by Clang, however it's not anymore, so that is effectively dead code.

---

Full diff: https://github.com/llvm/llvm-project/pull/112745.diff

1 Files Affected:

• (modified) libcxx/include/__memory/addressof.h (+2-4)

diff --git a/libcxx/include/__memory/addressof.h b/libcxx/include/__memory/addressof.h
index ecb68e0fe61e42..98b08958a6a93e 100644
--- a/libcxx/include/__memory/addressof.h
+++ b/libcxx/include/__memory/addressof.h
@@ -23,11 +23,9 @@ inline _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_NO_CFI _LIBCPP_HIDE_FROM_ABI _Tp* a
   return __builtin_addressof(__x);
 }
 
-#if _LIBCPP_HAS_OBJC_ARC && !defined(_LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF)
+#if _LIBCPP_HAS_OBJC_ARC
 // Objective-C++ Automatic Reference Counting uses qualified pointers
-// that require special addressof() signatures. When
-// _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF is defined, the compiler
-// itself is providing these definitions. Otherwise, we provide them.
+// that require special addressof() signatures.
 template <class _Tp>
 inline _LIBCPP_HIDE_FROM_ABI __strong _Tp* addressof(__strong _Tp& __x) _NOEXCEPT {
   return &__x;