[core] Simplify the define of R__SIZEDDELETE

libc++ now honors the feature flag `__cpp_sized_deallocation`

Ref: llvm/llvm-project@ef804d8

Author: devajithvs

core/foundation/inc/ROOT/RConfig.hxx

@@ -341,11 +341,8 @@
 #   endif
 #endif
 
-#if defined(__GLIBCXX__) && !defined(__cpp_sized_deallocation)
-   // Sized global deallocation functions in libstc++ are only enabled if
-   // __cpp_sized_deallocation is defined, which Clang only does if explicitly
-   // passed -fsized-deallocation.
-#else
+#ifdef __cpp_sized_deallocation
+// Sized global deallocation functions are only enabled if __cpp_sized_deallocation is defined.
 #   define R__SIZEDDELETE
 #endif
 

roottest/root/meta/CMakeLists.txt

@@ -52,9 +52,16 @@ configure_file(typelist_win32.v6.cxx17.txt . COPYONLY)
 ROOTTEST_ADD_AUTOMACROS(DEPENDS ANSTmpltInt.C TmpltInt0.C TmpltInt1.C TmpltFloat.C
                                 TmpltNoSpec.C Event.cxx ${COMPILE_MACRO_TEST}
                                 EXCLUDE runMemberComments runautoload)
-ROOTTEST_ADD_TEST(runMemberComments
-                  MACRO runMemberComments.C
-                  OUTREF MemberComments${ref_suffix})
+if(APPLE)
+  # Ref file with no new operator delete(void *, size_t)
+  ROOTTEST_ADD_TEST(runMemberComments
+                    MACRO runMemberComments.C
+                    OUTREF MemberComments_macos.ref)
+elif()
+  ROOTTEST_ADD_TEST(runMemberComments
+                    MACRO runMemberComments.C
+                    OUTREF MemberComments${ref_suffix})
+endif()
 
 if(NOT MSVC OR win_broken_tests)
     ROOTTEST_ADD_TEST(drawing