From a000912f39108dfe5fc1ce91fbe47905c797b396 Mon Sep 17 00:00:00 2001
From: Andrew Kaster <andrew@ladybird.org>
Date: Mon, 14 Apr 2025 16:10:26 -0600
Subject: [PATCH] AK: Add macro to switch between no_unique_address attribute
 forms

Also add an escape hatch for completely disabling the annotation.
---
 AK/Platform.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/AK/Platform.h b/AK/Platform.h
index ad719cbf160..cc72d7d5058 100644
--- a/AK/Platform.h
+++ b/AK/Platform.h
@@ -247,6 +247,19 @@
 #    define DISALLOW(message) __attribute__((error(message)))
 #endif
 
+#ifdef NO_UNIQUE_ADDRESS
+#    undef NO_UNIQUE_ADDRESS
+#endif
+#if defined(AK_DISABLE_NO_UNIQUE_ADDRESS)
+#    define NO_UNIQUE_ADDRESS
+#else
+#    if defined(AK_OS_WINDOWS)
+#        define NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
+#    else
+#        define NO_UNIQUE_ADDRESS [[no_unique_address]]
+#    endif
+#endif
+
 // GCC doesn't have __has_feature but clang does
 #ifndef __has_feature
 #    define __has_feature(...) 0