RESOLVED FIXED304415
Use NO_UNIQUE_ADDRESS macro instead of [[no_unique_address]] attribute 
https://bugs.webkit.org/show_bug.cgi?id=304415
Summary Use NO_UNIQUE_ADDRESS macro instead of [[no_unique_address]] attribute
Brandon
Reported 2025-12-18 08:54:19 PST
Windows builds with clang-cl fail to recognize [[no_unique_address]] even when compiling with C++23. WebKit already has a NO_UNIQUE_ADDRESS macro in Compiler.h that properly detects compiler support for this attribute and falls back to empty definition when unavailable. Replace direct use of [[no_unique_address]] with the NO_UNIQUE_ADDRESS macro in RefCounted base classes to fix Windows builds while maintaining the attribute on platforms that support it.
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Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2025-12-18 08:54:25 PST
<rdar://problem/166795977>
Brandon
Comment 2 2025-12-18 08:55:39 PST
Pull request: https://github.com/WebKit/WebKit/pull/55633
EWS
Comment 3 2025-12-18 11:24:28 PST
Committed 304697@main (62df643698ea): <https://commits.webkit.org/304697@main> Reviewed commits have been landed. Closing PR #55633 and removing active labels.
ryosei.otaka
Comment 4 2025-12-18 22:12:59 PST
*** Bug 304411 has been marked as a duplicate of this bug. ***
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