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      <base href="https://bugs.webkit.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - AX: Build with isolated tree enable is broken since r284075"
   href="https://bugs.webkit.org/show_bug.cgi?id=231667">231667</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>AX: Build with isolated tree enable is broken since r284075
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Accessibility
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>cgarcia@igalia.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>achristensen@apple.com, andresg_22@apple.com, cdumez@apple.com, webkit-bug-importer@group.apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>It happens at least with GCC:

In file included from WebCore/DerivedSources/unified-sources/UnifiedSource-aba958d6-7.cpp:8:
../../Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.cpp: In member function ‘void WebCore::AXIsolatedObject::initializeAttributeData(WebCore::AXCoreObject&, bool)’:
../../Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.cpp:415:64: error: cannot convert ‘uint64_t’ {aka ‘long unsigned int’} to ‘WebCore::AXPropertyValueVariant&&’ {aka ‘std::variant<std::nullptr_t, WTF::String, bool, int, unsigned int, double, float, long unsigned int, WebCore::Color, WTF::URL, WebCore::LayoutRect, WebCore::FloatRect, long unsigned int, WebCore::IntPoint, WTF::OptionSet<WebCore::SpeakAs>, std::pair<unsigned int, unsigned int>, WTF::Vector<WebCore::AccessibilityText, 0, WTF::CrashOnOverflow, 16, WTF::FastMalloc>, WTF::Vector<long unsigned int, 0, WTF::CrashOnOverflow, 16, WTF::FastMalloc>, WTF::Vector<std::pair<long unsigned int, long unsigned int>, 0, WTF::CrashOnOverflow, 16, WTF::FastMalloc>, WTF::Vector<WTF::String, 0, WTF::CrashOnOverflow, 16, WTF::FastMalloc>, WebCore::Path>&&’}
  415 |         setProperty(AXPropertyName::SessionID, object.sessionID());
      |                                                ~~~~~~~~~~~~~~~~^~
      |                                                                |
      |                                                                uint64_t {aka long unsigned int}
In file included from ../../Source/WebCore/accessibility/atspi/AccessibilityObjectComponentAtspi.cpp:24,
                 from WebCore/DerivedSources/unified-sources/UnifiedSource-aba958d6-7.cpp:6:
../../Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.h:77:38: note:   initializing argument 2 of ‘void WebCore::AXIsolatedObject::setProperty(WebCore::AXPropertyName, WebCore::AXPropertyValueVariant&&, bool)’
   77 |     void setProperty(AXPropertyName, AXPropertyValueVariant&&, bool shouldRemove = false);
      |                                      ^~~~~~~~~~~~~~~~~~~~~~~~
In file included from WebCore/DerivedSources/unified-sources/UnifiedSource-aba958d6-7.cpp:8:
../../Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.cpp: In member function ‘void WebCore::AXIsolatedObject::setObjectProperty(WebCore::AXPropertyName, WebCore::AXCoreObject*)’:
../../Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.cpp:469:51: error: cannot convert ‘WebCore::AXID’ {aka ‘long unsigned int’} to ‘WebCore::AXPropertyValueVariant&&’ {aka ‘std::variant<std::nullptr_t, WTF::String, bool, int, unsigned int, double, float, long unsigned int, WebCore::Color, WTF::URL, WebCore::LayoutRect, WebCore::FloatRect, long unsigned int, WebCore::IntPoint, WTF::OptionSet<WebCore::SpeakAs>, std::pair<unsigned int, unsigned int>, WTF::Vector<WebCore::AccessibilityText, 0, WTF::CrashOnOverflow, 16, WTF::FastMalloc>, WTF::Vector<long unsigned int, 0, WTF::CrashOnOverflow, 16, WTF::FastMalloc>, WTF::Vector<std::pair<long unsigned int, long unsigned int>, 0, WTF::CrashOnOverflow, 16, WTF::FastMalloc>, WTF::Vector<WTF::String, 0, WTF::CrashOnOverflow, 16, WTF::FastMalloc>, WebCore::Path>&&’}
  469 |         setProperty(propertyName, object->objectID());
      |                                   ~~~~~~~~~~~~~~~~^~
      |                                                   |
      |                                                   WebCore::AXID {aka long unsigned int}
In file included from ../../Source/WebCore/accessibility/atspi/AccessibilityObjectComponentAtspi.cpp:24,
                 from WebCore/DerivedSources/unified-sources/UnifiedSource-aba958d6-7.cpp:6:
../../Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.h:77:38: note:   initializing argument 2 of ‘void WebCore::AXIsolatedObject::setProperty(WebCore::AXPropertyName, WebCore::AXPropertyValueVariant&&, bool)’
   77 |     void setProperty(AXPropertyName, AXPropertyValueVariant&&, bool shouldRemove = false);
      |                                      ^~~~~~~~~~~~~~~~~~~~~~~~

The problem seems to be that AXPropertyValueVariant contains the same type twice (in 64 bit systems) AXID (size_t -> long unsigned int) and uint64_t -> long unsigned int. That's actuallt allowed but makes the access ambiguous. Since uint64_t is only used for SessionID, I think we can explicitly use SessionID instead.</pre>
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