../../../WebCore/dom/XMLDocumentParserQt.cpp: In function ‘void WebCore::handleElementNamespaces(WebCore::Element*, const QXmlStreamNamespaceDeclarations&, WebCore::ExceptionCode&, WebCore::FragmentScriptingPermission)’: ../../../WebCore/dom/XMLDocumentParserQt.cpp:328: warning: ‘namespaceQName.WebCore::String::m_impl.WTF::RefPtr<WebCore::StringImpl>::m_ptr’ may be used uninitialized in this function WebCore/dom/XMLDocumentParserQt.cpp:328: String namespaceQName = decl.prefix().isEmpty() ? String("xmlns") : String("xmlns:") + String(decl.prefix());
It was fixed around http://trac.webkit.org/changeset/65040 .