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<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>305791</bug_id>
          
          <creation_ts>2026-01-19 14:12:50 -0800</creation_ts>
          <short_desc>REGRESSION(305823@main): Cannot build WeakPtr API tests with Clang 18</short_desc>
          <delta_ts>2026-01-19 15:19:13 -0800</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Tools / Tests</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          <dependson>305754</dependson>
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Adrian Perez">aperez</reporter>
          <assigned_to name="Adrian Perez">aperez</assigned_to>
          <cc>webkit-bug-importer</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>2173107</commentid>
    <comment_count>0</comment_count>
    <who name="Adrian Perez">aperez</who>
    <bug_when>2026-01-19 14:12:50 -0800</bug_when>
    <thetext>There&apos;s a number of errors similar to the following:

../../../Tools/TestWebKitAPI/Tests/WTF/WeakPtr.cpp:366:17: error: alias template &apos;WeakPtr&apos; requires template arguments; argument deduction only allowed for class templates
  366 |         WeakPtr derivedWeakPtr { derived };
      |                 ^
../../../Tools/TestWebKitAPI/Tests/WTF/WeakPtr.cpp:91:22: note: template is declared here
   91 | template&lt;typename T&gt; using WeakPtr = WTF::WeakPtr&lt;T, WeakPtrImplWithCounter&gt;;
      |                      ^

We can add the template parameter explicitly to get those to build. The issue seems to be with the local WeakPtr type alias, which is declared with “using”.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2173108</commentid>
    <comment_count>1</comment_count>
    <who name="Adrian Perez">aperez</who>
    <bug_when>2026-01-19 14:16:23 -0800</bug_when>
    <thetext>Pull request: https://github.com/WebKit/WebKit/pull/56854</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2173125</commentid>
    <comment_count>2</comment_count>
    <who name="EWS">ews-feeder</who>
    <bug_when>2026-01-19 15:18:46 -0800</bug_when>
    <thetext>Committed 305836@main (553115957809): &lt;https://commits.webkit.org/305836@main&gt;

Reviewed commits have been landed. Closing PR #56854 and removing active labels.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2173126</commentid>
    <comment_count>3</comment_count>
    <who name="Radar WebKit Bug Importer">webkit-bug-importer</who>
    <bug_when>2026-01-19 15:19:13 -0800</bug_when>
    <thetext>&lt;rdar://problem/168466137&gt;</thetext>
  </long_desc>
      
      

    </bug>

</bugzilla>