<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - __atomic_is_lock_free incompatible with GCC"
   href="https://bugs.llvm.org/show_bug.cgi?id=32064">32064</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>__atomic_is_lock_free incompatible with GCC
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

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

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

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>C++
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>t.p.northover@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The pre-C11 function, __atomic_is_lock_free takes a second argument that
determines the alignment of the type/value in some way.

GCC appears to do this by looking at the value and libstdc++ passes "(void
*)-alignof(Type)". Clang, however, looks at the alignment of the pointee type
("void" in this case).

This results in a real libcall, which may not actually be available (I think).
Either way, it's not what GCC does.</pre>
        </div>
      </p>


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