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    <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 - c11: Rejects well-formed program qualifying incomplete object type with _Atomic qualifier."
   href="https://bugs.llvm.org/show_bug.cgi?id=40171">40171</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>c11: Rejects well-formed program qualifying incomplete object type with _Atomic qualifier.
          </td>
        </tr>

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

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

        <tr>
          <th>Component</th>
          <td>-New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>anders.granlund.0@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Test case (prog.c):

  int main()
  {
    _Atomic struct S *p;
  }

Compilation command line:

  clang prog.c -Wall -Wextra -std=c11 -pedantic-errors

Observed behaviour:

  The following error message was outputed:

    prog.c:3:5: error: _Atomic cannot be applied to incomplete type 'struct S' 
        _Atomic struct S *p;
        ^
    prog.c:3:20: note: forward declaration of 'struct S'
        _Atomic struct S *p;
                       ^
    1 error generated.

Expected behaviour:

  No error messages outputed.

  I cannot find anything in the standard forbidding qualifying incomplete
object
  types with the _Atomic qualifier. 

Note:

  GCC accepts the program without outputing any error messages.</pre>
        </div>
      </p>


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