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      <base href="https://bugs.llvm.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 - Orphaned task reduction should be allowed."
   href="https://bugs.llvm.org/show_bug.cgi?id=45117">45117</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Orphaned task reduction should be allowed.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>OpenMP
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>Linux
          </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>Clang Compiler Support
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>andrey.churbanov@intel.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=23205" name="attach_23205" title="Bug reproducer.">attachment 23205</a> <a href="attachment.cgi?id=23205&action=edit" title="Bug reproducer.">[details]</a></span>
Bug reproducer.

OpenMP specification allows task reduction to be orphaned. Issue reported by
Olivier, Stephen Lecler (SNL), and confirmed by other members of OpenMP
language committee.

Blog article link:
<a href="https://developers.redhat.com/blog/2019/03/19/whats-new-in-openmp-5-0/">https://developers.redhat.com/blog/2019/03/19/whats-new-in-openmp-5-0/</a> 

To reproduce:

$ clang -fopenmp omp_task_red_orphaned.c
omp_task_red_orphaned.c:14:35: error: in_reduction variable must appear in a
task_reduction clause
  #pragma omp task in_reduction(+:r) firstprivate(i, th_gen)
                                  ^
omp_task_red_orphaned.c:19:35: error: in_reduction variable must appear in a
task_reduction clause
  #pragma omp task in_reduction(+:r) firstprivate(i, th_gen)
                                  ^
2 errors generated.


There is also corresponding bug in the runtime library prevented the test to
run to completion, the fix for which posted for review:
<a href="https://reviews.llvm.org/D75673">https://reviews.llvm.org/D75673</a>.</pre>
        </div>
      </p>


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