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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 - x86_64-pc-linux-gnu-g++: error: unrecognized command-line option '-Wthread-safety'"
   href="https://bugs.llvm.org/show_bug.cgi?id=51213">51213</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>x86_64-pc-linux-gnu-g++: error: unrecognized command-line option '-Wthread-safety'
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </td>
        </tr>

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

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

        <tr>
          <th>Component</th>
          <td>Core LLVM classes
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>shoober420@gmail.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=25064" name="attach_25064" title="llvm build.log">attachment 25064</a> <a href="attachment.cgi?id=25064&action=edit" title="llvm build.log">[details]</a></span>
llvm build.log

I've been encountering this build fail and same errors for a couple days now.
As of the most recent LLVM master commit
(<a href="https://github.com/llvm/llvm-project/commit/0425332015f479a89226c684c33659aa9cfff4b5">https://github.com/llvm/llvm-project/commit/0425332015f479a89226c684c33659aa9cfff4b5</a>),
build will fail on my Gentoo machine. Logs attached.</pre>
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      </p>


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