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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 - Enable -Wimplicit-fallthrough for C"
   href="https://bugs.llvm.org/show_bug.cgi?id=39382">39382</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Enable -Wimplicit-fallthrough for C
          </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>Linux
          </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>Frontend
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>ndesaulniers@google.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>chh@google.com, llozano@chromium.org, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk, srhines@google.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>For some reason, -Wimplicit-fallthrough doesn't do anything for C code.  It
doesn't produce a warning for being an unrecognized flag, it just doesn't print
any Diags.

Would be nice to have with:
<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Fallthrough attr should support GNU spelling __attribute__((fallthrough)) to match GCC 7"
   href="show_bug.cgi?id=37135">https://bugs.llvm.org/show_bug.cgi?id=37135</a>

<a href="https://godbolt.org/z/gV_c9_">https://godbolt.org/z/gV_c9_</a></pre>
        </div>
      </p>


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