<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 - Cherry-pick 76fc35752d19ac605c1c1fd757af9c7c3bb4a906 to release/12.x"
   href="https://bugs.llvm.org/show_bug.cgi?id=50758">50758</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Cherry-pick 76fc35752d19ac605c1c1fd757af9c7c3bb4a906 to release/12.x
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libc++
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>12.0
          </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>All Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>ldionne@apple.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
          </td>
        </tr>

        <tr>
          <th>Blocks</th>
          <td>49317
          </td>
        </tr></table>
      <p>
        <div>
        <pre>That is:

    [libc++] Make feature-test macros consistent with availability macros

    Before this patch, feature-test macros didn't take special availability
    markup into account, which means that feature-test macros can sometimes
    appear to "lie". For example, if you compile in C++20 mode and target
    macOS 10.13, the __cpp_lib_filesystem feature-test macro will be provided
    even though the <filesystem> declarations are marked as unavailable.
    This patch fixes that.

    rdar://68142369

    Differential Revision: <a href="https://reviews.llvm.org/D94983">https://reviews.llvm.org/D94983</a></pre>
        </div>
      </p>

        <div id="referenced">
          <hr style="border: 1px dashed #969696">
          <b>Referenced Bugs:</b>
          <ul>
              <li>
                [<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [meta] 12.0.1 Release Blockers"
   href="https://bugs.llvm.org/show_bug.cgi?id=49317">Bug 49317</a>] [meta] 12.0.1 Release Blockers
              </li>
          </ul>
        </div>
        <br>

      <hr>
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      <ul>
          <li>You are on the CC list for the bug.</li>
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