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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 - Standalone libc++ build is broken"
   href="https://bugs.llvm.org/show_bug.cgi?id=43049">43049</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Standalone libc++ build is broken
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </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>normal
          </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>mclow.lists@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre><a href="https://libcxx.llvm.org/docs/BuildingLibcxx.html">https://libcxx.llvm.org/docs/BuildingLibcxx.html</a> has a section that starts out:
<span class="quote">> It is sometimes beneficial to build separately from the full LLVM build. 
> An out-of-tree build would look like this:</span >

And that no longer works.

If I do this (on Mac OS)
$ cmake -G Ninja -DLLVM_PATH=$LLVM/llvm -DLIBCXX_CXX_ABI=libcxxabi
-DLIBCXX_CXX_ABI_INCLUDE_PATHS=/usr/include $LIBCXX

that works, but then
$ ninja
$ ninja check-libcxx
"ninja: error: unknown target 'check-libcxx'"

Also, running individual tests via lit fails as well:
$ $LIT -sv --param "std=c++17" --param
"libcxx_site_config=$LLVM_BUILD/libcxx/test/lit.site.cfg"
--param=enable_warnings=true $LLVM/libcxx/test/std/utilities/time/</pre>
        </div>
      </p>


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