<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/150985>150985</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Build fails on Mac M4: LLDB test suite requires libc++ but it is disabled
        </td>
    </tr>

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

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          steven-studio
      </td>
    </tr>
</table>

<pre>
    **Environment**
- Mac M4
- macOS version: [請填]
- LLVM commit: [請填，如有]

**Build Command**
```bash
cmake -G "Unix Makefiles" -DLLVM_ENABLE_PROJECTS="clang;lld;lldb" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=./install ../llvm
```

**Observed error**
```bash
CMake Error at /Users/youzhewei/Desktop/llvm-project/lldb/test/CMakeLists.txt:201 (message):
  LLDB test suite requires libc++, but it is currently disabled.  Please add
  `libcxx` to `LLVM_ENABLE_RUNTIMES` or disable tests via
  `LLDB_INCLUDE_TESTS=OFF.
```

**Expectation**
CMake should configure successfully, or at least document proper flags for Mac M4 builds with lldb enabled.

**Steps tried**
        •     Re-checked cmake flags
        •     No explicit disabling of libcxx

**Thanks!**
</pre>
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