<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/101028>101028</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            LIBC_NAMESPACE contains illegal characters in -rc build
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          vient
      </td>
    </tr>
</table>

<pre>
    https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0-rc1/cmake/Modules/LLVMVersion.cmake
+
https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0-rc1/libc/CMakeLists.txt#L47
results in `#define LIBC_NAMESPACE __llvm_libc_19_1_0_-rc1` which is illegal
</pre>
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