<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/60125>60125</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            llvm15.x configuration failed with `LIBCXX_ABI_NAMESPACE must be a reserved identifier, got ''.`
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

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

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

<pre>
    
```
cmake -G Ninja -Wno-dev -DCMAKE_BUILD_TYPE=Release -DLLVM_BINUTILS_INCDIR=/usr/include -DLLVM_ENABLE_BINDINGS=False -DLLVM_ENABLE_PROJECTS=clang;clang-tools-extra;compiler-rt;cross-project-tests;libc;libclc;libcxx;libcxxabi;libunwind;lld;lldb;mlir;openmp;polly;pstl -DOPENMP_ENABLE_LIBOMPTARGET=False -DPYTHON_EXECUTABLE=/usr/bin/python3.8 -DLLVM_CCACHE_BUILD=True -DLLVM_PARALLEL_LINK_JOBS=15 /var/jenkins/workspace/e-on_llvm-builder_release_llvm15/llvm_src/llvm

-- Using libc++abi testing configuration: /var/jenkins/workspace/e-on_llvm-builder_release_llvm15/llvm_src/libcxxabi/test/lit.site.cfg.in
-- Using libc++ testing configuration: /var/jenkins/workspace/e-on_llvm-builder_release_llvm15/llvm_src/libcxx/test/configs/legacy.cfg.in
CMake Error at /var/jenkins/workspace/e-on_llvm-builder_release_llvm15/llvm_src/libcxx/CMakeLists.txt:181 (message):
  LIBCXX_ABI_NAMESPACE must be a reserved identifier, got ''.
```
</pre>
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