<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/61854>61854</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            libstdc++ version must be at least 7.1 (CheckCompilerVersion)
        </td>
    </tr>

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

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

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

<pre>
    Start appear:
```
CMake Error at cmake/modules/CheckCompilerVersion.cmake:88 (message):
  libstdc++ version must be at least 7.1.
Call Stack (most recent call first):
 cmake/config-ix.cmake:15 (include)
  CMakeLists.txt:848 (include)
```
for llvmorg-16.0.0
or 5.1. for llvmorg-15.0.0
-DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=True nothing helps
I call :
`cmake -DCMAKE_CXX_COMPILER=clang-16 -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind" -DCMAKE_BUILD_TYPE=Release -G Ninja ../llvm -DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=True`


</pre>
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