<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/119793>119793</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Clang] clang should rely on gentoo config file for stdc++ headers location
        </td>
    </tr>

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

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

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

<pre>
    There are a number of references to gentoo in https://github.com/llvm/llvm-project/blob/main/clang/lib/Driver/ToolChains/Gnu.cpp

Specifically, location of both gcc and stdc++ are detected using some magic paths, and for gcc config if a gentoo-like config file is found in `<sysroot>/etc/env.d/gcc/` it will be used for gcc configuration, which is great for people working on systems with non-standard paths.

Yet, while the configuration file also contains the location of stdc++ on gentoo, it is ignored and instead a non-standard path is also tested with a comment about "Gentoo is weird and places its headers inside the GCC install".

Instead using `STDCXX_INCDIR` from the gentoo config file that is parsed for detecting stdc++ headers location would be both cleaner, future proof (for example if gentoo decides to store stdc++ includes somewhere else the config) and would also help me greatly to direct clang to the right paths without using symlinks everywhere.


</pre>
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