<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/145326>145326</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            `clang -print-runtime-dir` from apt.llvm.org lies (broken in 19 and 20, fine in 18 ...)
        </td>
    </tr>

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

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

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

<pre>
    Hi,

when attempting to use the `-print-runtime-dir` switch with the compiler driver, this shows a directory that doesn't exist:

```
$ stat $(clang -print-runtime-dir)
stat: cannot statx '/usr/lib/llvm-20/lib/clang/20/lib/x86_64-pc-linux-gnu': No such file or directory
```

I have versions 18, 19 and 20 installed in parallel from apt.llvm.org and iterating over these versions I get:

```
$ for((i=18;i<21;i++)); do command ls -d $(clang-$i -print-runtime-dir); done
/usr/lib/llvm-18/lib/clang/18/lib/linux
ls: cannot access '/usr/lib/llvm-19/lib/clang/19/lib/x86_64-pc-linux-gnu': No such file or directory
ls: cannot access '/usr/lib/llvm-20/lib/clang/20/lib/x86_64-pc-linux-gnu': No such file or directory
```

As you can see **it works in Clang 18!**

Corresponding `--version` output:

```
$ for((i=18;i<21;i++)); do clang-$i --version|head -n 1; done
Ubuntu clang version 18.1.8 (++20240731025043+3b5b5c1ec4a3-1~exp1~20240731145144.92)
Ubuntu clang version 19.1.7 (++20250114103332+cd708029e0b2-1~exp1~20250114103446.78)
Ubuntu clang version 20.1.7 (++20250612073421+199e02a36433-1~exp1~20250612193439.130)
```
</pre>
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