<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/124049>124049</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Fortran test with many self-referencing types takes "forever" to compile with -g
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            regression,
            debuginfo,
            flang
      </td>
    </tr>

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

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

<pre>
    Test: https://github.com/fujitsu/compiler-test-suite/blob/main/Fortran/0394/0394_0031.f90

This test used to compile quickly (less than 2 min), even with -g, but now takes "forever" to compile. (I waited for more than 20 min, then killed compilation.)

`flang -c 0394_0031.f90` compiles quickly.
`flang -c -g 0394_0031.f90` compiles "forever"

Compiler used:
```
$ flang --version
flang version 20.0.0git (https://github.com/llvm/llvm-project.git 630177ccdde44b0dd8faa13b34002d15c4b0af8d)
Target: x86_64-unknown-linux-gnu
```

It was pointed out to me that this slow-down may be related to https://github.com/llvm/llvm-project/pull/122770
</pre>
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