<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/83633>83633</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            -flang-experimental-polymorphism breaks OpenMPI build
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          jdenny-ornl
      </td>
    </tr>
</table>

<pre>
    I am building [OpenMPI 5.0.2](https://www.open-mpi.org/software/) using Clang and Flang.  The build started failing at 325f51237252, which enabled `-flang-experimental-polymorphism` by default.  The build was successful at the previous commit.

This is my build procedure for OpenMPI:

```
$ mkdir build && cd build
$ CC=clang CXX=clang++ FC=flang-new \
  CFLAGS="-O3" CXXFLAGS="-O3" FCFLAGS="-O3" \
 ../configure --prefix=$PWD/../install \
    --without-knem --without-ucx --enable-pretty-print-stacktrace \
    --enable-orterun-prefix-by-default --enable-mpi1-compatibility
$ make -j
$ make install
```

The error at 325f51237252 is:

```
error: loc("/home/jdenny/openmpi-5.0.2/build/ompi/mpi/fortran/use-mpi-f08/profile/paccumulate_f08.F90":30:4): /home/jdenny/llvm/flang/lib/Lower/ConvertCall.cpp:2409: not yet implemented: assumed type actual argument
```

I'm not aware of any use of assumed types in the associated code, but my fortran experience is limited, so please advise if I misunderstood something.
</pre>
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