<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/81178>81178</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [openmp] CMake fails with default configuration: Some (but not all) targets in this export set were already defined
        </td>
    </tr>

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

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

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

<pre>
    Hi!

I'm trying to build openmp following the instructions. Simply running:

```
cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ ..
```
This gives:

```
CMake Error at /usr/lib/llvm-19/lib/cmake/llvm/LLVMExports.cmake:37 (message):
  Some (but not all) targets in this export set were already defined.

 Targets Defined: omp
  
  Targets not yet defined: ...

Call Stack (most recent call first):
 /usr/lib/llvm-19/cmake/LLVMConfig.cmake:376 (include)
 libomptarget/cmake/Modules/LibomptargetGetDependencies.cmake:27 (find_package)
  libomptarget/CMakeLists.txt:37 (include)
```

This is happening on trunk, having preinstalled the latest snapshot. Am I missing some package to be installed?
</pre>
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