<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/68895>68895</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Clang][OpenMP] Building clang with openmp runtime as a cmake subproject fails
        </td>
    </tr>

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

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

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

<pre>
    I would like to build clang as part of a cmake project. In my main `CMakeLists.txt`, I add:

```
include(FetchContent)
FetchContent_Declare(
 llvm-project
  GIT_REPOSITORY https://github.com/llvm/llvm-project.git
 GIT_TAG llvmorg-17.0.2
  GIT_SHALLOW TRUE
  GIT_PROGRESS TRUE
 SOURCE_SUBDIR llvm
)
FetchContent_MakeAvailable(llvm-project)
```
I then send the following flags to my project, that are then passed down to LLVM:
```
"LLVM_ENABLE_PROJECTS": "clang;openmp"
```

Everything works.

Now, I change the flags to:

```
"LLVM_ENABLE_PROJECTS": "clang"
"LLVM_ENABLE_RUNTIMES" : "openmp"
```

I get the following error:
```
The dependency target "clang" of target "check-openmp" does not exist.
```

This is on an Apple Silicon Mac. A similar issue has been reported here by others, but left unanswered:
[https://discourse.llvm.org/t/dependency-errors-when-building-as-subdirectory/72830](url)

For context, the use case is to do the following in one project:
1. Build clang with OpenMP.
2. Build my code with that clang.

It works, but only when openmp is specified as a project, but not as a runtime.

</pre>
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