<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/126350>126350</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clangd] [modules] adding module imports requires rebuild
        </td>
    </tr>

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

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

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

<pre>
    Example project: https://github.com/hhhapz/openJuice/tree/cmake

Recently, I added support for cmake for a project being worked on by a friend of mine. Once I got the CMakeLists.txt file finally working, support from clangd still seems limited. One of the biggest road blockers I ran into was that any time I imported a new module, I would need to rerun `cmake --build build` (Likely some simpler command would also be sufficient, but this is what I tried and it worked) in order for clangd to properly recognize it. This wasn't needed when removing the statement.

Here is an example, if I newly add the import line for Entity, I would get this error until I would run `cmake --build build` for it to regenerate caches/the sort. 


This should be reproducible with the repository link I posted above. Let me know if this is known to not be supported or if there is way to get this working.

Here's the versions of my tools:
```
$ clang++ --version
clang version 19.1.7
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

$ cmake --version
cmake version 3.31.5
```
</pre>
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