<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/107188>107188</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            run-clang-tidy can't actually run clang-tidy on headers
        </td>
    </tr>

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

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

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

<pre>
    I noticed that when running
`_./llvmInstall/bin/run-clang-tidy -clang-tidy-binary=./llvmInstall/bin/clang-tidy -header-filter=.* test.cpp test.hpp `
test.hpp will not be checked

after analyzing run-clang-tidy a little, you can notice the following code:
```
# Load the database and extract all files.
database = json.load(open(os.path.join(build_path, db_path)))
files = set(
[make_absolute(entry["file"], entry["directory"]) for entry in database]
)
...
for name in files:
  if file_name_re.search(name):
      task_queue.put(name)
```
that is, the script runs the task only on files from the database. in my case these files only contain cpp (maybe this is not always the case, I don't know the details of using compile_commands.json)
</pre>
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