<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/112038>112038</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang-tidy] -line-filter only works with windows path separators on Windows
        </td>
    </tr>

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

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

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

<pre>
    Hi,

I'm on Windows and trying to use the `-line-filter`-argument to clang-tidy. This only worked on paths without folders (`myfile.cpp`). To ensure unique file names in the filter, I wanted to use paths with folders (instead of `myfile.cpp` use `src/subfolder/myfile.cpp`. I saw in the source that `endswith` is used on the file name (which I assume is a relative or absolute file path).

https://github.com/llvm/llvm-project/blob/58d97034c9c149d175c66440d31f46e9dfd4b760/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp#L468

I got it to work by using windows path separators (that had to be escaped), i.e. `src\\subfolder\\myfile.cpp` instead of `src/subfolder/myfile.cpp`. (even when using MINGW64/Git bash that is included in Git for Windows, this solution is neccessary)

`-line-filter='[{"name":"subfolder\\myfile.cpp","lines":[[10,35]]}]'`

This is a problem because I want to use `clang-tidy-diff.py`, ideally without having to modify this file/source code and manually convert to windows path separators.

The example usage of `clang-tidy-diff.py` is with git diff, which outputs unix path separators `/`.
</pre>
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