<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/144291>144291</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Unable to switch off diagnostics for "Invalid bitwise operation between different enumeration types"
        </td>
    </tr>

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

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

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

<pre>
    I have come across an issue where certain third party header files generates the following error, when included in C++26 projects:

>/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.0.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGImage.h:96:18 Invalid bitwise operation between different enumeration types ('CGImageAlphaInfo' and 'CGImageComponentInfo')

Trying to disable diagnostics using the following pragmas does not work:

```
#pragma clang diagnostic push 
#pragma clang diagnostic ignored "-Wenum-conversion"
#include <Cocoa/Cocoa.h>
#pragma clang diagnostic pop
```

Sample test project for Xcode 26: [Test.zip](https://github.com/user-attachments/files/20749306/Test.zip)

I realise Apple uses their own custmised clang, but i'm speculating they pull most of core features/bugfixes from upstream `llvm-project`. I've also raised an issue with Apple, but I have not gotten a response. There is also a related issue https://github.com/llvm/llvm-project/issues/92340, but not sure what the outcome was for this. 

If there is a work-around to disable specific diagnostics for third-party or system headers included in C++26 projects, that would be appreciated.
</pre>
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