<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/62985>62985</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            False positive clang-analyzer-cplusplus.NewDelete for QWeakPointer when using `-isystem` flags
        </td>
    </tr>

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

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

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

<pre>
    For the following example code, run the clang-tidy as `clang-tidy foo.cpp  -- -isystem /usr/include/qt/QtCore/ -I/usr/include/qt/` (Suppose the qt5 headers installed at /usr/include/qt)

```C++
#include <QWeakPointer>

void test(const QWeakPointer<QObject>& p)
{
        QWeakPointer<QObject> t;
        t = p;
}
```

The following warning generated
```
1 warning generated.
/usr/include/qt/QtCore/qsharedpointer_impl.h:159:50: warning: Use of memory after it is freed [clang-analyzer-cplusplus.NewDelete]
        inline void operator delete(void *ptr) { ::operator delete(ptr); }
 ^
```

It's strange when using `-I` instead of `-isystem`, it won't report this problem, which is expected (Even using -header-filter=.*).

It can be reproduce on Windows platform too.
</pre>
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