<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - -Wdeprecated-declarations warns about "usage" with uniform initialization"
   href="https://bugs.llvm.org/show_bug.cgi?id=45170">45170</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>-Wdeprecated-declarations warns about "usage" with uniform initialization
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>9.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>C++
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>bugzilla.llvm@me.benboeckel.net
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>This code:

```
struct S {
    int a;
    __attribute__((deprecated)) int b;
    int c;
};

S f() {
    return S{1, 2, 3};
}
```

triggers this warning with Fedora's clang-9.0.1:

```
% clang++ -c deprecated_member.cxx                                             
                                                                               
                                                              -
deprecated_member.cxx:8:17: warning: 'b' is deprecated
[-Wdeprecated-declarations]
    return S{1, 2, 3};
                ^
deprecated_member.cxx:3:20: note: 'b' has been explicitly marked deprecated
here
    __attribute__((deprecated)) int b;
                   ^
deprecated_member.cxx:1:8: warning: 'b' is deprecated
[-Wdeprecated-declarations]
struct S {
       ^
deprecated_member.cxx:8:12: note: in implicit move constructor for 'S' first
required here
    return S{1, 2, 3};
           ^
deprecated_member.cxx:3:20: note: 'b' has been explicitly marked deprecated
here
    __attribute__((deprecated)) int b;
                   ^
2 warnings generated.
```

This is a false positive because, due to the lack of designated initializers,
in order to initialize `c` here, I *must* initialize `b`. The warning should
only show up on the explicit use of `b`, not on its presence in the
initialization list. This also happens with `S s = {1, 2, 3};`.

Real world code is hitting this with the PyObject's deprecated `tp_print`
member in Python 3.9.

May be related to <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - __attribute__((deprecated)) doesn't appear for implicit construction of rvalues [-Wdeprecated-declarations]"
   href="show_bug.cgi?id=25472">Bug #25472</a>?</pre>
        </div>
      </p>


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