<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 - False positive warning on out param"
   href="https://bugs.llvm.org/show_bug.cgi?id=50379">50379</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>False positive warning on out param
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>Linux
          </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>-New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>alonzakai@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>$ cat a.cpp
void foo(int& x) {
  x = 10;
}

int main() {
  int x;
  foo(x);
  return x;
}

$ clang++ a.cpp -W
a.cpp:1:15: warning: parameter 'x' set but not used
[-Wunused-but-set-parameter]
void foo(int& x) {
              ^
1 warning generated.


It is technically true that x is set but not used, but it is an out param, so
that is a natural way to use it, and I don't think it should warn?

This changed in the last few days, based on it starting to break on our CI
today.</pre>
        </div>
      </p>


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