<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 - -Wc++-compat should warn on implicit conversions from int to enum"
   href="https://bugs.llvm.org/show_bug.cgi?id=37679">37679</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>-Wc++-compat should warn on implicit conversions from int to enum
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>trunk
          </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>Frontend
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>tobias@grosser.es
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>```
$cat /tmp/test.c 
enum ENUM {
        ENUM_A,
        ENUM_B,
};

enum ENUM foo() {
        int x;
        enum ENUM e;

        e = x; // should warn
        x = e; // no warning
        return x; // should warn
}

enum ENUM bar() {
        return ENUM_A; // no warning
}
```

gcc warns here when using `-Wc++-compat`.

$gcc -Wc++-compat /tmp/test.c -c
/tmp/test.c: In function ‘foo’:
/tmp/test.c:10:4: warning: enum conversion in assignment is invalid in C++
[-Wc++-compat]
  e = x; // should warn
    ^
/tmp/test.c:12:9: warning: enum conversion in return is invalid in C++
[-Wc++-compat]
  return x; // should warn
         ^

clang does not warn, but should.</pre>
        </div>
      </p>


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