<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/56583>56583</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Invalid format-security warning with empty argpack
        </td>
    </tr>

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

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

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

<pre>
    ```c++
#include <stdio.h>

template <typename... Args>
void print_error (const char* fmt, Args... args)
{
    printf (fmt, args...);
}

int main (void)
{
    print_error ("message\n");
    return 0;
}
```
Produces incorrect `-Wformat-security` error, even though `fmt` is the string literal `"message\n"`:
```
tes.cc:6:13: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
    printf (fmt, args...);
            ^~~
tes.cc:11:5: note: in instantiation of function template specialization 'print_error<>' requested here
    print_error ("message\n");
    ^
tes.cc:6:13: note: treat the string as an argument to avoid this
    printf (fmt, args...);
            ^
            "%s", 
1 warning generated.
```
No warning is emitted when print_error is given additional arguments.
</pre>
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