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    <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 - leading c-style comments mangle preprocessor macro formatting (output does not compile)"
   href="https://bugs.llvm.org/show_bug.cgi?id=43861">43861</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>leading c-style comments mangle preprocessor macro formatting (output does not compile)
          </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>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>Formatter
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>cole.hoosier@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>djasper@google.com, klimek@google.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=22754" name="attach_22754" title="unformatted source">attachment 22754</a> <a href="attachment.cgi?id=22754&action=edit" title="unformatted source">[details]</a></span>
unformatted source

The reformatted output fails to compile if a C-style comment exists prior to
the '#' on a line that defines a preprocessor macro.

<a href="https://godbolt.org/z/Bg2D_P">https://godbolt.org/z/Bg2D_P</a> demonstrates this if you right-click the source
window and choose "Format text".


/* A leading comment */ #define FOO (3)

int main()
{
    return FOO;    
}


becomes


/* A leading comment */ #define FOO(3)

    int main() {
  return FOO;
}</pre>
        </div>
      </p>


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